RISK COMMUNICATION AND THE PROTECTION OF
CHILDREN’S ENVIRONMENTAL HEALTH
Terri Damstra, Ph.D.
World Health Organization
Effective
communication on the risks of environmental hazards to children is
critical to developing intervention and prevention programs. Risk
communication is not a one-way transfer of information from the expert
to the non-expert, but an interactive process of exchange of
information and opinion among individuals, groups, and institutions.
Risk messages must be accurate, credible, and understandable. In order
for risk messages on the environmental threats to children not be
misleading, they must be evidence-based and placed in an overall
framework of priority concerns regarding children’s health. In order to
obtain a realistic perspective of the major issues related to children’s
environmental health in Pacific Basin countries, a questionnaire was
sent to participants prior to the meeting. The following tables
summarizes the responses from 34 participants representing 12 countries.
TABLE
1 |
Summary of Questionnaire Results Regarding Major Environmental
Threats
to the
Health of Children in Pacific Basin Countries |
Priority Health Concerns* |
Sources |
Agents |
1. Respiratory Diseases |
- Traffic
- Air pollution
(indoor/outdoor)
- Industry |
Particulates
Nox
Sox
Carbon Monoxide |
2. Water-borne Diseases
(diarrheal, G.I.) |
- Industry
- Inadequate sanitation |
Bacteria
Parasites |
3. Poisonings, Accidents |
- Household products
- Industry |
Pesticides
Hazardous wastes |
4. Impaired
Neurobehavioural Development |
- Industry |
Lead, mercury, dioxin,
PCBs |
*Priority order based on
percentage of responses. |
TABLE
2 |
Summary of Questionnaire Results Regarding Risk Communication of
Children’s Environmental Health (CEH)
|
Government Awareness
Policies/Regulations
Availability of Data Bases |
Mechanisms of Risk Communication* |
Barriers of Risk Communication* |
Opportunities to Improve Risk Communication* |
Excellent (10%)
Some
(55%)
None
(35%) |
1. Mass Media |
1. Lack of expertise and
resources. |
1. Increased community
awareness and concern. |
|
2. Physicians, health
professionals, educators. |
2. Lack of communication
among government sectors. |
2. International
pressures and concerns. |
|
3. Government |
3. Political/cultural
influences. |
3. Availability of
electronic means of information dissemination. |
*Priority order based on
percentage of responses. |
Mongolia surface water chemistry and its impact to human health
P.Batima, Ph.D., Institute
of Meteorology and Hydrology
The rivers
in Mongolia are originate from one of the three largest mountain ranges:
Mongol-Altai, Hangai-Huvsgul and Hentein. The rivers are divided into
three main basins, depending on its drainage system: Arctic Ocean Basin
(AOB), Pacific Ocean Basin (POB), and Internal Drainage Basin (IDB) of
Central Asia. Mongolia water resources are unequally distributed over
the country i.e. in the northern part of the country the available water
per capita is 4-5 times more than the world average while it is 10 time
less in southern part i.e. in the Gobi. Similarly water quality also has
spatial character. The chemical composition of the rivers and their
changes are related to variations in altitude and climatic conditions.
For example: the rivers flowing from the high mountains have lower
concentrations of ions, whereas the water in southern part has
relatively high amount of ions. In other word the water in northern part
of the country represent low salinity soft water while the water of the
southern part represent high salinity hard water.
The open surface water such as river, lake, spring and others are used
as a source for drinking as well as agricultural water use in rural
area. About 40 percent of the rural area use unsafe water for daily use.
Therefore evaluation of surface water chemistry in terms of human health
concern is important issue. Data present here show certain relation of
water chemistry with some diseases occurred in rural area. Therefore
this paper is aimed to discuss about circulatory and digestive and
genito urine system diseases resulted from the water use that has high
or too low contents of some dissolved salts in it. For instance: in the
Gobi region where water is much harder than any other places the
occurrence of high blood pressure per 10000 person is almost twice as
many as in other places. It is also found that digestive and genito
urine system disease increases with increased concentration of total
dissolved salts.
Key words: Calcium, magnesium, total dissolved salts, circulatory system
disease, digestive and genito urine system disease.
Aeroallergens
in Singapore - outdoor environment
Dr. Fook Tim CHEW, Department of
Paediatrics, National University of Singapore
Continuous
air sampling of the outdoor airspora environment in Singapore has been
carried out since 1990 at 3 different sites. Fungal spores were found to
be numerically dominant, comprising between 86.0-89.4% of the total
airspora which also consisted of spores of fern (6.2-8.6%) and pollen
grains (4.4-5.4%). Conidia of Cladosporium were the most abundant fungal
spore type, followed by the ascospores of Didymosphaeria, and the
conidia of Curvularia, Drechslera and Pithomyces. The predominant fern
spore present in the atmosphere was that of Nephrolepis auriculata
(making up between 50.9-55.8% of the total fern spore counts), followed
by spores of Dicranopteris linearis (24.4-27.1% of total fern spores),
Stenochlaena palustris (5.2-6.2%), Asplenium nidus (2.0-3.8%), Pteridium
aquilinum (2.8-3.6%) and Dicranopteris curranii (3.4-4.4%). With pollen
grains, pollen of Elaeis guineensis, Casuarina equisetifolia and
Kyllingia polyphylla were the most abundant (> 20% of total pollen
depending on the site). Pollen of Acacia auriculiformis, Ptycosperma
macarthuri and Podocarpus polystachyus were also found relatively
frequent (>10% of the days surveyed). Seasonal variations in the spore
or pollen densities were discernible despite the relatively uniform
tropical climate. In addition, association between spore/pollen counts
and local meteorological conditions were also analyzed and found to be
highly correlated. This study has thus identified the unique airspora
profile of the local Singapore environment. Sensitization to these
airspora has also been documented.
Regional Issues Concerning Children's Environmental Health - Singapore
Dr. Fook Tim CHEW, Department of Paediatrics,
National University of Singapore
This
presentation will look at several issues concerning children's health in
relation to the environment in Singapore. The island city state of
Singapore is notable for its modern and highly urbanized environment. To
obtain leads into issues that may affect children in Singapore, we
looked at it from the healthcare utilization perspective. The leading
causes of hospitalization for children under the age of 15 years old are
(1) accidents and injuries (accounting for 6.3% of the total), (2)
asthma (5.6%), (3) congenital anomalies (5.0%) and other perinatal
conditions (4.3%). The leading disease conditions seen in private
practitioner clinics and government are upper respiratory tract
infections (>50%) and asthma (8%). From these figures, it was noted that
asthma figured prominently as a leading cause of morbidity in Singapore
children. Our recent survey showed that at least 1 in 5 school children
has been doctor diagnosed with asthma. A substantial degree
under-recognition however still exist. Asthma has also been estimated
(conservatively) to cost approximately US$37 million per annum in a
population of 3 million. With atopy being highly associated with asthma,
we thus evaluated the indoor and outdoor aeroallergen environment in
Singapore. Dust mites were found to be highly prevalent in Singapore
homes, with Blomia tropicalis being the most prevalent. The atopic
population was found to be highly sensitized to the unique local mite
fauna. The outdoor environment was also found to be an important source
of allergens. Fungal spores were numerically dominant outdoors (86-89%
of total airspora). Additionally, a total of 34 fern spore and 83 pollen
types were also identified. Sensitization to the major pollen and spores
has been documented. We have also observed that the childhood acute
asthma exacerbation rates (documented as hospital admissions and
emergency room visits) have distinct peaks in January-February, May and
August each year. Ambient air pollutant levels may play a role in
contributing to this seasonal variation. This presentation will also
touch on the regional haze and its effects on respiratory health,
particularly in children.
Aeroallergens in Singapore - indoor environment
Dr. Fook Tim CHEW, Department of Paediatrics,
National University of Singapore
The indoor
environment of Singapore is rich sources of allergens. This presentation
summarizes the allergenic profile of this island city state which is
notable for its highly urbanized environment. We evaluated the
prevalence and distribution of indoor allergens in a cross-section of
956 dust samples obtained from homes, childcare centres, schools, and a
hospital. Additionally, we evaluated the dust mite fauna in 134 of these
dust samples from 50 homes. Our results showed that homes had
significantly higher concentrations allergens compared to the other
locations, except for the cockroach allergens, where higher mean levels
were found in schools. Within the homes, the highest concentrations of
mite allergens were found in bedroom mattresses and carpets, whilst
cockroach allergens were mainly concentrated in the storerooms and
kitchens. Animal dander allergens were well distributed and not confined
to homes with pets. Their highest levels were found in dust of soft
furnishings, which included the sofas, carpets and mattresses. There was
an absence of significant seasonal variation in dust mite allergen
levels in the homes over a one year period. From our mite isolation
studies, we found 130/134 (97%) samples infested with mites. All samples
from sofas and carpets had more than 500 mites/g compared to 47/50 (94%)
and 23/50 (46%) from mattresses and floors, respectively. Blomia
tropicalis was the predominant mite (62% of total mites) followed by
Dermatophagoides pteronyssinus (16% of total mites). Additionally, a
unique fauna was observed with samples infested with less known dust
mites such as Sturnophagoides brasiliensis, Tarsonemus granarius,
Austroglycyphagus malaysiensis, Cheyletus malaccensis, Malayoglyphus
intermedius and Suidasia pontifica. The results indicate that compared
to public places, the home still consitutes a major reservior of indoor
allergens. Allergens of the storage mite, B. tropicalis, should be
considered as a major allergenic component of dust in Singapore.
Mongolian climate and
children health
M. Erdenetuya* and R. Erdenechimeg**)
* Scientist, Information and Computer Center of Ministry of Nature and
Environment
** Doctor, Sukhbaatar Health Complex of Ulaanbaatar city
There are
human death and distribution of disease on the World, because of the
World climate changes and Weather unstable conditions. Human have
adapted to the environment, but they still have unhealthy and healthy
situation with the climate changes. In other word human health is fully
dependent on weather conditions. In case of Mongolia, the severe
continental climate has becoming the main factor of certain diseases and
their quick distribution. In time assessment of weather impact to the
human health could support the possibility to prevent from unsuitable
impact to the human health and reduction of negative influences. Air
pollution caused by human activity results in increase of some diseases
of city inhabitants in Mongolia. About 55 percent of total population of
Mongolia live in cities particularly 25 per cent live in Ulaanbaatar.
Thus the purpose of this paper is to assess the relationship between air
pollution of Ulaanbaatar city (the capital) and children's respiratory
sickness. The result of the study snows clear linear relation of
increased concentration of CO, SO2, NO2 in air and respiratory diseases.
Its correlation coefficient was 0.83. Children's Respiratory diseases of
children under 5 years old is 2-3 times higher in Ulaanbaatar than in
rural area. The results are represented in time/seasonal bases i.e air
pollution increases when air temperature changes exceeds 4.60C. Air
pollution in Ulaanbaatar increases in winter time accordingly the pick
of respiratory diseases occur in this period. Moreover, 25-42 percent of
the inspected and 32.6 percent of treated patients have respiration
diseases.
Key words: respiration diseases, bioclimate, sulfur dioxide, air
pollution.
Cognitive and Behavioral Alterations from Environmental Contaminates
David O. Carpenter, M.D.
- University at Albany, School of Public Health
There is increasing evidence
that a variety of environmental contaminates, including metals like lead
and methyl mercury and organic substances such as polychlorinated
biphenyls (PCBs), dioxins and some pesticides, cause detrimental effects
on intelligence and behavior in children. While all of these substances
cause neurotoxicity at any age at high doses, prenatal or early
postnatal exposure to such xenobiotics, when the brain is developing,
causes damage which appears to be irreversible.
The effects of lead and of PCBs on intelligence and behavior have been
best studied. Lead exposure can come from dust from leaded gasoline,
mining and smelter operations, lead added to paint and from various
occupational sources and manufactured products. The levels of blood lead
considered to be ?safe? have continued to fall, and now it is generally
accepted that at levels of blood lead of 10 µg/dl or greater there is a
decrement of IQ. The degree of IQ decrement is of the order of 4-8 IQ
points for every 10 µg/dl increment in concentration. These children
also show a shortened attention span, cause more disruptive behavior in
school and are less likely than less exposed children to perform well
academically.
PCBs are persistent chlorinated compounds that are no longer
manufactured and used in most parts of the world. Because they are
resistant to degradation both in all animal species and in the
environment, they have bioaccumulated in fish from contaminated waters.
Fish consumption is the major but not the only route of exposure to
humans. Like lead, PCB exposure in early life results in a reduction of
IQ of between 4-8 IQ points. Animal studies also demonstrate
hyperactivity and other behavioral abnormalities. Methyl mercury is
often a co-contaminate in fish, and may have similar and even
synergistic interactions with PCBs in causing IQ decrements and
behavioral alterations. There is clear evidence of behavioral
alterations in animals exposed to dioxins, furans and pesticides, but
while there has been less clear demonstration of these effects in
humans, it is likely that these substances also affect intelligence and
behavior.
Environmental contamination which results in a reduction of the
intelligence of the next generation is the ultimate pollution tragedy.
It is very important to protect children from exposure to these agents.
Performing A
Community Health Assessment
Elizabeth Guillette, Ph.D. - Bureau of
Applied Research in Anthropology, University of Arizona
A manual
describing the necessary steps for an initial community health
assessment is presented. The manual is written for individuals who lack
scientific training in research methods but are concerned about the
influences of environmental contamination on the health of their
community. Many communities of the world lack access to help from the
scientific community. Steps covered include ways to identify local
concerns, creating community interest in the topic, various approaches
to assessment, analysis of data and writing the final report. The
results of the study are meant to identify areas in which professional
research may be of value and to stimulate local change for an improved
environment. The manual is written in basic English, with definitions of
scientific terms. Limited copies of the manual will be available for
NGOs and community workers.
TOXIC EXPOSURES AND
POISONING IN CHILDREN
Jenny Pronczuk
de Garbino, M.D., Task Force on the
Protection of Children's Environmental Health, Department for the
Protection of the Human Environment, World Health Organization
This paper
presents an overview on toxic exposures in children (global aspects), on
the type and circumstances of exposure, the main chemicals involved and
the roles played by poisons centres (PCs) and related facilities. It
states the main activities developed by the International Programme on
Chemical Safety (IPCS) and the Task Force on the Protection of
Children's Environmental Health, set up by the Department for the
Protection of the Human Environment in July 1999.
Poisons Centres and related units are in a strategic position to play a
potential "sentinel" role in children's environmental health. New PCs
are being established in developing countries, and joining the existing
ones through networking arrangements that facilitate interaction and
communications. Most centres interact with health authorities and the
academic sectors, are staffed by professionals with experience in
toxicology and related sciences, and are becoming involved in
environmental health issues. More and more PCs are able to record acute
and chronic toxic exposures in children in a harmonised manner, using
controlled vocabularies and definitions. This will allow, in the future,
the compilation of a valuable database on the main toxicological
problems affecting children, including those of environmental origin.
The analyses of such a database will help assess the burden of disease
and collect the evidence for planning interventions. PCs are called to
play a more proactive role in raising awareness about CEH and contribute
to research, information dissemination, training and other activities
required for the protection of children's environmental health and
development.
DDT pesticide residue in
human milk
Dr. Frans.X.Suharyanto
Halim,
Non-Communicable Diseases Research Center, National Institute of Health
R&D, Min.of Health, Jakarta, Indonesia
Mother's
milk is the main food for a baby also as a good media for assessing
exposure of pesticide because it is easy to collect, non-invasive and
has been shown to give an indication of long term accrual of pesticide
residues. DDT was banned in Indonesia in the early 1980s (except for
Malaria Eradication Programme), but since 1994 DDT has not been used
anymore in Indonesia for Anopheles mosquito control.
Some studies concerned DDT pesticide residue in human milk was done in
Kulonprogo, Central Java, 2 years and 8 years after spraying were 45.3 +
26.0 ug/g and 7.2 + 1.9 ug/g on the fat basis (Noegrohati,1992).
However, in 1998 preliminary study was done in Jakarta (2 samples), the
result 4.8 and 17.6 ug/g fat and in Tangerang (2 samples) the result
0.37 and 4.84 ug/g fat. This study was done together with Prof.Ian Shaw
from Lancashire University, UK. It is inappropriate to draw firm
conclusions from these preliminary results because they are derived from
a very small number of samples, however they suggest that DDT is still
in use in my country. If the result compared with other Asean countries
also higher than the others.
The impact of DDT to human is still debated, and need sufficient
evidence for reproduction
organ, caused brain damage and carcinogenic effect. Finally, DDT
pesticide residue in human milk has to investigate in more samples to
get how far DDT is still use in Indonesia, and to increase & tight
monitoring of the use of DDT and law enforcement. As a result, residue
of DDT in human milk could be minimized and the mother's milk safe for
the baby.
Immunotoxicology
and Childhood Diseases
Yong Heo, Cheol Young Oh, Bo Wook Kim, Hyoung Ah Kim, WonJin
Institute for Occupational & Environmental Health, Kyonggi-do Province,
Korea, Yonsei University College of Medicine, Seoul, Dept. of
Preventive Medicine, College of Medicine, The Catholic University of
Korea, Seoul, Korea
Children are
exposed to various environmental contaminants including heavy metals,
fine particles, volatile organic compounds, polycyclic aromatic
hydrocarbons, and pesticides through ingestion, inhalation, or skin
contact. Human health risk from exposure to the environmental toxicants
has been assessed primarily on carcinogencitiy, neurotoxicity,
respiratory illness, and developmental effects. Since the immune system
of children is undergoing maturation, an immunological perturbation
resulting from exposure to an environmental toxicant may increase
susceptibility to childhood diseases such as infectious diseases,
allergic diseases, or cancer. Furthermore, a variety of neurological or
endocrinological problems may be related with environmental
toxicant-induced disturbances in immunohomeostasis, considering
accumulated evidence of neuro-endocrine-immune system cross-talks.
This presentation will focus on immunotoxicities of environmental
toxicants with major concern worldwide because of its detrimental health
effects on children populations. Immune-suppression and/or aberrant
immune-potentiation (hypersensitivity or autoimmune disease) relevant
with exposure to environmental immunotoxicants will be discussed.
Ability of immunotoxicants to modify the activities of helper T cells,
cytotoxic T cells, B cells, macrophages, and other immunoregulatory
cells will be discussed as well as effects of the environmental
toxicants on differentiation of naïve or precursor immune-component
cells. Immunotoxicological methods for evaluation of potential
immunotoxicities in experimental animals and humans will be described.
Immunotoxicities of lead (Pb), mercury (Hg), nickel (Ni), diesel exhaust
particles (DEP), environmental tobacco smoke,
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), polychlorinated
biphenyls(PCBs), and pesticides will be extensively addressed.
Some findings of a study on effects of herbicides and defoliation on
health status of people living in A luoi Valley, Vietnam
Tran Manh Hung, M.D., Hoang Dinh Cau, M.D.,
Phung Tri Dung, M.D. National Committee for Investigation of the
Chemicals used during the Vietnam War (10-80 Committee)
A large
amount of herbicides and defoliation was used to destroy the forest of
South Vietnam by the U.S. Army during the years 1961 to 1971. The levels
of use for the military operation (Ranch Hand Operation) was 20 to 40
times greater than for normal agricultural usage. A luoi Valley is an
area along the Ho Chi Minh trail. It was been one of the most heavily
sprayed areas (approximately a half million gallons). Since 1993, a
survey has been implemented by the 10-80 Committee with support from the
Hatfield Group (Canada) to assess the environmental and epidemiological
status of A luoi Valley and its population.
The initial results show that the surrounding area of the Aso airfield
has a very high level of dioxin concentration in soil. The ratios of
reproductive abnormalities and congenital deformalities are two or three
times higher as compared to the pre-war ratios. Analysis of dioxin
concentration in poultry and fish show a significant level of dioxin,
which could be a sign of the presence of dioxin in food chain. It is
difficult to provide an exclusive conclusion since there are many
uncertainties in our study. However, we could at least conclude that
with the high levels of dioxin concentration of dioxin in soil, and
especially the presence of dioxin in food chain, further studies on
herbicides and defoliation on human health need to be carried out.
Environmental Health Issues of Children in Villages in the Vicinity of a
Paper and Pulp Mill
D Koh,
SM Saw, MR Andjani*, Syafril Nurdin+, J Lee, ML Wong, SE Chia, CY Hong,
CN Ong, Department of Community, Occupational and Family Medicine MD3.
16, Medical Drive, National University of Singapore, Singapore
Recently,
some villagers living along Sungei Kampar, Sumatra, believed their
health was affected by polluted river water. The main concern was skin
complaints. It was perceived that effluent discharges from a pulp and
paper mill was the cause.
A study was conducted of the health status and skin conditions of
villagers living along the river in the vicinity of the mill. Three
villages - Rantau Baru(R) 45 km upstream, and Sering(S) and Pelalawan(P),
8 km and 25 km downstream from the mill - were surveyed.
One hundred houses in each village were randomly selected. Altogether,
145, 167, and 126 children <12 years from R, S, and P respectively were
examined by a team of doctors. Response rates were >95%. River water was
analysed on 3 occasions at locations upstream and downstream of the
mill.
Age and sex distributions of children were similar in R, S and P.
Immunization coverage was incomplete (34%, 31%, 56% for BCG). Two-week
recall rates of diarrhoea (17%, 20%, 8%), fever (35%, 20%, 21%) and
passing out worms (3.5%, 7.2% 2.4%) were reported. The majority (80%,
63%, 85%) did not have significant skin problems. Fungal infections and
non-inflammatory skin conditions were the main disorders (18%, 32% and
8% respectively). Dermatitis was uncommon (2%, 5%, 2%), and not
significantly different between upstream and downstream villages
(p=0.11). Physical, chemical and biological parameters of water quality
were generally acceptable for river water and similar upstream and
downstream.
These findings suggest it is unlikely that river water is a cause of
inflammatory skin disorders in the village children living downstream of
the mill. Skin conditions appear to be less of a priority compared to
other public health issues, e.g. incomplete immunization coverage, high
rates of diarrhoea and fever.
EPIDEMIOLOGY OF CHILDHOOD
ASTHMA
Christopher Lai, Department of Medicine &
Therapeutics, The Chinese University of Hong Kong
Epidemiology
provides information not only on the magnitude of problems a disease
imposes on society but also helps shed light on its aetiology. In an
attempt to better define the impact and aetiology of asthma, the
International Study of Asthma and Allergies in Childhood (ISAAC) Phase I
conducted standardised simple surveys in school children from most
regions of the world. Two age groups (13-14 and 6-7 yrs) comprised over
0.7 million children were studied, of which 2/3 were from the older age
group. Marked variations in the prevalence of asthma symptoms with up to
15-fold differences were seen between countries. The prevalence of
wheeze in the last 12 months ranged from 2.1-32.2% in the older age
group and 4.1-32.1% in the younger age group. Prevalence was highest in
English-speaking countries and Latin America, and lowest in the less
affluent countries in Asia, Eastern Europe and Africa.
These wide variations in asthma prevalence suggest that environmental
factors are likely to be important aetiological determinants of this
disease. Ecological analyses of the Phase I data confirmed a significant
correlation between the prevalence of asthma symptoms and indicators of
affluence, e.g. GDP, the per capita consumption of trans fatty acids,
and the notification rates of tuberculosis (negative correlation). Phase
II of the study is currently underway and will provide more information
on the environmental risk factors for asthma at an individual level.
Risk Assessment for Children and Other Sensitive Populations
Dr. Philip J. Landrigan,
Mount Sinai School of Medicine
Children
form a unique subgroup within the population who require special
consideration in risk assessment. Children are not little adults. Their
tissues and organs grow rapidly, developing and differentiating. These
development processes create windows of great
vulnerability to environmental toxicants. Furthermore, the exposure
patterns of children to environmental chemicals are very different from
those of adults. Traditional risk assessment has generally failed to
consider the special exposures and the unique susceptibilities of
infants and children. Adoption of a new child-centered agenda for
research and risk assessment is necessary
if disease in children of toxic environmental origin is to be
identified, understood, controlled, and prevented. This agenda needs to
be multidisciplinary. Specific requirements within the agenda include:
(1) exploration and quantification of unique patterns of exposure for
children (2) adoption of new, more sensitive approaches to testing
chemicals that can recognize the consequences of exposure during early
development (3) identification, through clinical and epidemiologic
studies, of etiologic associations between environmental exposures and
pediatric disease and (4) elucidation, at the cellular and molecular
levels, of the pathogenetic mechanisms
of pediatric environmental illness.
Agent Orange
and Its Effects on Children's Health
Dr. Le Hung Lam, Hanoi School of Public
Health
Agent Orange
was an herbicide employed during the years 1961 to 1971 in the Vietnam
War. It is the code name for a mixture of 2,4,5-T
(2,4,5.-trichlorophenoxyacetic acid 545.4 Kg/m3) and 2,4-D
(2,4-dichlorophenoxyacetic acid 485.1 kg/m3), altogether weighing 1 285
kg/m3. Associated with the 2,4,5-T moiety is the impurity, dioxin,
(2,3,7,8-tetrachlorodibenzo-p- dioxin). This paper is to review
currently epidemiology and environmental studies on Agent Orange and its
effects on children's health in Vietnam. Surveys of Vietnamese soldiers
show that 5% of the children fathered by veterans who were heavily
exposed to Agent Orange were born with birth defects, compared to only
1% for soldiers who remained in North Vietnam and avoided exposure. A
survey among Vietnamese veterans shows that the relative risk in the
heavily exposed group is 4.27, with a Chi square of 22.22 and p<0.001
with 95% confidence interval is 8.28-617.29. A case-control study in 2
similar villages in South Vietnam showed the birth defect in a sprayed
village was 4 times higher than in an unsprayed village (Relative risk:
4.2). A cohort study showed an obvious correlation between dioxin
exposure and birth defects in newborns: relative risk: 3.24, chi-square:
18.64, p<0.001. An analytical study of breast milk contaminated with
dioxin in South Vietnam showed that: Dioxin levels in breast milk of
nursing mothers living in South Vietnam tend to increase gradually from
the mean value of 1331.0 ppt (in1970) to 498.5ppt (in 1987-1988). Hanoi,
an area exempt from spraying missions, showed the lowest dioxin levels (TCDD=2.2ppt
TEQ=8.8ppt) meanwhile, in South Vietnam, TCDD and TEQ in Ho Chi Minh
city are respectively 7.7ppt and 18.5ppt and in Song Be are 17.0ppt and
31.7ppt (on basis of fat containing in breast milk). A chromosomal
analysis in generation F2 of Agent Orange exposed veterans has noted
higher frequency of most chromosome aberrations than that of control
group (p<0.001). Even with the limitations on research in Vietnam, there
are strong indications that exposure to dioxin has led to a significant
increase in serious birth defects.
Environmental threats to the health of children in Cambodia
Long Vudthy,
Participatory Action Research Specialist for United Nations Volunteers &
Project Manager for Community Khmer Traditional Medicine, Lucent
Rainbows Foundation, Cambodia
Cambodia is
one among the poor countries that was affected by the civil war almost
two decades. So far, every infrastructure like: school, road, irrigation
system and especially, the hospital are not found to be rehabilitated.
These factors often cause many trouble to the people especially, the
children. Major issues that threaten to the children's health are from
many factors:
Children of the poorest families living in rural areas where the primary
health care information is not adequately disseminated or the children
whose parents lack the family hygiene often face with many health
problems. This would lead them to various types of diseases like
diarrhea and dysentery as very much often these diseases are caused by
unclean water from their hand-made wells, the wells that have always
covered by annual flood or refilled by cattle's waste or of other
various contaminated elements.
Homeless children. Group of homeless children are also affected by
health problems as normally, they live by the roadside and malaria is
also found in these children as well, as at the night time they have
slept without mosquito-net. Some children are breathing with the bad
smell of ugly atmosphere from the pile of the garbage everyday, possible
exposing to trace dioxins in the dangerous smoke from uncontrolled open
burning. These children generally go to the rubbish pit to pick up
beer-bottles, beer-can or eat expired food being thrown away by sellers.
Groups of these children are found to be infected by Typhoid Fever as
the bacteria goes from their fingers to the mouths while eating without
properly washing.
- Children eat expired food sold in the market by bad business people.
- Drinking water of bad quality from hand-made well as the water is
mixed with Iron element and bacteria.
- Uncontrolled garbage. Uncontrolled garbage in city or around the
houses is also another serious problem to the health of children through
the flies, mice or other insects that are transmitted agents.
Mosquito is another agent that bring up with malaria at the night time
and another type of these mosquitoes that are called "Tiger mosquitoes"
can cause the dengue fever to the children at the day time. The sources
of these insects are from the pile of garbage or rubbish pit.
- Using pesticide: In Siem Reap alone from the end of 1999 till the very
beginning of the year 2000, about 23 % of children age from 6 to 12
years old in the village around Angkor Park are found to have skin
disease because of pesticide (toxic drug) like DDT being used by farmers
where many farmers have grown the vegetable, water melons.
Children exploitation. Many children were smuggled or sold to the
neighboring countries and forced to be the beggars by groups of bad
people who absorb the benefit over the children. (Some children were
forced to receive type of medicine that destroyed their limbs and then
they became disable. This is what the thugs thought that it could be the
easy way to beg). All income that children received from generous people
were confiscated by these bad people and the children can get only very
little benefit through their efforts.
The environment of the child, children's energy and their sense of
wonder; we mean the atmosphere, situation, condition, among the body of
the children; the air, water, ground and soil, and of the living
threats, from HIV, viral hepatitis and polio, of having enough
nourishment, the landmine kill the small body, of refugee trauma, of
family and of mothers, and of the Khmer women depression relief.
|
|
"Home"
for some children at the Phnom Penh city dump consists of makeshift
shelter located on top of the garbage |
A
young girl scavenging for food and items to sell at the Phnom Penh
city dump |
Children and Environmental Toxicants: The Philippine Experience
Irma Makalinao, M.D., Department of
Pharmacology and Toxicology University of the Philippines College of
Medicine; National Poison Control and Information Service University of
the Philippines - Philippine General Hospital
Various
forms of toxicants beginning at the home environment confront the
Filipino child. Data from our Poison Center shows that accidental
poisoning occurs as a consequence of exposure to household poisons like
kerosene, insecticides, rat killers, naphthalene balls and bleaching
agents to name a few. Since 1991, accidental ingestion of a dancing
firecracker called "watusi" became an important cause for mortality and
morbidity among our children. White phosphorus is the most toxic
component of "watusi". While exposure to environmental tobacco smoke has
been an old problem, today the Filipino child is threatened by in-utero
exposure to a methamphetamine.
At the national level, the Filipino child is exposed to various hazards
from industry and occupations engaged in by the adults in their
environment. For example, neurotoxicity following metallic mercury
exposure from gold torching in the home environment has been documented.
Toxicity following chronic exposure to lead and mercury is an area of
major concern. There are
on-going community health assessments being undertaken jointly by the
National Poison Control and Information Service and the Department of
Health. Chelation therapy among school children in Tagum, Davao with
elevated blood mercury levels has been done beginning in 1997.
The magnitude of lead poisoning among Filipino children cannot be
underestimated. Significant sources of lead exposure include unleaded
gasoline, battery recycling and mining activities to name a few. In
1996, one of the worst mining accidents took place in the Marinduque
Island. Over a period of several weeks 2 million cubic meters of
tailings poured from the tunnel into the Makulapnit and Boac rivers
making them unsuitable for use.
In response to this environmental disaster, an immediate community
health assessment was conducted in Boac, Marinduque where elevated
levels of lead, copper and cadmium was documented for the fist time in a
few of the residents examined. In 1997, 7 out of 41 children examined
had blood lead levels (BLL) between 11 - 13 ug/dL. Six months later, the
levels went up to 13 - 19 ug/dL. Varying degrees of malnutrition and
anemia were noted. The children complained of weakness, easy
fatigability, dizziness, poor weight gain and abdominal discomfort.
EMG-NCV studies showed that all the seven children exhibited mild to
moderate motor-sensory polyneuropathy the etiology of which was
non-specific. In another batch of children with levels below 20 ug/dL
initial nerve stimulation studies for children were
mildly abnormal. Abnormalities were the reduction in the amplitude of
the compound muscle action potential of the peroneal (6/8), tibial (4/8)
and median nerves (3/8). Abnormalities in the reduction of the amplitude
of the sensory action potential of the median and ulnar nerves were
found in one patient. Vitamin and mineral supplementation has been
started. After nearly 1 - 2 years of follow-up chelation therapy with
DMSA was initiated for the symptomatic children while carefully
monitoring them for any adverse effects. A remarkable improvement in the
over-all health status of the children was noted immediately post-chelation.
It is very difficult to ignore the fact that lead has no physiologic
value in the human body.
Recent studies show that adverse neurobehavioral effects may occur at
blood lead levels below 10ug/dL. Thus, the decision to finally chelate a
child must be done on an individual basis.
Deterioration of children's health due to
environmental causes is directly related to the increase in
breast cancer incidence
Danilo V. Meneses,
Philippine Breast Cancer Network
In the
region of Western Mindanao with a population of 2.8 million where 75%
live below poverty level, only 120,664 or one fourth of households have
access to safe water facilities - all in the urban areas of the three
provinces. This situation can be understood from the fact that only 14%
of 17,563 hectares for reforestation has been accomplished and an aerial
view confirms that much of the rainforest areas have already been
denuded. In Zamboanga del Sur, severely eroded areas constitute 269,170
hectares or about 41% of the total land.
The three bodies of water in Zamboanga del Norte - Murcillagos Bay,
Gipit River and Siocon River - are contaminated with high concentration
of mercury due to the operation of gold mining. There already have been
reports of children suffering from hemoglobinuria, a disease resulting
from massive destruction of the RBC due to metal intoxication.
In Zamboanga City, the Tumaga River continues to deteriorate with the
growing number of industrial firms along its banks. The city sewerage
system itself drains untreated waste water right into the R.T.Lim Blvd.
beach resort, a weekend resort for the city folks. Moreover, not one of
the hosipitals in the area has an approriate biomedical waste disposal
system.
The UNICEF now regards the mortality rate of children under five (U5MR)
as a truer indicator of a population's well being, rather than the
infant mortality rate (IMR). The Philippine's latest figures in 1995
showed that the national U5MR is 53. Western Mindanao (Region 9)
reported higher rates: Zamboanga del Norte 83.10, Basilan 82.82 and
Zamboanga del Sur 78.57.
Today, Western Mindanao has the highest increase in cancer incidence
rate in the entire island at 76% over the last recorded period and for
which now stands to be the 4th leading cause of death in this region.
Breast cancer is not only the leading type for women but for all cancers
as well.
Women have been taught to look within themselves for the cause of their
breast cancer genes, their unwise reproductive choices or their
stressful lifestyle. Although these factors may contribute to breast
cancer and other cancers, they are only part of the story. What about
the dioxin in breast milk? What about pesticides in amniotic fluid? What
about mercury in drinking water? The toxic world we live in is wounding
our children before they are born: sometimes these wounds lead to birth
defects, sometimes to asthma. Sometimes they lead to breast
cancer or other cancers.
The greatest risk of getting breast cancer tomorrow is being born today
in a developing country. The greatest risk of not surviving breast
cancer today is just being a woman in the Philippines.
Persistent Organochlorine Residues in Human Breast Milk from Cambodia,
India, Japan and the Philippines
Maricar S. Prudente, Shinsuke Tanabe,
Mafumi Watanabe and Annamalai Subramanian, De La Salle
University-Manila, Philippines Center for Marine Environmental Studies,
Ehime University, Japan Annamalai University, India
Concentrations of persistent organochlorine residues such as
hexachlorocyclohexane isomers (HCHs), hexachlorobenzene (HCB), chlordane
compounds (CHLs), dichlorodiphenyltrichloethane (DDTs) and
polychlorinated biphenyls (PCBs) were determined in milk, sampled in
1998-1999 from mothers living in Cambodia, India, Japan and Philippines.
Formula milk powder from two leading food companies in Japan were also
analysed for residues of these organochlorine compounds. Differences in
contaminant pattern was observed among the countries with DDTs found to
be rather high in Cambodia, HCHs highest values in samples from India
and those from Japan have high PCBs residues. While OCs residues were at
comparatively lower levels in the milk samples from the Philippines, it
was evident that breast milk samples analysed here have higher residual
OCs concentrations compared with the very minimal residues found in
formula milk powder studied.
ENVIRONMENTAL POLLUTION IN TRADITIONAL SMALL SCALE & COTTAGE INDUSTRIES
- OCCUPATIONAL HEALTH FOR WOMEN AND CHILDREN
Dr. S.Rajamani and Ms.R.Ramya, Department
of Environmental Technology, CLRI., India
In most of
the South Asian countries including India for socio-cultural and
economic reasons, among others, occupational health of women workers,
direct and indirect influence on children call for specific attention
since large percentage of women are engaged in unorganized, traditional
and unprotected small scale and cottage industrial sector such as Beedi
(indigenous cigarette) rolling, match and fire works, hair collection
from animal skins in tanneries etc. Even in Organized industries like
electronics and chemical industries, emphasis for in-depth in study and
support to the improvement of occupational health and safety of the
"female" workers is considered essential. This is not only because of
women's biological requirements as child bearers and nurtures but also
because of the distinctly different nature of their roles on the labour
market.
Some of the studies reveal that in the Beedi industries where more than
2 million female workers are involved, the main hazard is tobacco dust,
which was found to cause, among others, burning sensation of the eyes,
conjunctivitis, mucosal dryness, occupational dermatitis and bronchitis.
The investigation on gynecological health aspects indicated that more
than 90% women workers have some problem or other like, exhaustion,
dizziness, pain in the lower abdomen, menstrual period began earlier
than due date, frequent miscarriages etc. In addition to social and
cultural reasons, insufficient safety and Environmental problems like
inadequate ventilation, absence of separate wash and bathing areas for
women workers, particularly in industries handling hazardous chemicals
like tanneries, electrochemical units result in the transfer of
pollutional effect to young children at home and child growth in case of
pregnant women.
Systematic studies on occupational health of women and environmental
threats to children are gaining importance in countries like India.
Though legislation exist for monitoring of working environment and
social security benefits, the lack of ability to realize Environmental
problems and inadequate information or skills have not resulted in
desire improvement.
Mechanisms and Triggers of
Asthma
Dr. Peter D. Sly, Paediatric Environmental
Health Group, TWVT Institute for Child Health Research, Curtin
University of Technology, and Murdoch University
Recent
epidemiological studies have demonstrated that several asthma syndromes
exist and suggest that they may have different risk factors. The main
syndromes are: transient infantile wheeze viral-associated wheeze and
atopic asthma. The role of atopy in asthma is well recognized but the
reasons why many atopics do not develop asthma are less well understood.
Initial priming of T-cells to environmental allergens occurs inutero. At
birth the normal T-cell response to food and inhalant allergens is to
produce cytokines typical of the T helper type 2 (TH-2) response, ie
IL4, 5, 9 & 13. By late childhood, the normal response has changed to a
TH-1 type response, producing interferon gamma and IL-10. The failure of
this normal
immune deviation seems to underlie the development of atopy. Exposure to
allergens may not be enough to produce allergic sensitization.
Environmental irritants may act to increase the prevalence of asthma by
producing airway inflammation and this may increase the risk of
sensitization. However, atopic sensitization appears to be a necessary
but not sufficient state for the development of asthma. Other factors
are required to consolidate the inflammatory response and produce the
airway-remodeling characteristic of asthma. The prevalence of atopy and
asthma are higher in the developed world. A decrease in the overall
microbial load children are exposed to may be responsible. However, the
relationship between early respiratory infections and the development of
asthma is unclear. Primary prevention will require a better
understanding of the mechanisms involved in initiating asthma.
Risk Assessment Issues and Approaches to Children's Environmental Health
Babasaheb Sonawane, Ph.D., National Center
for Environmental Assessment, Office of Research and Development, U.S.
Environmental Protection Agency
In 1995, the
Administrator of the Environmental Protection Agency (EPA) was directed
to explicitly and consistently take into account environmental health
risks to infants and children in all risk characterizations and public
health standards set for the United States. In 1996, EPA announced a
National Agenda to Protect Children's Health from Environmental Threats.
On April 21, 1997 President Clinton issued an Executive Order (EO) on
the Protection of Children from Environmental Health Risks and Safety
Risks. The 1996 Food Quality Protection Act (FQPA) contains specific
provisions to protect the health of infants and children in the absence
of complete data on the harmful effects of pesticides and calls for the
re-evaluation of nearly 10,000 existing pesticide tolerances within
ten-year period. The 1996 Safe Drinking Water Act Amendments include a
new focus on setting priorities based on risk to sensitive
subpopulations from exposure to drinking water contaminants. These and
some other drivers such as the National Academy of Sciences report in
1993 on Pesticides in the Diets of Infants and Children and the Office
of Science and Technology report issued in 1997 on Investing in our
Future: a National Research Initiative for America's children for the
21st century? have focused our attention on the children's environmental
health.
Toxic responses in infants and children can differ markedly from those
observed in adults. Differences in the developing infant and child
effect absorption, dose, distribution, metabolism, and excretion of
xenobiotics, and therefore, adverse health outcomes. The most
distinguishing characteristic of infants and children is that different
organ systems develop at different rates and at different phases of
life. Children may be more susceptible to chemical exposures affecting
proliferating cells and developing tissues, therefore, issues of concern
pertain to all steps in the risk assessment process. In considering
whether risk assessment approaches are protective of children, there is
a concern whether the current methods for hazard identification are
adequate to detect environmental agents of public health concern. For
example, standard animal bioassays for identification of carcinogenic
agents does not include perinatal exposure. Similarly, emphasis of most
of the epidemiological studies is based on healthy adult males. Infants
and children differ from adults, both qualitatively and quantitatively
for exposures to environmental agents because they consume more food,
drink more water, and breathe more air per unit of body weight than
adults do, therefore, they are likely to be exposed to higher levels of
potential toxicants such as pesticides, air and water contaminants. The
micro- and macroenvironment and associated activity patterns of infants
and children rapidly change through development and also vary by
demographic and cultural differences. Very limited data exist for
exposure assessment of infants and children. Differences in
pharmacokinetics (absorption, distribution, metabolism and excretion) by
inhalation, ingestion, and dermal routes of exposure may have impact on
adjustment of dose-estimates to account for differences in infants and
children from adults. The current default approaches for extrapolation
dose-response data such as linear in the low dose region to estimate the
potency of carcinogens, does not incorporate any provision for
vulnerability of infants and children. An important question for
developing any guidance to assess risk of environment agents of concern
is to recognize differences between children and adults and to
incorporate mode of action information. Admittedly, the differences in
dose, and mechanism of action data are lacking for quantitative risk
estimation. We need to generate sufficient information regarding the
differences in exposure, susceptibility, and toxicity for infants and
children to better characterize the risk of environmental agents of
concern. The U.S. EPA and other federal agencies are actively promoting
and supporting research in this area and have created a database called
"CHEHSIR": Children's Environmental Health and Safety Inventory of
Research. CHEHSIR is currently available on line at www.epa.gov/chehsir.
(Disclaimer: The views expressed in the abstract are that of the author
and does not reflect the U.S. EPA policy or endorsement).
Exposure assessment of environmental microbes for children in southern
Taiwan
Dr. Huey-Jen Su, Dept. of Environmental and
Occupational Health, National Cheng Kung University Medical College,
Tainan, Taiwan, ROC
While
children's health effects resulting from exposure of general air
pollutaion remain the focus of much research interest, increasing
literature has suggested associations between damp environments,
microbial exposure, and higher prevalence of respiratory symptoms and
diseases.
We have conducted a series of studies characterising the environmental
microbial exposure of children living in Tainan City, a typical
metropolitan city in southern Taiwan where high temperature and humidity
present year-round. A representative gourp of homes were selected
for environmental measurements based on data from a prior questionnaire
survey of housing characteristics. Respiratory health evaluation, mostly
by diary record and some including clinical assessment, was conducted on
children living in these homes.
Our results indicate that exposure to airborne microbes can be a more
significant factor affecting the children's respiratory health while
exposure of other air pollutants are also taken into account. In
addition, significantly higher levels of airborne fungi were observed in
this region than those seen in either northern Taiwan or other parts of
the world. Around 65% of the child's mattresses are with Der p 1 levels
greater than 2 ug/g, seasonal effects seem to be a critical factor for
the concentations and distributions of domestic microbes. Finally,
higher symptom scores are shown in children from homes with higher
fungal concentrations, and higher
total IgE are also found in these children.
Future investigations are desired to futher quantify how the long-term
exposure to these high levels of environmental microbes may affect the
children's health in general and how these effects may vary with the
seasons.
The
Global Burden of Environmental Disease in Children
Dr. William A. Suk,
National Institute of Environmental
Health Sciences (NIEHS)
Patterns of
illness in children have changed dramatically in this century. Chemical
toxicants in the environment as well as poverty, racism, and inequitable
access to medical care are factors known and suspected to contribute to
causation of a variety of pediatric diseases. Children are at risk of
exposure to over 15,000 high-production-volume synthetic chemicals,
nearly all of them developed within the past 50 years. These chemicals
are used widely in consumer products and are dispersed in the
environment. Children appear uniquely vulnerable to chemical toxicants
because of their disproportionately heavy exposures and their biological
growth and development. The etiologies of many diseases of childhood are
due to a combination of factors, including genetic susceptibility and
environmental exposures during vulnerable periods of development.
Over the years, estimates have been made of the portions of mortality
and morbidity that can be attributed to environmental factors. These
figures are especially important to assess risk critical to the health
and well-being of children. In the world today, it is the health of
children under five years of age that is most damaged by poor
environmental quality. It is estimated that one-quarter to one-third of
all ill health in the world today may be attributable to environmental
factors. Environmental exposure is a major factor both in the infectious
diseases that tend to affect the poorest population groups and, to a
lesser extent, in the chronic diseases that tend to affect the richer
groups. The implication is that many of the most critical health
problems in children cannot be solved without major improvement in
environmental quality. This presentation will be a charge to the
conference summarizing the major issues and major needs surrounding the
disease and dysfunction burden on children's health in response to
environmental exposures.
Thanal
Conservation Action & Information Network
Usha S., Deepa V.S., Sridhar, R., and
Jayakumar C., Thiruvananthapuram, India
Periya in
Keralam of India is a village. This is similar to any other rural
villages of India but being in Keralam the village has a good number of
people and greenery. The midland laterite hills and the nearby sea adds
richness in biological diversity.
Every year the Plantation Corporation of Kerala bring their helicopters
and sprays endosulfan in their Cashew plantation. About 1300 families
live adjacent to the plantation. The children are usually excited to see
the helicopters and they come out to see the machine. They also get a
show of some unknown stuff. The Corporation workers and managers said
that those are harmless and safe.
This happened for nearly two decades. The people of the region are now
mostly affected and the children are the worst affected. The pesticide
endosulfan is persistent and stays in soil for more than five years. The
children get the poisoning regularly through the skin from the soil. The
paper is on the diseases of children, the threats to the children and
the profit of the Corporation at the cost of child's health.
Regional Environmental Issues Concerning Children's Health - A
Situationer
Corazon Yabes-Almirante M.D., Perinatal
Center Phil. Children's Medical Center
Environmental threats to children's health are many and in the Phil. and
its neighbors (ASEAN countries) these are identified to be associated
with poverty, livelihood, effects of natural calamities (volcano
eruptions, forest fires, flooding). In addition there is the issue of
toxic waste
which is unique to the Philippines.
Inadequate water supply and sanitation and exposure to vector-borne
diseases are associated with poverty. As of 1996 the Philippines ranks
no.32 out of 100 in potential exposure to polluted water. Singapore is
no.5, Thailand 18 Malaysia,25 and Indonesia,59. In 1998,80.8% of
households in the Philippines had sanitary toilets 86.8% had safe water
and 62.5% of households did not buy street foods. Malaria is present in
0.345 % of population in the Philippines,0.008% in Singapore, 0.177% in
Thailand, 0.299 in Malaysia, 0.870% in Cambodia, 1.111% in Laos, 1.189%
in Vietnam. Widespread exposure of large number of children to heavily
polluted air is a relatively new public health issue. More people live
in expanding urban
and industrial zones than at any other time in history. Poor controlled
industrial emissions and automobile exhausts are products of increased
urbanization and rapid industrialization, which could have been avoided
with proper control in place the experience of the European countries.
No matter what source of air pollution, children are more severely
affected than adult. A 3 year old absorbs 2 times that of an adult per
unit body weight. The air pollutants are TSP, BS, PM-10, Lead, SO2, NO2,
CO. TSP and black smoke, SO2 were the pollutants of the Mt. Pinatubo and
Mt. Mayon eruptions,
forest fires in Indonesia and the Philippines in 1997, 1998 and February
2000. Children in rural areas maybe spared air pollution from automobile
exhausts and industrialization but they are exposed to indoor pollution,
burning of biomass fuel and to pesticides and chemical fertilizers used
for agriculture. Extremely dangerous pest killers banned in developed
countries such as parathion, paraquet, chlordane, hundane and PCP are
dumped and sold to unsuspecting developing countries.
The Philippines, Thailand and Indonesia are ranked number 10 out of 10
for potential exposure to polluted outdoor air. Malaysia is ranked no.4
and Singapore no. 1. The effects of pollutants and infectious agents are
exacerbated by inadequate nutrition. Children who are malnourished and
deficient in micronutrients are more vulnerable to the ill-effects of
polluted air and water. In 1996, 30% of children under 5 years in the
Philippines were underweight,40% had Vitamin A deficiency and 24% had
Iodine deficiency. Malaysia had 23% underweight under 5 year old, 25%
and 26% Vitamin A and Iodine deficiencies Indonesia 35%, 60% and 50%
Cambodia 40%, 75 and 19%
Laos' 44%, 40 and 34%, respectively. Pollutants not only affect the
children but also the unborn and the newborn. A study was done comparing
the carboxyhemoglobin levels of mothers and their newborns in Quezon
City and Samal Island, Davao. The CoHb levels of the mothers and their
infants were higher in Quezon City than in Samal Island. Some babies
from Quezon City had values higher than 10% but were asymptomatic. The
issue of toxic waste from former U.S.bases Clark and Subic in the
Philippines was dramatized recently with the death due to leukemia of a
6 year old living in one of the evacuation centers. Weston international
conducted a baseline study on water supply in August 1997 and
recommended closure of wells that were contaminated. Other contaminated
areas were also identified and a task force was created January 18,2000
to address immediately identified environmental and health concerns. It
is not just toxic waste but also solid waste disposal that has become a
problem. As of 1994 4,800 metric tons of solid waste was produced in
Manila and this could be doubled in 5 years if nothing is done. Sanitary
landfill will not be enough and incineration was not accepted.
Electromagnetic field, dubbed the asbestos of the 90s, to which we are
exposed whenever electricity is used is the scourge of the future. It is
exemplified by high tension wires, radioclocks, cellular phones.
Extremely low frequency fields like video display terminals, televisions
interact at the cellular level and may affect the unborn and may cause
cancer. There has been no extensive study but there have been reports of
the effect of VLFEMF on cancer, congenital malformation, abortion,
still-birth, and fetal growth.
Dioxins in
the foodchain of Ya-Er Lake area, China
Y. Xu1, W.Z. Wu1, K.W Schramm2, B.
Henkelmann2, A.Kettrup2, 1 State Key Laboratory of Freshwater Ecology
and Biotechnology, Institute of Hydrobiology, Chinese Academy of
Sciences, Wuhan , China, 2 GSF-National Research Center of Environment
and Health, Institute of Ecological Chemistry, Germany
The
consumption of contaminated fish and eggs can be significant
contributions to the daily intake of PCDD/F, especially in the case when
people use wastewater and sewage sludge for fish culture in some
industry area. Ya-Er Lake is located in the middle part of China
connecting the Yangtze River. The lake was heavily polluted by
discharging chloralkali effluent from 1965-1993. We selected the five
oxidation ponds near effluent inlet in the lake area as our study sites
and investigated the transfer and biooaccumulation of PCDD/F in Ya-Er
Lake area. Water, sediment, macroinvertebrate, fish, fish-eating bird,
duck, duckeggs and human milk were collected and analyzed in 1997. As
high as 420 ng I-TEQ /kg of PCDD/F found in sediment demonstrate the
serious pollution of the lake by PCDD/F. Our study results indicates:
the high concentration of PCDD/F in sediment can accumulate by aquatic
organisms and humans through various pathways. Benthic invertebrate and
aquatic plants with plenty of root system accumulate PCDD/F from
sediment and water. Snail, mussel and shrimp take up PCDD/F from water
and maintain the emission concentration patterns. But fish tend to
selectively accumulate 2,3,7,8-substituted isomers from the aquatic
environment. As the top predators, the fish-eating bird and pen-cultured
duck are highly contaminated by PCDD/F due to the bioaccumulation via
foodchain. The preferential residues of the 2,3,7,8-substituted PCDD/F
in the fish, duck, fish eating bird and human milk may show the
important biotransformation of PCDD/F. The high bioaccumulations in
fish, pen-cultured duck, fish eating bird,their eggs and human milk are
related the high concentration of PCDD/F in sediments. In Ya-Er Lake
area, fish is the primary protein resource, the daily intake of PCDD/F
for the local resident is calculated as 9.14 pg I-TEQ /kg body
weight/day, which is considerably higher than the TDI of WHO for PCDD/F
(1 pg I-TEQ/kg body weight/day).
Air Pollution
and Children's Health in Hong Kong
Tak-sun Ignatius YU, Dept. of Community &
Family Medicine, The Chinese University of Hong Kong
Air
pollution is the most important environmental concern of people in Hong
Kong and a number of studies have been carried to look at the health
effects among children over the past ten years.
Four cross sectional studies were conducted during the years 1989 to
1995 comparing the respiratory health of children living in different
communities of Hong Kong with contrasting air quality. Three studies
were conducted among schoolchildren aged 8-12 and the other one was
among pre-school children. All studies showed a higher prevalence of
respiratory symptoms and illnesses in communities with poorer air
quality after adjusting for potential confounding variables. The studies
among schoolchildren also showed poor ventilatory function and increased
bronchial hyper-reactivity in the more polluted communities. Legislation
was introduced in 1990 to reduce the sulfur contents of industrial fuels
and following that, significant reductions of respiratory symptoms and
bronchial hyper-reactivity were observed.
A time series analysis looked into the relationships between daily
levels of air pollutants and daily hospital admissions into all public
hospitals with 24-hour emergency services during the years 1994 and
1995. Children under 5 accounted for 31% of respiratory diseases. Using
Poisson regression models and following the APHEA protocol, the number
of admissions due to respiratory diseases was found to be significantly
associated with the levels of NO2, PM10 and O3, with relative risks of
1.020, 1.019 and 1.019 respectively for an increase of pollutant level
by 10g/m3.
Air pollution control would likely bring improvements to the health of
children in Hong Kong.
Risk Communication in Japan.
Yoko
Tsurugi, Sinya Matsuda
Department of Preventive Medicine and Community Health
University of Occupational and Environmental Health, Japan
During
the period of rapid economic expansion after World War 2, the
environmental contamination and nature destruction became major social
problem in Japan. Of course, there had existed the environmental
pollution before the war, general public believed that the black smoke
from the factory was just the symbol of the
industrialization.
However, these development produced the outbreak of severe Industrial
Pollution, such as Itaiitai disease(intoxication of Cadmium), Minamata
disease(intoxication of Organic Mercury), Asthma and COLD in principal
industrial zones.
Japanese government, regarding this situation as Crisis for the first
time, enacted the Basic Law for Environmental Pollution Control in 1967
and established the Environmental Agency in 1971.These situation and
movement made the general public become increasingly hazard conscious.
General public began to regard the environmental pollution as the Risk
on their health. These policies, combined with efforts of both citizens
and local government, corporate investment in pollution prevention and
technological developments showed remarkable results by mid-1980s.
However, our socioeconomic system and lifestyle have been changed.
During these years of economic growth, mass production, mass consumption
and mass disposal have become an even more an integral part of both
Japan's socioeconomic activities and its way of life. Then new, complex
and various environmental problems has occurred.
Even
the Basic Law for Environmental Pollution control ware drafted ton
combat serious industrial pollution, it could no longer deal adequately
with these new problems.
So,
Japanese government enacted new law, the Basic Environmental Law in 1993
and formulated the Basic Environmental Plan in 1994.
Environmental Risk is defined that 'potentially harmful effects on
human health and ecosystem resulting from the production, utilization
and disposal of chemical substances,' in the Basic Environmental Law.
Living in the convenient society, we can only reduce these risks and it
is difficult to make quality standards. So, Environmental Risk
Management must be done and to make correct judgement, we have to share
the correct information about risk.
Risk
communication is the one of the methods to exchange information. In
Japan, we have a kind of risk communication system, but it still has a
lot of barriers. Effective risk communication is not something that
comes naturally. It is a product of knowledge, preparation, training and
practice.
Environmental
Threats to the Health of Children
Jim Fitzgerald, Southern Australia Department
of Human Services, Australia
In South Australia, as with
many developed areas of the world, asthma is a high- incidence ailment
and the major environmental-related health condition among children.
Other environmental health threats discussed in this presentation
included poor water quality in remote Aboriginal communities,
cyanobacterial toxins in potable water sources and recreational lakes,
and various circumstances of exposure to lead. Increasingly, in the
multicultural milieu which is a feature of Australian society,
exercising cultural sensitivity in risk communication is becoming
important.
Of these environmental
health concerns, the one for which effective risk communication and
community participation is best exemplified is the chronic lead exposure
in the lead-smelter town ofPt Pine. Over some 16 years, in conjunction
with a major effort to reduce general and point source lead exposures, a
concerted program of risk communication and risk 'ownership' has been
undertaken among the 15,000 residents. This has involved a number of
ongoing activities including the establishment of education programs in
the schools and pre-schools so that students and parents are
aware of the risks. A mascot
dinosaur cartoon character- 'Pea-bee' -has been created to spread the
message of risk and avoidance, and he appears in print foffi1 on a large
range of products suitable for young children. Community awareness is
also
maintained through regular
advertising in the local media, the provision of qualified speakers at
service clubs, and through offering free blood tests; current blood
testing compliance in children over the age of 5 is 95%. These
activities are coordinated and run from an on-site Environmental Health
Centre which also houses a laboratory for conducting blood-lead tests
and lead exposure-related research. The experience gained in risk
communication in Pt Pine has been extremely useful in dealing with
environmental health risks in other situations.
Fundamental Components of Risk Communication and Building Networks for
Communication
Ms. Joy E. Carlson, Children's
Environmental Health Network, United States
Risk communication
traditionally was thought to be the imparting of knowledge from
professionals to the community about specific actions to take to reduce
the risk of injury or harm. Today we know that risk communication is an
interactive process that occurs between community and professionals and
also includes policymakers, scientists, health care providers, as well
as community members. The importance of involving multi-sectoral and
multi-disciplinary stakeholders is illustrated through the example of
the Children's Environmental Health Network, USA. Its mission is to
promote a healthy environment and to protect the fetus and child from
environmental hazards. This national organization has helped to create
the field of children's environmental health. It has framed the
policy and research
agendas for the US, trained health care providers, and involved
researchers, policymakers, health care professionals, and national
organizations in this effort. (More information is available at http://
www. cehn. org)
Fundamental components of
risk communication for any topic or group include:
What is the message? Is
it the right message for the specific audience you are addressing?,
Who is the audience--
know your target audience, what their needs and concerns are. Involve
them in the risk communication process at all times.
Who is the Messenger?
Part of knowing the audience is knowing whom they will trust; have a
messenger people can believe.
What actions are you
suggesting? What actions are you requesting that your audience take (i.e
for community it may be to stop eating fish as frequently, for
policymakers it may be to include children in regulations, for health
care providers it may be to take an environmental health history)? What
actions are you, the risk communicating community, willing to take to
work alongside these different constituencies to address the problems?
RISK COMMUNICATION AND THE PROTECTION OF
CHILDREN’S ENVIRONMENTAL HEALTH
Terri Damstra, Ph.D.,
World Health Organization
Effective
communication on the risks of environmental hazards to children is
critical to developing intervention and prevention programs. Risk
communication is not a one-way transfer of information from the expert
to the non-expert, but an interactive process of exchange of
information and opinion among individuals, groups, and institutions.
Risk messages must be accurate, credible, and understandable. In order
for risk messages on the environmental threats to children not be
misleading, they must be evidence-based and placed in an overall
framework of priority concerns regarding children’s health. In order to
obtain a realistic perspective of the major issues related to children’s
environmental health in Pacific Basin countries, a questionnaire was
sent to participants prior to the meeting. The following tables
summarizes the responses from 34 participants representing 12 countries.
TABLE
1 |
Summary of Questionnaire Results Regarding Major Environmental
Threats
to the Health of Children in Pacific Basin
Countries |
Priority Health Concerns* |
Sources |
Agents |
1. Respiratory Diseases |
- Traffic
- Air pollution
(indoor/outdoor)
- Industry |
Particulates
Nox
Sox
Carbon Monoxide |
2. Water-borne Diseases
(diarrheal, G.I.) |
- Industry
- Inadequate sanitation |
Bacteria
Parasites |
3. Poisonings, Accidents |
- Household products
- Industry |
Pesticides
Hazardous wastes |
4. Impaired
Neurobehavioural Development |
- Industry |
Lead, mercury, dioxin,
PCBs |
*Priority order based on
percentage of responses. |
TABLE
2 |
Summary of Questionnaire Results Regarding Risk Communication of
Children’s Environmental Health (CEH) |
Government Awareness
Policies/Regulations
Availability of Data Bases |
Mechanisms of Risk Communication* |
Barriers of Risk Communication* |
Opportunities to Improve Risk Communication* |
Excellent (10%)
Some
(55%)
None
(35%) |
1. Mass Media |
1. Lack of expertise and
resources. |
1. Increased community
awareness and concern. |
|
2. Physicians, health
professionals, educators. |
2. Lack of communication
among government sectors. |
2. International
pressures and concerns. |
|
3. Government |
3. Political/cultural
influences. |
3. Availability of
electronic means of information disemmination. |
|