America s Children
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A First View of Available Measures
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America's Children
and the Environment:
A First View of Available Measures
Office of Children's
Health Protection
NCEE0
NATIONAL CENTER FOR
ENVIRONMENTAL ECONOMICS
POL
ECONOM
INNOVAT
CY
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Table of Contents
Acknowledgments 1
Summary List of Measures 2
About This Report 4
Key Findings 8
Part I: Environmental Contaminants 11
Outdoor Air Pollution 14
Indoor Air Pollution 20
Drinking Water Contaminants 22
Pesticide Residues in Foods 28
Land Contaminants 30
Part II: Biomonitoring 35
Concentrations of Lead in Blood 38
Part III: Childhood Diseases 43
Respiratory Diseases 46
Childhood Cancer 52
Future Directions 57
References 62
Glossary of Terms 65
Appendix A: Data Tables 67
Appendix B: Data Source Descriptions 75
Appendix C: Environmental Health
Objectives in Healthy People 2010 85
America's Children and the Environment: A First View of Available Measures
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Acknowledgments
any individuals and agencies assisted with the preparation of
this report.
The report's principal authors and project managers wereTracey J. Woodruff and Daniel
A. Axelrad, of the U.S. Environmental Protection Agency's (EPA) National Center for
Environmental Economics, and Amy D. Kyle, of the University of California at Berkeley,
School of Public Health. This report was edited by Brad Hurley of ICF Consulting. This
report would not be possible with out the support and leadership of Ramona Trovato,
Director of the Office of Children's Health Protection and Al McGartland, Director of
the National Center for Environmental Economics.
Representatives from various EPA offices provided assistance with obtaining data,
selecting measures to be included in this initial report, and internal peer review. They
included the following:
• Office of Air and Radiation: Barry Gilbert, Brian Gregory, David Guinnup,
Wendy Kammer, David McKee, David Mintz
• Office of Children's Health Protection: Michael Firestone
• Office of Enforcement and Compliance Assurance: Sue Pohedra
• Office of Environmental Information: Rebecca Madison
• Office of Prevention, Pesticides, and Toxics Substances: Doreen Cantor,
Elizabeth Doyle, Tim Kiely, Joseph Merenda, Andy Privee, Martha Shimkin,
William Smith, David Widawsky, Pamela Wilkes
• Office of Research and Development: Jane Caldwell
• Office of Solid Waste and Emergency Response: Paul Balserak, David Bennett,
Rafael Gonzalez
• Office of Water: Rebecca Allen, Lee Kyle, Abraham Siegel, Elizabeth Southerland,
James Taft, Sherri Umansky
• Region 6: Evelyn Daniels
Other federal agencies that provided assistance with data and analysis included the following:
• National Center for Health Statistics, Centers for Disease Control and Prevention:
Lara Akinbami, Larry Edmonds, Clifford Johnson, Sherline Lee, Deborah Levey,
Sue Partridge, Diane Shinberg, Paula Yoon
• U.S. Census Bureau: Larry Sink
Abt Associates compiled much of the data analyzed for the report, under contract
with EPA. Abt's contributors to this report included Amy Benson, Jennifer Brady,
Kathleen Cunningham, Kenneth Davidson, Brad Firlie, Paul First, Rosaline Juan,
Emily King, Laura Kirk, Don McCubbin, Daniel McMartin, Suzanne Persyn,
Ellen Post, David Pulaski, and Andrew Stoeckle.
The following individuals served as external peer reviewers for the report: David Brown,
Northeast States for Coordinated Air Use Management; Patricia A. Buffler, University
of California, Berkeley; Gwen Collman, National Institute of Environmental Health
Sciences; Fernando Guerra, San Antonio Metropolitan Health District; Polly Hoppin,
U.S. Department of Health and Human Services; Phil Lee, University of California,
San Francisco; Maria Morandi, University of Texas, Houston; Swati Prakash and
Peggy Shepard, West Harlem Environmental Action; Kristin Ryan, Alaska Department
of Environmental Conservation; Ken Schoendorf and Diane Wagener, National Center
for Health Statistics, Centers for Disease Control and Prevention; Nadia Shalauta Juzych,
Michigan Public Health Institute; Daniel Swartz, Children's Environmental Health
Network; John Wargo, Yale School of Forestry and Environmental Studies; and
Cynthia Warrick, Howard University.
Acknowledgments
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Summary List of Measures
Name
Environmental Contaminants
Outdoor Air Pollution
Common Air Pollutants
Hazardous Air Pollutants
Indoor Air Pollution
Environmental
Tobacco Smoke
Drinking Water Contaminants
Drinking Water
Standards
Nitrates and Nitrites
Monitoring and Reporting
Pesticide Residues in Foods
Land Contaminants
Hazardous Waste Sites
Biomonitoring
Concentrations of Lead in Blood
Description of Measure Year(s)
Percentage of children living in areas in which air quality 1990 to 1998
standards were exceeded
Percentage of children's days with good, moderate, or 1990 to 1998
unhealthy air quality
Percentage of children living in counties where at least 1990
one hazardous air pollutant concentration was greater
than a health benchmark in 1990
Percentage of homes with children under 7 where 1994 to 1999
someone smokes regularly
Percentage of children living in areas served by public 1993 to 1998
water systems that exceeded a drinking water standard
or violated treatment requirements
Percentage of children living in areas served by public 1993 to 1998
water systems in which the nitrate/nitrite drinking
water standard was exceeded
Percentage of children living in areas with major 1993 to 1998
violations of drinking water monitoring and reporting
requirements
Percentage of fruits, vegetables, grains, dairy, and 1994 to 1998
processed foods with detectable pesticide residues
Percentage of children living in counties with 1990 to 2000
Superfund sites
Percentage of children living in counties that had 1990 to 2000
Superfund sites in 1990
Average concentrations of lead in blood for 1976 to 1994
children 5 and under
Percentage of children aged 1-5 with concentrations of 1992 to 1994
lead in blood greater than 10 ug/dl
America's Children and the Environment: A First View of Available Measures
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Summary List of Measures
Name
Childhood Diseases
Respiratory Diseases
Childhood Cancer
Description of Measure Year(s)
Percentage of children under 18 with asthma 1990 to 1996
and chronic bronchitis
Percentage of children under 18 with asthma, 1997-98 1997 to 1998
Asthma hospitalization rate for children 0-14 1987 to 1998
Cancer incidence and mortality for children under 20 1975 to 1995
Cancer incidence for children under 20 by type 1973 to 1996
Summary List of Measures
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About This Report
merica's Children and the Environment: A First View of Available Measures is the
U.S. Environmental Protection Agency's (EPA) first report on trends in measures
reflecting environmental factors that may affect the health and well-being of children in
the United States. This report represents an initial step in the identification, develop-
ment, and compilation of a set of measures that fully reflect environmental factors
important for children.
Developed by EPA's Office of Children's Health Protection in collaboration with EPA's
National Center for Environmental Economics in the Office of Policy, Economics and
Innovation, America's Children and the Environment presents measures that reflect
trends in levels of environmental contaminants in air, water, food, and soil; concentra-
tions of lead measured in children's bodies; and childhood diseases that may be influ-
enced by environmental factors.
As part of EPA's commitment to children's health, the Office of Children's Health
Protection and the National Center for Environmental Economics will continue to
work to obtain data needed for measures that more fully reflect how environmental
contaminants affect children's health.
What are the purposes of this report?
This report has two principal objectives. First, America's Children and the Environment
presents concrete, quantifiable measures for key factors relevant to the environment and
children in the United States. This initial work offers a basis for a better understanding
of time trends for some of these factors and for further investigation of others. The
authors and sponsors hope it will contribute to the effort to integrate the environmen-
tal health needs of children into the nation's policy agenda.
The second purpose of this report is to provide a starting point for discussions among
policymakers and the public about how to improve federal data on children and the
environment.
The long-term purpose of America's Children and the Environment is to identify or
develop measures that could be used by policymakers and the public to track and
understand the environmental health experience of children and, ultimately, to identify
and evaluate ways to improve it. The work involved in developing the measures for
children and the environment will contribute to this long-term goal.
How is the report structured?
The report first presents a series of measures and then discusses the direction of future work.
The first section of the report presents measures reflecting trends in levels of environ-
mental contaminants that are likely to affect children's health. These measures are
intended to show the percentage of children exposed to critical concentrations of con-
taminants in air, water, food, and soil. When data on actual environmental concentra-
tions of contaminants are not available, the report presents surrogate measures.
The second section presents measures that reflect trends in concentrations of key con-
taminants measured in children's bodies. Such data provide direct evidence of children's
exposures and can be tracked to determine whether childhood exposures are changing
over time.
America's Children and the Environment: A First View of Available Measures
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About This Report
The third section presents measures that reflect trends in certain childhood diseases, the
frequency or severity of which may be related to environmental factors. Information is pre-
sented about changes in the frequency of occurrence of these diseases over time.
The sections presenting measures are followed by a discussion of future directions,
including ways in which the existing measures could be improved, alternative data
sources, and measures that might be included in future versions.
Appendix A provides tables that summarize the data on which the measures were based,
and Appendix B describes the sources of the data used in this report and the construction
of the measures. Appendix C has a list of health goals relevant to the topics in this
report, developed by Healthy People 2010, a collaborative effort coordinated by the
U.S. Department of Health and Human Services to establish national health objectives.
Why did EPA focus on measures for children?
Children may be affected by environmental contaminants quite differently than adults
are, both because children may be more highly exposed to contaminants and because they
may be more vulnerable to the toxic effects of contaminants.
Children generally eat more food, drink more water, and breathe more air relative to
their size than adults do, and consequently may be exposed to relatively higher amounts
of contaminants in these media. Children's normal activities, such as putting their hands
in their mouths or playing on the ground, create opportunities for exposures to contami-
nants that adults do not face. In addition, environmental contaminants may affect chil-
dren disproportionately because their immune defenses are not fully developed or their
growing organs are more easily harmed.
To fully integrate the needs of children into the work of EPA and other agencies, it will
be helpful to define targets for research and for interventions to reduce contaminant
exposures and improve health.
In preparing this report, we have begun to assess the completeness of existing informa-
tion for each of the three major types of measures: levels of contaminants in the envi-
ronment, concentrations of contaminants in children's bodies, and frequency of key
childhood diseases. We also have assessed how well the data sources reflected the partic-
ular experience of children.
As would be expected in any first such endeavor, the analysis identified a number of
areas in which better or more appropriate data are needed. The assessment of priorities
for obtaining additional information is a continuing process that will be furthered by
review and reaction to the initial presentation in this report.
How were the measures in this report selected?
Three principal criteria were used to select measures for the report: importance to the
health of children, availability of data for much or all of the United States, and suffi-
cient quality of data to generate a reliable measure.
For environmental contaminants, we first identified five important media for children's
exposure: outdoor air, indoor air, drinking water, food, and soil. For each of these, we
reviewed the data sources available from federal environmental and health agencies and
selected the most informative sources that provided national coverage (or close to it) and
a reasonable assurance of reliability. If data about concentrations of key contaminants
About This Report
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About This Report
could be identified and were of adequate quality, we used that source. If not, we select-
ed the best available surrogate.
For concentrations of contaminants in children's bodies, we selected lead, a pollutant
long recognized as having major impacts on children's health, and obtained the best
available information about lead concentrations in the blood of children.
For childhood diseases associated with environmental factors, we initially selected the two
diseases identified as priorities by the Interagency Task Force on Environmental Health
Risks and Safety to Children, organized by EPA and the U.S. Department of Health and
Human Services: asthma and childhood cancer. We added an additional respiratory dis-
ease, chronic bronchitis, because it is associated with air pollution. We then identified the
best available data to assess time trends for the frequency of these diseases in children.
For each data source and topic, we structured the measures primarily to portray changes
over time. In future versions of this report, measures also may be designed to reflect
regional differences and ethnic and racial differences in effects or exposures.
What are the sources for the data in this report?
For most measures, federal agencies provided the data.
The data on environmental contaminants are from data systems maintained by EPA
and by state environmental agencies. The data on lead in blood and on respiratory dis-
eases are from the National Center for Health Statistics in the Centers for Disease
Control and Prevention. The data on cancer are from the National Cancer Institute.
County-level population data from the Census Bureau are used to calculate how many
children potentially were affected by environmental contaminants. Detailed descrip-
tions of the data sources may be found in Appendix B.
What groups of children are included in this report?
Most of the measures include all children in the United States under the age of 18.
Exceptions are noted in the descriptions of the measures.
What years are included in this report?
The report includes data for the 10 years from 1990 through 1999 whenever possible. In
many cases, data were available for only some of these years. In other cases, data available
before 1990 were included to provide an expanded depiction of trends.
What is the Office of Children's Health Protection at EPA?
The Office of Children's Health Protection (OCHP) supports and facilitates EPA's efforts to
protect children from environmental threats. OCHP's mission is to make the protection
of children's health a fundamental goal of public health and environmental protection in
the United States. OCHP reviews EPA proposals for their impact on children and funds
work designed to improve the protection of children from environmental hazards.
America's Children and the Environment: A First View of Available Measures
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About This Report
What are the Office of Policy, Economics and Innovation and
the National Center for Environmental Economics at EPA?
The Office of Policy, Economics and Innovation develops new approaches and provides
analysis to enable EPA to better address emerging environmental challenges. The office
addresses cross-cutting environmental management strategies, identifies emerging
issues, and acts as a catalyst for testing and institutionalizing integrative approaches to
environmental protection. Within the Office of Policy, Economics, and Innovation,
EPA's National Center for Environmental Economics (NCEE) provides economic and
health analysis of important environmental issues for the regulatory and policy process.
NCEE also conducts research that will improve our current understanding of the
impacts of environmental contaminants on public health. NCEE's staff includes spe-
cialists in air, water, solid waste, cross-media economics, and children's health risks. The
center's health scientists emphasize new methods for assessing previously unidentified
risks, assessing relationships between exposures and disease, and developing tools to
communicate this information to the public.
About This Report
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Key Findings
Part I:
Environmental
Contaminants
Outdoor Air Pollution
• Between 1990 and 1998, the percentage of children living in counties where one or
more of the six criteria air pollutants (ground-level ozone, particulate matter, carbon
monoxide, lead, sulfur dioxide, and nitrogen dioxide) exceeded national air quality
standards decreased from 28 percent to 24 percent, although it fluctuated from a
high of 32 percent to a low of 17 percent.
• The percentage of children's days with unhealthy air quality decreased between
1990 and 1998, dropping from 4 percent in 1990 to less than 2 percent in 1998.
• In 1990, 100 percent of America's children lived in counties in which a l-in-100,000
benchmark for cancer risk was exceeded by at least one hazardous air pollutant. In
the same year, 6 percent of children lived in counties in which a l-in-10,000 cancer
risk benchmark was exceeded by at least one hazardous air pollutant. Also in the
same year, nearly 95 percent of children lived in counties in which a benchmark for
non-cancer health effects was exceeded by at least one hazardous air pollutant.
Indoor Air Pollution
• The percentage of homes with children under 7 in which someone regularly smokes
declined from 29 percent in 1994 to 19 percent in 1999.
Drinking Water Contaminants
• Between 1993 and 1998, the percentage of children living in areas served by
public water systems in which a drinking water standard for chemicals, radiation,
or microbial contaminants was exceeded, or treatment rules were violated, decreased
from 19 to 8 percent.
• Between 1993 and 1998, the number of children served by a public water system in
which the nitrate or nitrite drinking water standard was exceeded decreased by close
to 20 percent.
• The percentage of children living in areas served by public water systems with at
least one major monitoring or reporting violation dropped from 21 percent in 1993
to 10 percent in 1998.
Pesticide Residues in Foods
• Of the fruits, vegetables, grains, dairy, and processed foods tested by the U.S.
Department of Agriculture's Pesticide Data Program, 62 percent showed detectable
pesticide residues in 1994. This number decreased to 55 percent in 1998 but
fluctuated in the interim years.
Part II:
Biomonitoring
Concentrations of Lead in Blood
• Average concentrations of lead in the blood of children aged 5 and under dropped
78 percent from 16.5 micrograms per deciliter in 1976-80 to 3.6 in 1992-94. The
decrease is largely attributed to the elimination of leaded gasoline between 1973
and 1995.
• Between 1992 and 1994, approximately 1.5 million children aged 17 and younger
had elevated blood lead levels (higher than 10 micrograms per deciliter).
America's Children and the Environment: A First View of Available Measures
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Key Findings
Race and poverty affect a child's likelihood of having elevated concentrations of lead
in his or her blood. Children living in families with incomes below the poverty line
are more likely to have elevated blood lead levels. Black children are more likely to
have elevated levels than white non-Hispanic and Hispanic children.
Respiratory Diseases
• The prevalence of asthma among children in the United States increased 75 percent
between 1980 and 1994. In 1990, 5.8 percent of children had asthma, increasing to
7.5 percent in 1995.
• In 1997-98, 8.3 percent of non-Hispanic Black children living in families with
incomes below the poverty level had asthma, the highest for all racial groups and
income levels.
• The frequency of asthma hospitalizations for children aged 0 to 14 fluctuated
between 1987 and 1998. In 1987, the frequency was 284 hospitalizations per year
per 100,000 children. The frequency increased to 369 per 100,000 in 1995 and
then dropped to 277 per 100,000 in 1998.
Childhood Cancer
• The frequency of cancer in childhood increased from 130 cases per million children
in 1975 to 150 cases per million in 1995, though this increase appears to have
leveled off since 1990.
• While the frequency of childhood cancer has increased, the number of deaths from
cancer in children has declined significantly since 1972. The decline in deaths is
largely due to significant improvements in treatment for many forms of cancer in
children.
• Between 1973 and 1996, leukemia was the cancer most commonly diagnosed among
children and represented 25 percent of cases. The frequency of acute lymphoblastic
leukemia increased moderately from 23 cases per million in 1973-1978 to
approximately 27 cases per million in 1991-1996. The frequency of acute myeloid
leukemia has remained stable.
Part III: Childhood
Diseases
Key Findings
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PARTI
Environmental
Contaminants
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Part I:
Environmental
Contaminants
his section of the report presents measures reflecting levels of contaminants of
concern for children and how these levels have changed over time. Many differ-
ent substances can affect the health of children. Children may come into contact with
harmful pollutants in air, water, food, and soil. Tracking the levels of these pollutants is
an important step toward ensuring that environmental policies protect children.
This section includes measures for contaminants in outdoor air, indoor air, drinking water,
food, and soil. Most of the measures show the percentages of children who may be at risk
from exposure to critical concentrations of pollutants.
Ideally, the report would include measures that reflect trends in concentrations of all
important pollutants in all relevant exposure media. However, data of this type are not
available for the most part, and the measures in this section are based largely on surro-
gates for such data.
The measures in this section do not account for some forms of environmental contami-
nants that also are important for children but are less amenable to measurement and
data collection at a national scale. These include contaminants in dusts and soils in and
near homes. Also, the measures do not include exposures through breast-feeding or
exposures that occur prenatally.
The Future Directions section (see page 57) describes additional information that would
be important to assess potential environmental threats to children fully, as well as ways
in which existing data systems might be improved to provide better information for
assessments.
Within Part I, the data used to develop measures of pollutants in outdoor air are the
most complete. Information about the six most common outdoor air pollutants (often
called the criteria pollutants) is available for nine of the 10 target years for this report.
The data used are close surrogates for measured concentrations of pollutants, as they
indicate whether air quality standards for pollutants were exceeded. Data for some pol-
lutants are available for the vast majority of counties, though data for all six pollutants
are available for relatively few counties due to limitations in monitoring networks. The
criteria air pollutant measures thus represent all six of the relevant pollutants, provide
very good coverage of the target time period, and offer fairly good but not complete
coverage of the counties of the United States.
For hazardous outdoor air pollutants, the analysis includes data for one year, 1990. The
data used to generate the measure are estimates of ambient concentrations of 148 pol-
lutants—most of the pollutants identified as hazardous air pollutants under the Clean
Air Act—for all counties in the contiguous United States.
For indoor air, this initial report includes one pollutant: environmental tobacco smoke.
Many other important pollutants, including combustion products and volatile organic
compounds, would be relevant to include if data could be identified. The measure used in
this report is a surrogate for measured concentrations of environmental tobacco smoke in
the home, as it is based on a survey that collected nationally representative data in 1994,
1996, and 1999 about the number of homes with young children in which people smoke.
America's Children and the Environment: A First View of Available Measures
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For drinking water, the report uses surrogate measures for concentrations of contaminants
in drinking water, relying on reported violations of drinking water standards for a wide
variety of chemicals, physical agents such as radiation, and microbes such as bacteria and
viruses. The measures also show trends for violations of rules for treatment of drinking
water. The coverage of the measures in this section is fairly complete in terms of geo-
graphic areas, years of available data, and chemicals included. However, the reports of vio-
lations of standards are incomplete due to monitoring and reporting limitations.
For food, this report presents a measure of the frequency with which detectable levels
of pesticides were found in fruits, vegetables, and other foods from 1994-1998. This
measure is a surrogate for concentrations of pesticides in foods. The measure has fairly
complete national coverage and is available for several years within the target range.
However, it does not distinguish among different pesticides or among different foods
with pesticide residues. Some pesticides may pose greater risks to children than others
do, and residues on some foods may pose greater risks than residues on other foods.
Moreover, the measure does not include many contaminants in food that are relevant
to children, such as mercury.
For soil, little or no information about contaminants is available at a national scale. The
report includes a surrogate measure based on the location of Superfund hazardous waste
sites. This measure provides good coverage in that data are available for all counties for
1990-2000, but the measure is recognized to have significant limitations.
Part I: Environmental Contaminants
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Outdoor Air Pollution
Common Air
Pollutants
Air pollution contributes to a wide variety of health effects, though most of the evidence
for health impacts is from studies on adults. The most common air pollutants—ground-
level ozone, paniculate matter, carbon monoxide, lead, sulfur dioxide, and nitrogen
dioxide—are regulated by EPA and the individual states. These pollutants often are
called criteria pollutants.
Several of these pollutants, including ozone and particulate matter, have been associated
with increases in respiratory-related diseases in children, including reduction of lung
function, increases in respiratory symptoms, and increased severity or frequency of
asthma attacks.1"'1 Lead damages the central nervous system in children. Higher con-
centrations of particulate matter increase mortality in the general population.10"11
EPA sets National Ambient Air Quality Standards for each of these pollutants to pro-
tect people from adverse health effects. The standards specify how much of each pollu-
tant is allowed in the air. Some of the standards are designed to protect the public from
adverse health effects that can occur after being exposed for a short time, such as one
hour or one day. Other standards are designed to protect people from health effects
that can occur after being exposed for a much longer time, such as a year. For example,
current standards for carbon monoxide are for periods of one hour and eight hours,
while the current standard for nitrogen dioxide is for one year. The standards and the
varying time periods for which they apply are shown in Appendix B as Table 1.
Air Quality State agencies that monitor air quality report their results to EPA, which then reports
EXCGGdanCGS instances in which the measured concentration of a pollutant exceeds the standard for
a YGar t^lat p°Uutant- A description of the methods used to determine whether an exceedance
has occurred is available in Appendix B.
For this measure, we used EPA's results showing when air quality standards were exceeded
in counties in the United States. We calculated the percentage of children living in areas
with reported exceedances for the six criteria pollutants. This measure shows the percent-
age of children that may be exposed to poor air quality at some point during a year.
This measure does not differentiate between areas in which standards are exceeded
frequently or by a large margin and areas in which standards are exceeded only rarely
or by a small margin. Also, because the nature of health effects varies significantly and
the averaging times associated with different standards vary widely, exceedances for dif-
ferent standards are not comparable. For example, the ozone standard considers meas-
ured levels of ozone within a one-hour period and health effects such as lung function
decrements, respiratory symptoms, and hospital admissions. In contrast, the averaging
time for the lead standard is three months and is based on health effects such as IQ
decrements and hypertension.
Healthy People 2010: Objective 8-01 of the Healthy People 2010 initiative aims to reduce the
number of people exposed to air that fails to meet EPA's health-based
standards for criteria air pollutants. See Appendix C for more information.
America's Children and the Environment: A First View of Available Measures
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Outdoor Air Pollution
Measure El
Percentage of children living in counties in which air quality
standards were exceeded
5%
0%
Lead
1990 1991
1990 1991 1992 1993 1994 1995 1996 1997 1998
SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Aerometric Information Retrieval System.
From 1990 through 1998, approximately 25 percent of children lived in a county
in which at least one air quality standard was exceeded during the year.
The highest number of exceedances was for ozone. In 1990, approximately 23 percent
of children lived in counties in which the ozone standard was exceeded on at least one
day. In 1998, approximately 21 percent of children lived in such counties.
In 1990, approximately 10 percent of children lived in counties in which the
carbon monoxide standard was exceeded. In 1998, approximately 4 percent of
children lived in such counties.
From 1990 to 1998, the percentage of children living in counties that exceeded the
daily standard for particulate matter fluctuated, but was as high as 10 percent in
1992 and 1995.
On average, 2 percent of children lived in counties that exceeded the standard for
lead. The main sources of ambient concentrations of lead are metals processors,
such as smelters, and battery manufacturers.12
No exceedances of the nitrogen dioxide standard have occurred since 1991.
However, the nitrogen dioxide standard is based on measurements over a full year
and therefore is not comparable to the other standards included here. Also, few
exceedances of the sulfur dioxide standard have occurred since 1993. Consequently,
these two pollutants are not included on the graph.
Part I: Environmental Contaminants
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Outdoor Air Pollution
Daily Air Quality EPA provides an Air Quality Index (AQI) that offers useful information about air qual-
ity. The purpose of the AQI is to help individuals understand what local air quality
means to their health. The AQI is like a yardstick: the higher the AQI value, the greater
the level of air pollution and the greater the danger to health.
The AQI is based on measurements of up to five of the six air quality criteria pollutants
(carbon monoxide, ozone, nitrogen dioxide, sulfur dioxide, and particulate matter). The
AQI is a measure of air quality for each day. An AQI value of 100 for a given criteria
pollutant generally corresponds to the national ambient air quality standard (NAAQS)
for that pollutant and the level EPA has set to protect public health for that pollutant
on a single day.
EPA has divided the AQI scale into categories. Air quality is considered "good" if the
AQI is between 0 and 50. At this level, air quality is satisfactory and air pollution poses
little or no risk over the short term. Air quality is considered "moderate" if the AQI is
between 51 and 100. Air quality at this level is acceptable, but some pollutants may
present a moderate health concern for a very small number of individuals. Moreover,
such a level may pose health risks if maintained over many days. Air quality is consid-
ered "unhealthy for sensitive groups" if the AQI is between 101 and 150. Members of
sensitive groups such as children may experience health effects, but the general public is
not likely to be affected. Air quality is considered "unhealthy" if the AQI is between
151 and 200. The general population may begin to experience health effects, and
members of sensitive groups may experience more serious health effects.
Measure E2 on the following page uses the reported AQI for the counties of the United
States. This measure was developed by reviewing the air quality designation for each
day for each county. The daily designations were weighted by the number of children
living in each county. The resulting measure may be considered to be reported in
"child-days," where the designation for each day for each child in a county is counted
toward the total. This measure reflects the number of days that children live in a coun-
ty with air quality in each category.
The advantage of this approach, compared with that used in measure El on the previous
page, is that it provides a sense of the intensity of pollution over the course of a year.
This method provides data on the air quality category for each day, rather than simply
reporting whether a county ever exceeds standards for these pollutants.
The limitation of this method is that the AQI is based on the single pollutant with the
highest value for each day; it does not reflect any combined effect of multiple pollu-
tants. It reflects short-term, daily pollution burdens and is not well suited for reporting
concentrations of lead and nitrogen dioxide because these pollutants do not have one-
day standards. This approach is influenced by the frequency of measurements. Because
the AQI is reported daily, pollutants that are measured daily—such as ozone—will
appear to have more effect than those that are measured less frequently, such as panicu-
late matter.
America's Children and the Environment: A First View of Available Measures
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Outdoor Air Pollution
Measure E2
Percentage of children's days with good, moderate, or
unhealthy air quality
50%
40%
30%
20%
Moderate
No Monitoring Data
•
Unhealthy
1990
1991
1992
1993
1994
1995
1996
1997
1998
SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Aerometric Information Retrieval System.
The percentage of children's days that were designated as having "unhealthy" air
quality decreased between 1990 and 1998, dropping from 4 percent in 1990 to less
than 2 percent in 1998. The percentage of children's days that were designated as
having "moderate" air quality remained about the same between 1990 and 1998, at
about 27 percent.
The coverage of monitoring for this measure was largely unchanged between 1990
and 1998. Approximately 10 percent of children's days of exposure to air pollutants
were not monitored at all. Even on days that were monitored, in many cases only one
or a few pollutants were monitored. Areas that do not have monitors may be expected
to have good air quality, but we do not have monitoring data to verify this.
Part I: Environmental Contaminants
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Outdoor Air Pollution
Hazardous Air
Pollutants
Hazardous air pollutants, also known as air toxics, have been associated with a number
of adverse human health effects, including cancers, asthma and other respiratory ail-
ments, and neurological problems such as learning disabilities and hyperactivity.13"17
Examples of the 188 hazardous air pollutants listed in the Clean Air Act include ben-
zene, trichloroethylene, mercury, chromium, and dioxins. Ambient concentrations
result from emissions by local or regional sources such as chemical manufacturing
plants, refineries, waste incinerators, electricity generating plants, dry cleaners, cars,
trucks, and buses. For some hazardous air pollutants, ambient concentrations also
result from emissions that occurred in past years or from natural sources.
Unlike the criteria air pollutants, there are no national air quality standards for hazardous
air pollutants that can be used to construct a health-based measure. Instead, we have
compared ambient concentrations of hazardous air pollutants with health benchmark
concentrations derived from scientific assessments conducted by EPA and other environ-
mental agencies.13'18"20
Hazardous Air
Pollutants and
Health Benchmarks
For this analysis we used four different health benchmark concentrations. Three bench-
marks reflect potential cancer risks, at levels of one-in-a-million risk, l-in-100,000 risk,
and l-in-10,000 risk. If a particular hazardous air pollutant is present in ambient air at
a one-in-a-million benchmark concentration, for example, one additional case of cancer
would be expected in a population of one million people exposed for a lifetime. The
fourth benchmark concentration corresponds to the level at which a hazardous air pol-
lutant may be associated with human health effects other than cancer.
The four benchmarks generally reflect expected effects in adults, rather than potential
risks to children or risks in adulthood stemming from childhood exposure. Benchmarks
are not available to reflect these concerns.
The estimates of ambient concentrations of air toxics for the year 1990 were computer-
generated. The computer model provided estimates for every county in the continental
United States. The computer estimates are consistent with the limited set of actual meas-
urements of ambient air toxics concentrations available for 1990.
This measure only considers exposures to air toxics that occur by inhalation. An impor-
tant additional pathway of exposure to many air toxics is through deposition of those
pollutants to land and water, and subsequent accumulation in the food chain. For haz-
ardous air pollutants that are persistent in the environment, exposures through food
consumption typically are greater than inhalation exposures. Hazardous air pollutants
for which these food chain exposures are important include mercury and other haz-
ardous air pollutants that can damage a child's nervous system.21"23
Healthy People 2010: Objective 8-04 of the Healthy People 2010 initiative focuses on reducing
emissions of hazardous air pollutants. See Appendix C for more information.
America's Children and the Environment: A First View of Available Measures
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Outdoor Air Pollution
Measure E3
Percentage of children living in counties where at least one
hazardous air pollutant concentration was greater than a
health benchmark in 1990
Cancer Benchmark:
One-in-a-Million
Cancer Benchmark:
1-in-l 00,000
Cancer Benchmark:
1-in-l 0,000
Benchmark for
other health effects
SOURCE: U.S. Environmental Protection Agency, Cumulative Exposure Project.
In 1990, all children lived in counties in which the one-in-a million and 1-in-
100,000 cancer risk benchmarks were exceeded by at least one hazardous air
pollutant. Six percent of children lived in counties in which at least one hazardous
air pollutant exceeded the 1-in-l0,000 benchmark.
Approximately 95 percent of children lived in counties in which the benchmark for
health effects other than cancer was exceeded by at least one hazardous air pollutant.
Actual exposures may differ from ambient concentrations. Indoor concentrations of
hazardous air pollutants from outdoor sources may be slightly lower than ambient
concentrations, though they can be significantly higher if any indoor sources are
present. Levels of some hazardous air pollutants may be substantially higher inside
cars and school buses, and those higher levels would increase the risks.
In the upcoming year, as part of its National Air Toxics Assessment (NATA)
activities, EPA will finalize a national-scale assessment of hazardous air pollutant
risks for the year 1996 (see ww.epa.gov/ttn/uatw/nata for a complete description).
In the future, measures of hazardous air pollutant risks to children will be developed
using information from NATA, which will be updated every three years.
Part I: Environmental Contaminants
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Indoor Air Pollution
Environmental
Tobacco Smoke
Children can be exposed to a number of air pollutants inside homes, schools, and other
buildings. Some of these pollutants come from indoor sources, including emissions
from combustion sources such as gas stoves, fireplaces, and secondhand tobacco smoke;
off-gassing from building materials such as treated wood and paints, furnishings, carpet,
and fabrics; and consumer products such as sprays, window cleaners, and laundry soap.
Exposure to environmental tobacco smoke has been recognized as an important health
risk for children and is included in this report. Information on the toxic effects of other
important indoor pollutants indicates that they could pose health risks to children.
We will continue to explore data sources for other indoor air pollutants to include in
future reports.
Children who are exposed to environmental tobacco smoke, also known as secondhand
smoke, are at increased risk for a number of adverse health effects, including lower respi-
ratory tract infections, bronchitis, pneumonia, fluid in the middle ear, asthma symp-
toms, and sudden infant death syndrome (SIDS).25"28 Exposure to environmental tobac-
co smoke also may be a risk factor contributing to new cases of asthma.25' 29"30 Young
children appear to be more susceptible to the effects of environmental tobacco smoke
than older children are.25
Smoking in the Home
Environmental tobacco smoke in the home is an important source of exposure because
children spend most of their time at home and indoors. This report's measure for envi-
ronmental tobacco smoke is the percentage of homes with children under 7 in which
someone smokes regularly. This measure is a surrogate for the exposure of children to
tobacco smoke, and the data are based on a national survey. Data are available for three
of the 10 target years. The measure reflects the percentage of homes, rather than chil-
dren, although it is expected that the two would track closely.
Healthy People 2010: Objective 27-09 of the Healthy People 2010 initiative seeks to reduce
the percentage of children regularly exposed to secondhand smoke.
See Appendix C for more information.
America's Children and the Environment: A First View of Available Measures
-------
Indoor Air Pollution
Measure E4
Percentage of homes with children under 7 where someone
smokes regularly
35%
30%
25%
20%
15%
10%
5%
1994
1996
1999
SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Indoor Environments Division, Surveys on
Radon Awareness and Environmental Tobacco Issues.
The percentage of homes with children under 7 in which someone smokes on a regular
basis decreased from 29 percent in 1994 to 19 percent in 1999.
The percentage of homes with children under 7 in which someone is a smoker is greater
than the percentage in which someone is allowed to smoke in the home.
Most often the smoker in the home is one of the parents.
The decline in the percentage of children exposed to environmental tobacco smoke
in the home is similar to the decline in the percentage of adults who smoke.
Part I: Environmental Contaminants
-------
Drinking Water Contaminants
The contaminants in drinking water are quite varied and can cause a range of diseases
in children, including cancer, developmental effects such as learning disorders, and
acute diseases such as gastrointestinal illness. Children are particularly sensitive to
microbial contaminants because their immune systems may be less well developed than
those of most adults. Children are sensitive to lead, which affects brain development,
and to nitrates, which can cause methemoglobinemia (blue baby syndrome).
EPA sets drinking water standards for public water systems, referred to as Maximum
Contaminant Levels (MCLs). These standards are designed to protect against adverse
health effects from contaminants in drinking water while taking into account technical
feasibility of meeting the standard. MCLs have been adopted for more than 80 microbial
contaminants, chemicals, and radionuclides. EPA also adopts standards for the protection
of drinking water sources and for the treatment of drinking water to increase its safety.
An important treatment-related standard, the Surface Water Treatment Rule, requires
treatment of surface water by filtration to remove contaminants.
In 1998, EPA established more stringent filter performance requirements to further
strengthen microbial protection. In the same year, EPA also established new drinking
water standards for disinfection byproducts, exposure to which has been associated with
long-term bladder cancer and possible reproductive effects. Most recently, EPA finalized
standards protecting against radionuclides in drinking water. Because these standards
have been promulgated only recently, this report does not reflect the increased public
health protection achieved through their implementation.
Exceedances of
Drinking Water
Standards
One way to measure children's risk of exposure to contaminated drinking water is to
identify public water systems that contain contaminants at levels greater than those
allowed by the drinking water standards. Ideally, we would look at data on concentra-
tions of all of the chemical and microbial contaminants in all public drinking water
systems and identify any areas of risk for children. This is not currently possible, for
two reasons. First, the national data systems for drinking water do not track concentra-
tions of contaminants in drinking water, but rather the frequency with which standards
are exceeded. Second, the information on violations is incomplete because not all pub-
lic water systems fully monitor contaminants or report their monitoring results. (We
do, however, have some data that identify the public water systems that do not monitor
or report their results.)
We can use information about violations as a surrogate for exposure to unacceptably
high levels of drinking water contaminants. We also need to consider information
about water systems that do not monitor or report results, because we do not know
with certainty whether populations served by these systems are at risk.
Data are available only for public water systems. Approximately 42 million people are
served by private drinking water systems, which are not required to monitor and report
the quality of drinking water. We do not have information to indicate whether these
people are at risk.
Healthy People 2010: Objective 8-05 of the Healthy People 2010 initiative seeks to increase the
number of people served by community water systems that meet the
regulations of the Safe Drinking Water Act. See Appendix C for more
information.
America's Children and the Environment: A First View of Available Measures
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Drinking Water Contaminants
Measure E5
20%
18%
6%
4%
2%
0%
Percentage of children living in areas served by public water
systems that exceeded a drinking water standard or violated
treatment requirements
All Health-based Violations
Treatment and Filtration
1993 1994
1993 1994 1995 1996 1997 1998
SOURCE: U.S. Environmental Protection Agency, Office of Water, Safe Drinking Water Information System.
The percentage of children served by public water systems that exceeded a Maximum
Contaminant Level or violated a treatment standard decreased from 19 percent in
1993 to 8 percent in 1998.
Every category of violation decreased between 1993 and 1998. The largest decline
was for violations of the microbial contaminants standards.
A violation of "treatment and filtration" is defined as any failure in the treatment
process, or in operation and maintenance activities, or both, that may affect water
quality. EPA has a rule that specifies the type of treatment and maintenance activities
that systems must use to prevent microbial contamination of drinking water.
Data on violations reported to the federal government are of generally high quality.
However, many public water systems fail to report all violations. A recent review of
the data concluded that 68 percent of the microbial contaminant violations are
reported, 19 percent of the violations for other contaminants are reported, and
11 percent of the treatment and filtration violations are reported.31
Part I: Environmental Contaminants
-------
Drinking Water Contaminants
NJtratGS and NitNtGS High levels of nitrites or nitrates in the water supply can interfere with infants' ability
to absorb oxygen and can lead to "blue-baby" syndrome (methemoglobinemia), which
can result in death. EPA has set drinking water standards for nitrates and nitrites.
The percentage of children living in areas served by public water systems that violate
these standards can be used as a measure of risk of exposure to nitrates and nitrites.
However, some families are served by water supplies, such as wells, that are not includ-
ed in this measure because they are not part of public water systems and are not subject
to monitoring. Many people served by private water supplies live in rural and agricul-
tural areas, and may be at particular risk. Fertilizer and livestock manures are significant
contributors of nitrates and nitrites in groundwater supplies of drinking water.
America's Children and the Environment: A First View of Available Measures
-------
Drinking Water Contaminants
Measure E6
Percentage of children living in areas served by public water
systems in which the nitrate/nitrite standard was exceeded
°'°% 1993 1994 1995 1996 1997 1998
SOURCE: U.S. Environmental Protection Agency, Office of Water, Safe Drinking Water Information System.
In 1993, approximately 147,000 children were served by public water systems that
violated the nitrate or nitrite standard. In 1998, 117,000 children were served by
systems that violated the nitrate or nitrite standard.
The primary sources of nitrates include livestock manure (especially from feedlots),
fertilizers, and human sewage.
Part I: Environmental Contaminants
-------
Drinking Water Contaminants
3nd Public water systems are required to monitor for contaminants and report violations of
drinking water standards to EPA. However, not all public water systems conduct all
required monitoring and report violations. Such water systems violate monitoring and
reporting requirements.
Some monitoring and reporting violations, such as late reporting, are minor. But some
water systems have major violations, such as failing to collect any water samples during a
specified monitoring period. Children that live in areas that are not adequately monitoring
for water contaminants may be at risk, but the extent of the risk is unknown.
America's Children and the Environment: A First View of Available Measures
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Drinking Water Contaminants
Measure E7
Percentage of children living in areas with major violations of
drinking water monitoring and reporting requirements
Microbial Contaminants
•
Treatment and Filtration
SOURCE: U.S. Environmental Protection Agency, Office of Water, Safe Drinking Water Information System.
In 1993, approximately 21 percent of children lived in an area served by a public
water system that had at least one major monitoring and reporting violation. This
figure decreased to about 10 percent in 1998.
The largest number of monitoring and reporting violations occurred for the lead and
copper standards. Approximately 11 percent of children in 1993 were served by
public water systems with monitoring and reporting violations for lead and copper,
decreasing to about 5 percent in 1995. The number has remained constant since then.
The percentage of children who live in areas with a major chemical and radiation
monitoring violation declined from approximately 9 percent in 1993 to about 2
percent in 1998.
Part I: Environmental Contaminants
-------
Pesticide Residues in Foods
Most of the food produced for human consumption is grown using pesticides.
Chemical control of weeds, insects, fungi, and rodents has enabled agricultural produc-
tivity and intensity to increase. However, these economic benefits are not without their
risks to human and environmental health. Small amounts of some pesticides may
remain as residues on fruits, vegetables, grains, and other foods. If exposures are great
enough, many pesticides may cause harmful health effects, including delayed or altered
development, cancer, acute and chronic injury to the nervous systems, lung damage,
reproductive dysfunction, and possibly dysfunction of the endocrine (hormone) and
immune systems.32-33
Children's exposures to pesticide residues may be relatively higher than those of most
adults. Pound for pound, children generally eat more than adults, and they may be
exposed more heavily to certain pesticides because they consume a diet different from
that of adults.34 For instance, children typically consume larger quantities of apple-
sauce, milk, and orange juice per pound of body weight.
Protecting the food supply from harmful levels of pesticide residues requires the ongo-
ing attention of government agencies, pesticide producers, and pesticide users. The
U.S. Department of Agriculture (USDA) collects annual data on pesticide residues in
food. Among the foods sampled by the USDA's Pesticide Data Program in recent years
are several that are important parts of children's diets, including apples, apple juice,
bananas, carrots, green beans, orange juice, peaches, pears, potatoes, and tomatoes. EPA
evaluates the safety of all new and existing pesticides and restricts pesticide use to those
applications that do not pose unacceptable human health or ecological risks.
Pesticides are not the only contaminants in food that may affect children's health adversely.
Industrial contaminants (such as dioxins, PCBs, and mercury), microbial contaminants
(such as E. coli), and natural contaminants (such as aflatoxin) also can be found in foods.
The Pesticide Data Program does not analyze foods for the presence of these types of con-
taminants, although other government programs monitor for some of them.
The chart on the following page displays the percentage of foods with detectable pesti-
cide residues reported by the PDP from 1994 to 1998.35"36 This measure is a surrogate
for children's exposure to pesticides in foods: If the frequency of detectable levels of pes-
ticides in foods decreases, it is likely that exposures will decrease. However, this measure
does not account for many additional factors that affect the risk to children. For exam-
ple, some pesticides may pose greater risks to children than others do; residues on some
foods may pose greater risks than residues on other foods due to differences in amounts
consumed. For some pesticides, residues at levels below detection limits may pose
important risks, while for other pesticides detectable levels of residues may not pose a
significant health concern. In addition, year-to-year changes in the percentage of samples
with detectable pesticide residues may be affected by changes in the selection of foods
that are sampled each year.
America's Children and the Environment: A First View of Available Measures
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Pesticide Residues in Foods
Measure E8
Percentage of fruits, vegetables, grains, dairy, and processed
foods with detectable pesticide residues
80%
70%
60%
50%
40%
30%
20%
10%
0%
All Food Samples
with Pesticide
Residues Detected
Food Sam Dies with
Residues of Multiple
Pesticides Detected
Food Samples with
a Single Pesticide
Detected
1994
1995
1996
1997
1998
SOURCE: U.S. Department of Agriculture, Agricultural Marketing Service, Pesticide Data Program Annual Summary
(Calendar Years 1993-1998).
In 1994, 62 percent of all food samples tested by the U.S. Department of
Agriculture's Pesticide Data Program (PDP) had detectable levels of at least one
pesticide. The proportion of samples with detections increased to 68 percent in
1996, then declined to 55 percent in 1998.
In 1998, 29 percent of samples had detectable levels of multiple pesticides,
compared with 36 percent in 1994. During the same period, the proportion of
samples with detectable levels of a single pesticide remained relatively constant.
PDP data from 1994-96 were further evaluated for the presence of pesticides in 19
foods frequently eaten by children. This analysis focused on detections of
carcinogenic and neurotoxic pesticides. Twenty-five percent of the samples had
detectable levels of carcinogenic pesticides, and 34 percent had detectable levels of
neurotoxic pesticides (not shown).
Each year, less than 0.2 percent of all sampled foods had residues that violated
established tolerances. A tolerance is the amount of pesticide residue legally allowed
to remain on a food commodity.
Part I: Environmental Contaminants
-------
Land Contaminants
Hazardous
Waste Sites
Abandoned and uncontrolled hazardous waste sites may pose risks to children who play
in or near them, and the sites also may cause pollution of drinking water, ambient air,
and foods. Superfund is the federal government's program to clean up these sites. EPA's
principal mechanism for placing sites on Superfund's National Priorities List (NPL) is a
scoring system that uses information from initial, limited investigations to assess the
relative potential of sites to pose a threat to human health or the environment.
Sites with scores indicating a high risk potential are proposed for addition to the NPL.
EPA then accepts public comments on the sites, responds to the comments, and final-
izes the listing for those sites that continue to meet the requirements for addition to the
list. Sites on the NPL are studied in detail and cleaned up as necessary. Sites are deleted
from the list when EPA determines that no further response is required to protect
human health or the environment.
Sites at which substantial cleanup work has been completed may be designated as hav-
ing reached "Construction Completion." This means that any physical construction
necessary to reduce potential exposures has been completed, and other controls are in
place to prevent exposure while final cleanup levels are being achieved. Construction
Completion represents a level of site remediation at which potential exposures have
been significantly reduced, although additional cleanup work remains.
Residence in a county where a Superfund site is located is a surrogate measure for poten-
tial exposure to contaminants found at these sites. This measure has complete national
coverage and includes data for multiple years. The limitations of this measure are that
some children living in counties with Superfund sites may live many miles away from
those sites, in which case the potential for exposure could be low. Also, the hazards
posed to children may vary significantly across the different Superfund sites.
Healthy People 2010: Objective 8-12 of the Healthy People 2010 initiative addresses the mitiga-
tion of hazardous waste sites on the National Priority List. See Appendix C
for more information.
America's Children and the Environment: A First View of Available Measures
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Land Contaminants
Measure E9
Percentage of children living in counties with Superfund sites
All Superfund Sites That Have Not Yet
Reached "Construction Completion'
0%
1990 1992 1994 1996 1998
SOURCE: Environmental Protection Agency, Superfund NPL Assessment Program (SNAP) Database.
About 58 percent of children lived in counties with Superfund sites as of August
2000. This figure represents an increase from approximately 55 percent in 1990.
The increase is due to the addition of sites to the list through the 1990s as initial
evaluations were completed. The soil at these newly listed sites probably has been
contaminated for many years, so the increase in the percentage of children living in
counties with Superfund sites does not necessarily reflect an increase in hazards to
children in recent years.
Sites that have reached "Construction Completion" are expected to pose a
substantially reduced hazard. When only the Superfund sites that have not reached
this milestone are considered, the percentage of children living in counties with
hazardous waste sites has declined from 55 percent in 1990 to 50 percent in 2000.
More than 750 out of the 1,500 sites on Superfund's National Priorities List (NPL)
have reached Construction Completion. Of these, cleanup has been completed at
more than 200 sites and they have been removed from the NPL.
Part I: Environmental Contaminants
-------
Land Contaminants
Hazardous Waste
Sites Listed
as of 1990
Another way to look at trends in children potentially affected by Superfund sites is to
focus only on changes in those sites that were on Superfund's National Priorities List
(NPL) at the end of fiscal year 1990. As noted above, the analysis based on the entire
NPL may be misleading, because the addition of sites to the NPL in recent years does
not necessarily mean that risks have increased. Most of the newly listed sites have been
contaminated for many years, and their addition to the NPL in the 1990s means only
that EPA has recognized the contamination and that the administrative processes
required for listing have been completed.
For this alternative analysis, we disregard sites added to the NPL since 1990 and con-
sider only those sites that were listed by September 30, 1990. We then track the sites
that remain on the NPL in subsequent years—i.e., the sites at which remediation was
not complete as of 1992, 1994, etc. Both final remediation and cleanup (which results
in deletion from the NPL) and "Construction Completion" (which indicates significant
reductions in potential exposures) are considered.
This analysis provides an indication of progress in remediation at those sites that were
included on the NPL in 1990. The limitation of this measure is similar to that of the
previous Superfund measure in that both measures only present the number of children
living in counties with Superfund sites. The hazards posed by any Superfund site may be
localized and therefore may not affect many residents of the county in which it is located.
America's Children and the Environment: A First View of Available Measures
-------
Land Contaminants
Measure E10
70%
60%
50%
40%
Percentage of children living in counties that had Superfund
sites in 1990
All Superfund Sites That Have Not Yet Reached
"Construction Completion"
30%
20%
10%
1990
1992
SOURCE: Environmental Protection Agency, Superfund NPL Assessment Program (SNAP) Database.
In 1990, 55 percent of children lived in counties that had Superfund sites. By 2000,
many of those counties no longer had sites on Superfund s National Priorities List
(NPL), because final remediation and cleanup of their sites had been achieved. Fifty
percent of children live in counties that had Superfund sites in 1990 and still have
Superfund sites in 2000.
Many of the sites that were on the NPL in 1990 and remain on the list today have
been substantially remediated and are described as having reached "Construction
Completion." Forty percent of children currently live in counties that had
Superfund sites in 1990 and still have Superfund sites that have not reached
Construction Completion, a reduction from 55 percent in 1990.
Part I: Environmental Contaminants
-------
-------
PART II
Biomonitoring
-------
-------
his section of the report presents measures reflecting levels of contaminants in Pfl l"t I
children.
Data on the levels of pollutants in children's bodies provide direct information about 5J
exposures to environmental contaminants that may harm children. These measurements
most often are taken from blood samples, but also can come from sources such as urine
or hair. The disadvantage of these measurements is that it is difficult to determine the
source of the exposures. For example, lead may occur in children's blood when they
inhale airborne lead, eat contaminated food, or when they play in contaminated soil or
dust and then put their hands in their mouths.
Also, it is invasive to obtain samples and can be expensive to obtain enough samples to
estimate the distribution of contaminants in children for the nation or for groups that
may have higher exposures such as the poor.
The measures in this report for biomonitoring present data on concentrations of lead in
blood. Blood lead is an important measure because it is directly related to neurological
and developmental effects in children, and national data are available for a number of
years. Many other pollutants for which biomonitoring data are not currently available
on a national level are important to children's health. However, the federal government
currently is collecting and analyzing biomonitoring data for a number of other compounds
important to children, including pesticides, heavy metals such as mercury and cadmium,
and compounds that indicate exposure to environmental tobacco smoke. This work will
be incorporated into future editions of this report.
Part II: Biomonitoring
-------
Concentrations of Lead in Blood
Lead is a major environmental health hazard for young children. Research shows that
blood lead levels of 10 micrograms per deciliter of blood (ug/dL) in young children can
result in lowered intelligence, reading and learning disabilities, impaired hearing,
reduced attention span, hyperactivity, and antisocial behavior.37 However, there cur-
rently is no demonstrated safe concentration of lead in blood, and adverse health effects
can occur at lower concentrations.
Lead in the Blood
of Young Children
Today, high blood lead levels are due mostly to deteriorated lead paint in older homes
and contaminated dust and soil.37 Soil that is contaminated with lead is an important
source of lead exposure because children play outside and very small children frequently
put their hands in their mouths. Research shows that pulverized leaded paint and past
emissions of lead in gasoline that subsequently were deposited in the soil contribute to
lead-contaminated soil and house dust.38
Children also may be exposed to lead through drinking water contaminated by pipes
and fixtures containing lead. In the past, ambient concentrations of lead from leaded
gasoline were a major contributor to childhood blood lead levels.
Healthy People 2010: Objective 8-11 of the Healthy People 2010 initiative aims to totally
eliminate elevated blood levels in children. See Appendix C for more
information.
America's Children and the Environment: A First View of Available Measures
-------
Concentrations of Lead in Blood
Average concentrations of lead in blood for children 5 and
under
All | Family Incomes Above
Poverty Level
Family Incomes Below
Poverty Level
1976-1980
1988-1991
1992-1994
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health and
Nutrition Examination Survey.
Average blood lead levels in children 5 years old and under dropped from 16.5
micrograms per deciliter (ug/dL) between 1976 and 1980 to 3.6 ug/dL between
1992 and 1994, a decline of 78 percent.
The decline in average blood lead levels is due largely to the phasing out of lead in
gasoline between 1973 and 1995.12 Some decline also was due to legislation
banning lead from paint and plumbing supplies.
In 1976-1980 the average child, regardless of family income, had an elevated blood
lead level (i.e. concentrations greater than 10 ug/dL). However, children living in
families with incomes below the poverty line had higher average blood lead
concentrations than those living in families with incomes at or above the poverty
line. This disparity continued through the 1990s.
Although the concentration of lead in blood is an important indicator for risk, it
reflects only current exposures. Lead also accumulates in bone. Recent research suggests
that concentrations of lead in bone may be more related to adverse health outcomes in
children than concentrations in blood are.39 This suggests that concentrations in bone
may better reflect the net burden of exposure. However, methods for measuring lead in
bone are more time-consuming and expensive than those for measuring lead in blood.
Concentrations of lead in air remain greater than the National Ambient Air Quality
Standards in some areas in the United States. The main sources of ambient
concentrations of lead are metals processors such as smelters and battery manufacturers.
Part II: Biomonitoring
-------
Concentrations of Lead in Blood
BlOOd L0ad by Many children still have elevated blood lead levels (levels above 10 ug/dL). Race and
RaCG and InCOiriG poverty affect the likelihood that a child has an elevated blood lead level. Blood lead
levels are highest for younger children, because their exposure per pound of body
weight is greater due to their smaller body weight.
The youngest age group for which data are available, ages 1-5, are presented here.
Measures of blood lead by race and income can help identify the groups that are at
greatest risk.
America's Children and the Environment: A First View of Available Measures
-------
Concentrations of Lead in Blood
Measure B2
Percentage of children ages 1-5 with concentrations of lead in
blood greater than 10 micrograms per deciliter, 1992-1994
,
18%
16%
14%
12%
10%
8%
6%
4%
2%
0%
All
Black non-Hispanic
Hispanic
White non-Hispanic
At or Above Poverty Level
Below Poverty Level
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health and
Nutrition Examination Survey.
In 1992-1994, approximately 1.5 million children (2.3 percent) 17 and younger
had elevated blood lead levels (concentrations greater than 10 ug/dL). Four percent
of children between the ages of 1 and 5 (890,000) had elevated blood lead levels.
Children who lived in families with incomes below the poverty line had a greater
risk of elevated blood lead levels than those who lived in families with incomes at or
above the poverty line.
For all income levels, non-Hispanic Black children had a greater risk of elevated
blood lead levels than white children. However, the disparity is greater for Black
children who live in families with incomes below the poverty line.
Approximately 73,000 children had blood lead levels greater than 20 ug/dL
between 1992 and 1994. This is twice the level considered to be elevated.
Currently, there is no demonstrated safe concentration of lead in blood. Recent
research on a national sample of children measured effects down to the lowest
detectable concentrations of lead in blood, and the results suggest that health effects
can occur at blood lead levels as low as 2.5 ug/dL.40 Approximately 11 million
children between the ages of 1 and 5, about 54 percent of that age group, had blood
lead levels of 2.5 ug/dL or greater between 1992 and 1994.
Part II: Biomonitoring
-------
-------
PART
Childhood
Diseases
-------
-------
his section of the report presents measures of adverse health effects in children Pfl l"t
that may be influenced by exposures to environmental contaminants.
There are many important diseases that affect children, some in which environmental
contaminants are known to play a role and others for which the role is unclear. This DlSG3SGS
report focuses on important childhood diseases for which we have nationally representa-
tive and readily available data, and for which some evidence exists to indicate or suggest
that the disease is partially influenced by environmental contaminants. The diseases
selected for this report are asthma, chronic bronchitis, and childhood cancer. The
Interagency Task Force on Environmental Health Risks and Safety to Children, organ-
ized by EPA and the Department of Health and Human Services, has identified asthma
and childhood cancer as priorities.
Additional diseases that may be partially influenced by environmental contaminants
include other respiratory diseases, waterborne diseases, methemoglobinemia, birth
defects, developmental defects, and learning disorders. Diseases that may result from
childhood exposures to environmental contaminants, but that do not manifest them-
selves until adulthood, are not addressed in this report.
Part III: Childhood Diseases
-------
Respiratory Diseases
OutCOHlGS Asthma is the most common chronic disease among children and is a costly disease in
in ChildrGn: both human and monetary terms.41 Children with asthma may need to limit daily activi-
ASthma and ^es to contr°l or prevent asthma attacks and often require long-term use of medications.
Chronic Bronchitis Extreme exacerbation of asthma can lead to emergency room visits, hospitalizations,
and sometimes death. The tendency to develop asthma can be inherited, but not all
children with asthma have a family history of the disease. Exposures to indoor and out-
door sources of biological and chemical environmental contaminants have been shown
to cause asthma or exacerbate existing asthma. Exposures to outdoor air pollutants,
such as particulate matter, have been shown to exacerbate asthma. Chronic bronchitis
also is a condition in children that has been associated with exposure to air pollutants,
including particulate matter and ozone. ^
America's Children and the Environment: A First View of Available Measures
-------
Respiratory Diseases
Measure Dl
Percentage of children under 18 with asthma and chronic
bronchitis
3%
2%
1%
0%
1990
1991
1992
1993
1994
1995
1996
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health Interview
Survey.
Between 1990 and 1995, the number of children with asthma increased by about
30 percent, from 5.8 percent in 1990 to 7.5 percent in 1995. The number of
children with asthma in the United States increased by 75 percent from 1980 to
1994. A slight decrease in asthma rates occurred between 1995 and 1996.
The number of children with chronic bronchitis increased slightly from 5.4 percent
in 1990 to 5.7 percent in 1996.
Some environmental factors may cause children to develop asthma, but the causes
of asthma are not completely understood. In a recent report, the Institute of
Medicine identified house dust mites as an agent known to cause asthma, and
cockroaches and tobacco smoke as other indoor sources suspected to cause
asthma.
Other environmental factors may increase the severity or frequency of asthma in
children who have the disease. Children with asthma are particularly sensitive to
outdoor air pollution such as ozone, particulate matter, and sulfur dioxide. These
pollutants can exacerbate asthma, possibly leading to an increased use of
medication, visits to doctors' offices, and trips to emergency rooms. In severe cases
asthma can lead to hospital admissions and even death.
Part III: Childhood Diseases
-------
Respiratory Diseases
Prevalence Of ASthma Children of lower-income families and children of color are more likely to have asthma.
by Race and InCOme These children often have less access to medical care, which can increase the severity
and impact of their illness. Data for 1997-1998 show that the percentage of children
with asthma differs by racial and ethnic groups, and by poverty level.
In 1997, the method for measuring asthma among children was changed. Estimates for
the percentage of children with asthma are lower in 1997-1998 than in 1996, but it is
not clear whether this is due to an actual decrease in the percentage of children with
asthma or the change in how asthma is measured.
America's Children and the Environment: A First View of Available Measures
-------
Respiratory Diseases
Measure D2
9%
8%
7%
6%
5%
4%
3%
2%
1%
0%
Percentage of children under 18 with asthma, 1997-98
All
At or Above Poverty Level
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health Interview
Survey.
In 1997-98, 5.4 percent of all children had asthma.
Non-Hispanic Black children living in families with incomes below the poverty
level have the highest rates of asthma of any group: 8.3 percent of children.
Approximately 5 percent of both White non-Hispanic children and Hispanic
children have asthma.
Children living in families with incomes below the poverty level had higher rates of
asthma, 6.2 percent, than those children living in families at or above the poverty
level, 5.3 percent.
Part III: Childhood Diseases
-------
Respiratory Diseases
Asthma The rate of children hospitalized for asthma is another important measure because it
represents the most severe cases—those in which asthma could not be controlled on an
outpatient or emergency department basis.
Only a fraction of children with asthma are admitted to the hospital. Hospitalization for
asthma can be related to a number of factors, including air pollution and lack of access
to primary health care. Studies conducted in the northeastern United States indicate
that air pollution during the summer was associated with approximately 6-24 percent
of all hospital admissions for asthma.
Healthy People 2010: Objective 24-02a of the Healthy People 2010 initiative seeks to reduce
asthma-related hospitalizations of children under 5. See Appendix C for
more information.
America's Children and the Environment: A First View of Available Measures
-------
Respiratory Diseases
Measure D3
Asthma hospitalization rate for children 0-14
fe 200
1987 1988 1989
1990
1991 1992 1993
1994 1995 1996 1997 1998
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health Interview
Survey.
The asthma hospitalization rate for children aged 0-14 increased from 284 per
100,000 in 1987 to 369 per 100,000 in 1995, and then dropped to 277 per
100,000 in 1998.
Children aged 0-14 represent 38 percent of asthma hospitalizations for all ages
(children and adults) during 1998.45
Asthma hospitalizations accounted for 7 percent of all hospitalizations for children
aged 0-14 in 1998, and asthma was the fourth leading cause of non-injury-related
hospital admissions.
Outdoor air pollutants such as particulate matter and ozone are associated with
increased emergency room visits and hospital admissions. ^
Exposure to two other important air pollutants, nitrogen dioxide and sulfur
dioxide, has been shown to decrease lung function in asthmatics.46
Part III: Childhood Diseases
-------
Childhood Cancer
Cancer in childhood is quite rare compared with cancer in adults, but it still causes the
most deaths, other than injuries and accidents, among children 0-19 years of age.47
Childhood cancer is not a single disease, as it includes a variety of malignancies. The
forms of childhood cancer that are most common vary at different ages.
InCidGHCG The incidence of childhood cancer increased from 1975 until about 1990. The frequency
MortSlitV of the disease appears to have become fairly stable overall since 1990. Mortality has
declined substantially during the last 25 years, due largely to improvements in treatment.
The causes of cancer in children are poorly understood, though in general it is thought
that different forms of cancer have different causes. Established risk factors for the
development of childhood cancer include family history, genetic defects, radiation, and
certain pharmaceutical agents used in chemotherapy.47 Evidence from epidemiological
studies suggests that environmental contaminants such as pesticides and certain chemi-
cals, in addition to radiation, may contribute to an increased frequency of some child-
hood cancers.32 Some studies have found that children born to parents who work with
or use such chemicals are more likely to have cancer in childhood.48 It may be that the
chemicals cause mutations in parents' germ cells that may increase the risk of their chil-
dren developing certain cancers, or perhaps the parental exposure is passed on to the
child while in utero, affecting the child directly. Children's direct exposures to such
chemicals also may contribute to cancer.
America's Children and the Environment: A First View of Available Measures
-------
Childhood Cancer
Measure D4
Cancer incidence and mortality for children under 20
1995
SOURCE: Incidence data are from the National Cancer Institute, Surveillance, Epidemiology and End Results Program.
Mortality data are from Centers for Disease Control and Prevention, National Center for Health Statistics.
Age-adjusted annual incidence of cancer in children increased from 130 to 150 cases
per million children between 1975 and 1995. The incidence appears to have leveled
off after 1990. Mortality decreased from 50 to 30 deaths per million children during
the same period.
Rates of cancer incidence vary by age. Rates are highest among infants, decline until
age 9, and then rise again with increasing age. Between 1986 and 1995, children
under 5 and those aged 15-19 experienced the highest incidence rates of cancer at
approximately 200 cases per million. Children aged 5-9 and 10-14 had lower
incidence rates at approximately 110 and 120 cases per million respectively.
Between 1992 and 1996, incidence rates of cancer were highest among whites at
160 per million. Hispanics were next highest at 150 per million. Asians and Pacific
Islanders had an incidence rate of 140 per million, Black children had a rate of
120 per million, and Native Americans and Alaska Natives had the lowest at 80 per
million. Data on the incidence of childhood cancer by race and ethnicity are shown in
the data tables in Appendix A.
Part III: Childhood Diseases
-------
Childhood Cancer
Childhood Cancer
by Type
Trends in the total incidence of childhood cancer are useful indicators for assessing the
overall burden of cancer among children. However, broad trends mask changes in fre-
quency of individual cancers. Individual cancers often have patterns that diverge from
the overall trend. Moreover, environmental factors may be more likely to contribute to
some childhood cancers than to others.
Ionizing radiation, such as from x-rays, is a known cause of leukemia and brain
tumors. There is suggestive—but not conclusive—evidence that parental exposures to
certain chemicals may be a cause of leukemia, brain cancer, non-Hodgkin's lymphoma,
and Wilms' tumor in children.
A number of studies have evaluated the relationship between pesticide exposure and
certain types of childhood cancer, and while the evidence is suggestive of a link, it is
still not conclusive.47 Most studies of the relationship between pesticide exposure and
leukemia and brain cancer show increased risks for children whose parents used pesti-
cides at home or work, and for children who may be exposed to pesticides in the
home.52"53 Evidence is limited but suggestive that non-Hodgkin's lymphoma in children
may be linked to parental pesticide exposure and exposure to pesticides in the home.52
There is some evidence linking pesticide use to Wilms' tumor and Ewing's sarcoma.52
America's Children and the Environment: A First View of Available Measures
-------
Childhood Cancer
Measure D5a
Cancer incidence for children under 20 by type
30
25
c 20
a> 15
a.
o
1 10
I II I
11973-1978
1985-1990
1979-1984
11991-1996
.1
I I
II
I I I I I I
I II II II ll
I
Acute
lymphoblastic
Acute
myeloid
Leukemias
Central
nervous
system tumors
Hodgkin's
Lymphoma
Non-Hodg kin's
Lymphoma
Thyroid
carcinoma
Malignant
melanoma
Lymphomas
Carcinomas and other
epithelial neoplasms
SOURCE: Surveillance, Epidemiology, and End Results Program 1973-1996, Division of Cancer Control and Population
Sciences, National Cancer Institute.
Leukemia was the most common cancer diagnosis for children from 1973-1996,
representing 25 percent of the total cancer cases. Incidence of acute lymphoblastic
leukemia has increased moderately from 23 cases per million between 1973-1978 to
approximately 27 cases per million between 1991-1996. Rates of acute myeloid
leukemia have remained stable.
Central nervous system tumors represented 17 percent of childhood cancers. The
incidence of central nervous system tumors increased from approximately 23 per
million in 1973-1978 to 29 per million in 1991-1996.
Lymphomas, which include Hodgkin's disease and non-Hodgkin's lymphoma,
represent approximately 16 percent of childhood cancers. Hodgkin's disease
declined slightly from roughly 14 per million in 1973-1978 to approximately 13
per million in 1991-1996. Non-Hodgkin's lymphomas increased from 8.9 per
million in 1973-1978 to approximately 11 per million in 1991-1996.
Part III: Childhood Diseases
-------
Childhood Cancer
Measure D5b
Cancer incidence for children under 20 by type
30
25
20
11973-1978
1979-1984
1985-1990
11991-1996
a> 15
ll. lllll.l
0 Germ cell
tumors
Soft
tissue
Osteo- Ewing's Neuro- Wilms'
sarcoma sarcoma blastoma tumor
Retino- Hepato-
blastoma blastoma
sarcomas Malignant Bone Tumors
SOURCE: Surveillance, Epidemiology, and End Results Program 1973-1996, Division of Cancer Control and Population
Sciences, National Cancer Institute.
Different types of cancer affect children at different ages. Neuroblastomas, Wilms'
tumor (tumors of the kidney), and retinoblastoma (tumors in the eye) usually are
found only in very young children. Leukemias and nervous system cancers are most
common through age 14; lymphomas, carcinomas, and germ cell and other gonadal
tumors are more common in those 15-19 years old.47
America's Children and the Environment: A First View of Available Measures
-------
Future Directions
n the process of developing this report, we identified a number of limitations to
the most readily available data and the methods used to collect and present them.
This section discusses recommended improvements to the measures in the report and
improvements to the data sources used to calculate the measures. We also include a
discussion of tracking systems for childhood diseases.
There are many important measures that we would like to include in future reports;
our discussion here is focused on those of greatest importance, which were identified
through discussion with experts in the field.
Ideally, measures would be available to reflect all important factors in each of the three
parts of this report.
For environmental contaminants, ideal measures would reflect concentrations in the
environment of all of the chemical and biological agents that are important for children.
The measures would reflect the potential for children to be exposed to these pollutants.
For concentrations of contaminants measured in children, ideal measures would reflect
concentrations of the key pollutants that tend to accumulate in children and that pose
high risks of health effects.
For childhood diseases, ideal measures would reflect all the important childhood dis-
eases that may be caused by or exacerbated in part by environmental factors.
Ideally, for measures in all three parts of the report, data sources would provide infor-
mation for all of the nation's children. Data also would be available for 10 years or
more to provide information about changes over time. Information would be available
on differences among geographic areas, differences among racial-ethnic groups, and dif-
ferences by various social and economic status factors.
Characteristics of
Ideal Measures
In the sections below, we outline potential improvements to the existing measures and
describe other data that we would like to include in future reports. As future editions of
this report are developed, we will continue to review and assess data sources that are
available. This review and assessment will be an ongoing process as new sources of data
are identified and, we hope, existing sources of data are improved.
Data for Existing and
New Measures
Our goal is to have nationally representative measurements of concentrations of environ- Environmental
mental contaminants that could affect children's health in air, water, food, and soil. Contaminants
Common Air Pollutants
The measures used for criteria air pollutants are based on two kinds of data: exceedances
of national standards and the reports of daily air quality generated through the Air
Quality Index.
To further develop measures in this area, the first priority is to obtain data on measured
concentrations of air pollutants in all counties. These data would allow for a more
detailed assessment of the severity of pollution, both in terms of the numbers of days in
Future Directions
-------
Future Directions
which standards are exceeded and the actual concentrations of pollutants. The data also
would allow better assessment of the measure's completeness.
As noted in Part I of the report, the information about exceedances of standards shows
only whether air quality, at any point during a year, exceeds a standard. It does not
allow any analysis of how often such exceedances occur. On the other hand, it does
provide disaggregation of the data separately for each pollutant.
Measures based on actual concentrations may better capture the potential health risks to
children. Such measures could portray the combined pollution burden from multiple pol-
lutants on any single day as well as the full duration of concentrations at various levels.
Hazardous Air Pollutants
The measures in this report for hazardous air pollutants (air toxics) are based on data
from the year 1990 only. Work is underway to produce measures that will reflect trends
over time in ambient concentrations of hazardous air pollutants. Estimates of ambient
concentrations in 1996 are expected to be completed within the coming year and will be
incorporated into next year's report. Estimates will be updated every three years thereafter.
Data from air toxics monitoring programs also could be considered for inclusion in future
editions of this report. Currently, national data on air toxics monitoring are limited and
much of the monitoring and data collection are performed at the state level.
The air toxics measures presented in this report do not distinguish between situations
in which many hazardous air pollutants exceed health benchmarks and those in which
only one exceeds the benchmarks. Measures accounting for the number of hazardous
air pollutants exceeding health benchmarks may provide a fuller picture of the potential
risks to children. To develop these measures further, the authors will consider monitor-
ing information and updated modeling data.
The hazardous air pollutants measures in this report are further limited because they
represents only the presence of these pollutants in ambient air. For certain hazardous air
pollutants that are persistent in the environment, greater exposures occur in food.
These pollutants settle out of the air onto land and into bodies of water, and then are
taken up in the food chain. Future work on measures of food contaminants will con-
sider this pathway of exposure (see the section on food contaminants below).
Indoor Air Pollutants
Indoor air contaminants are represented by a surrogate measure reflecting the percent-
age of homes where people smoke. The most important improvement to this measure
would be to add data for other sources of indoor air pollutants, such as consumer prod-
ucts, gas stoves, and furnishings, for both homes and schools. We have not identified
any nationally representative data on air contaminants for homes, schools, and other
indoor environments in which children may spend large amounts of time, but we will
continue to explore possible measures in this area.
America's Children and the Environment: A First View of Available Measures
-------
Future Directions
Drinking Water Contaminants
The measures for contaminants in drinking water reflect violations of national stan-
dards. These measures share the limitations of the criteria air pollutant measures, as
described above, in that they do not distinguish among the impacts of various concen-
trations of contaminants. The data on drinking water contaminants are less complete
than those used for the air measures because less reporting of water contaminants
occurs at the national level. In addition, the drinking water contaminant measures in
this report rely on the Maximum Contaminant Level (MCL) standards, which are
based partly on health considerations but also take into account technical feasibility.
Each MCL also has a corresponding Maximum Contaminant Level Goal (MCLG),
which is based only on health considerations. The MCLG could be considered for
measures in future reports.
Actual measured contaminant concentrations would provide the most relevant meas-
ures of potential risks to children. The most complete data are collected at the state
level; information from the states would need to be compiled nationally to improve the
measures for drinking water. Another problem with the data on drinking water is that
many water systems do not adequately monitor for contaminants, so we have no infor-
mation about potential risks to children in those areas. Future reports will consider data
collected at the state level.
Since 1999, EPA has required water suppliers to send annual reports on drinking water
quality to their customers. These reports contain information on the drinking water
source and the level, or range of levels, of contaminants found in local drinking water.
These data also will be considered along with state data in future reports.
Information on sources of contamination to ground water and surface water sources
that supply water to public water systems is important for identifying the key contribu-
tors to drinking water contamination. EPA now requires states to assess all the ground
water and surface water sources that supply water to public water systems. These assess-
ments will identify the major potential sources of contamination to drinking water sup-
plies, and will help officials determine the water systems' susceptibility to contamina-
tion. Information from state assessments will be considered for future reports.
Surface Water Contaminants
In future reports we hope to characterize the risks to children posed by the consump-
tion of fish contaminated with mercury, PCBs, and other toxicants that affect neuro-
logical development. Many states target their warnings on the consumption of fish
from contaminated water to pregnant women and children. We also would like to char-
acterize the risks posed to children by swimming in waters with bacterial contamina-
tion. Children are at greater risk of illness while swimming than adults are because of
their longer exposure times and more frequent accidental ingestion of water.
On October 10, 2000 the Beaches Environmental Assessment and Coastal Health Act
was signed into law. This new amendment to the Clean Water Act requires nationally
consistent bacterial standards for recreational waters in all coastal and Great Lakes
beaches, and provides grants for states and tribes to conduct beach monitoring and
notification programs. Data generated under this provision, when available, may be
useful for constructing measures for future reports.
Future Directions
-------
Future Directions
Pesticide Residues and Other Food Contaminants
Contaminants in food are represented in this report by a measure of the frequency with
which pesticides are detected in tested samples of produce. This measure does not dis-
tinguish among differing levels of contamination. Furthermore, the detection limits do
not provide a health-based point of comparison, as they are not equivalent to levels of
concern for children's health.
For future reports we will consider improved measures for pesticides that incorporate
the actual measured levels of pesticide residues, along with children's food consumption
rates that are available from surveys conducted by the U.S. Department of Agriculture.
The Food Quality Protection Act (FQPA) of 1996 established a single, health-based
safety standard for new and existing pesticides and their residues in raw and processed
food. EPA now routinely considers the combined effects of pesticide exposure from
food, drinking water, and other non-work related uses, as well as the effects of pesti-
cides that act in the same way in the body. We will consider new data, standards and
analytical techniques developed in the implementation of FQPA in developing meas-
ures for future versions of this report.
We also will examine the available data on the presence of other types of contaminants
in foods. As noted above, some hazardous air pollutants find their way into the food
chain after being deposited from the atmosphere, and their presence in food can pose
more of a risk to children than their presence in the air. In addition, children are
exposed in utero and nursing infants may be exposed to persistent contaminants in
breast milk. We will explore the feasibility of preparing measures of these other food
contaminants for future reports.
Finally, some children may be exposed to particularly elevated levels of contaminants in
food, including children in homes where much of the diet comes from subsistence fish-
ing or subsistence farming. We will explore the availability of suitable data regarding
such differential exposures for future reports.
Land Contaminants
For contaminants in soil, this report includes a measure of the percentage of children
living in counties that have a Superfund site. This measure will be refined for future
reports by considering whether children live in close proximity to one of these sites
(e.g., within one mile), rather than whether they live anywhere in the same county. A
measure of children living in proximity to brownfield sites also will be considered for
future reports. We are not aware of nationally representative databases of contaminants
in soil. Measures for soil contaminants will focus on proximity to sites found to have
high levels of contamination or other surrogates.
Other Contaminated Media
Key additional data needs focus on exposure pathways and environments that are par-
ticularly important for children. A number of contaminants may gather on household
surfaces, including those found in indoor air, contaminants in soil that are tracked into
the home, and those from the workplace that inadvertently are brought into the home
on the parents' clothes or body. Young children may be frequently exposed to environ-
mental contaminants that gather on floors and other surfaces in the home through
hand-to-mouth and object-to-mouth contact. Data available for these exposure scenar-
ios are limited.
America's Children and the Environment: A First View of Available Measures
-------
Future Directions
Currently, nationally representative biomonitoring data are available for concentrations of
lead in blood. Data are needed on concentrations of other contaminants in children's bodies.
The Centers for Disease Control and Prevention (CDC) currently are collecting addi-
tional biomonitoring data for an annual National Exposure Report Card. The report
card is intended to provide concentrations of toxic substances present in the U.S. popu-
lation, from measurements in samples of blood and urine. CDC's sampling process will
provide some measurements for children. The 25 substances to be included in the first
report card will include heavy metals, cotinine, nonpersistent pesticides, and phthalates.
We will develop new biomonitoring measures for future versions of this report as the
CDC data become available.
The childhood diseases in this report were selected using several criteria: The data had
to be nationally representative and readily available; some proportion of the observed
effects should be caused, or suspected to be caused, by environmental contaminants;
and the diseases must be important to children. The current report includes measures
for respiratory related diseases, with an emphasis on asthma, and measures for child-
hood cancer. Other measures of severity for respiratory effects will be considered for
future reports, including emergency room visits and deaths. Several additional respira-
tory conditions, such as lung function, are influenced by environmental factors but are
not included in this report. Future work will focus on identifying appropriate data
sources for these measures.
A number of additional types of childhood diseases, such as birth defects and water-
borne diseases, may be environmentally mediated, but we do not have consistent
nationally representative data for them. For other important effects, such as learning
and neurological disorders, identifying appropriate data sources may be difficult. Future
work will focus on identifying important childhood diseases for which existing data
sources may be used for tracking.
Tracking systems are important for following trends in diseases that may be important in
children. These systems can help researchers and health officials identify progress toward
reducing diseases and areas that require research and interventions. Some childhood dis-
eases are tracked at the state level. Examples of tracking systems include cancer registries
in some states, which collect data on all the reported cancers in those states. Measures of
the extent to which we track these important diseases could be added to future editions
of this report. For example, the percentage of states that have tracking systems for cer-
tain types of important childhood diseases could be included as a measure in next year's
report. Suggested topics include birth defects, asthma, and learning disorders.
Childhood Diseases
and Tracking
Future Directions
-------
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America's Children and the Environment: A First View of Available Measures
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Glossary of Terms
Air Toxics:
Synonym for "hazardous air pollutants." (See below).
Ambient Air:
Any unconfmed portion of the atmosphere: open
air, surrounding air.
Benzene:
A colorless, volatile, flammable, toxic liquid aromatic
hydrocarbon (CgHg) used in organic synthesis, as a
solvent, and as a component of motor fuel.
Biomonitoring:
Analysis of blood, urine, tissues, etc., to measure chemical
exposure in humans.
Carcinoma:
Cancer that begins in the tissues lining or covering
an organ.
Carbon Monoxide (CO):
A colorless, odorless, poisonous gas produced by
incomplete fossil fuel combustion.
Chromium:
A heavy metal that is an important hazardous air pollutant.
(See "heavy metals.")
Contaminant:
Any physical, chemical, biological, or radiological substance
or matter in air, water, or soil that can have adverse health
effects.
Criteria Pollutants:
The 1970 amendments to the Clean Air Act required EPA
to set National Ambient Air Quality Standards for certain
pollutants known to be hazardous to human health. EPA
has set standards to protect human health and welfare for
six pollutants: ozone, carbon monoxide, total suspended
particulates, sulfur dioxide, lead, and nitrogen oxides. The
term "criteria pollutants" derives from the requirement that
EPA must describe the criteria—characteristics and poten-
tial health and welfare effects of these pollutants—for set-
ting or revising standards.
Deciliter:
One-tenth of a liter (0.1 liter).
Exposure:
Human contact with environmental contaminants or con-
centrations of contaminants in media.
Media:
Specific environments—air, water, soil—that are the subject of
regulatory concern and activities because of potential for
human exposure.
Environmental Tobacco Smoke:
Mixture of smoke exhaled by a smoker and the smoke from
the burning end of the smoker's cigarette, pipe, or cigar.
Germ Cell Tumor:
A type of tumor found in the ovaries or testicles.
Gonadal Tumor:
Tumor specific to the gonads.
Hazardous Air Pollutants:
Air pollutants that are not covered by ambient air quality
standards but which, as defined in the Clean Air Act, may
reasonably be expected to cause or contribute to irreversible
illness or death. Such pollutants include asbestos, berylli-
um, mercury, benzene, coke oven emissions, radionuclides,
and vinyl chloride. A total of 188 hazardous air pollutants
are listed in section 112(b) of the Clean Air Act, as amend-
ed in 1990.
Heavy Metals:
Metallic elements with high atomic weights, e.g., mercury,
chromium, cadmium, arsenic, and lead; can damage living
things at low concentrations.
Immunodeficiency:
Inability to produce a normal complement of antibodies
or immunologically sensitized T cells, especially in response
to specific antigens.
Ionizing Radiation:
Pvadiation that can strip electrons from atoms, i.e., alpha,
beta, and gamma radiation.
Lymphoma:
Lymphomas are tumors in the lymph system, which is
responsible for fighting diseases in the body and is part
of the immune system. Lymphomas are the third most
common form of cancer in children.
Glossary of Terms
-------
Glossary of Terms
Mercury:
A heavy metal that can bioaccumulate in the environment
and is highly toxic if breathed or swallowed.
Methemoglobinemia:
The presence of excess methemoglobin in the blood, which
replaces hemoglobin and results in loss of the ability to
transport oxygen in the blood. A small amount of methe-
moglobin is present in the blood normally, but injury or
toxic agents, such as nitrites, convert a larger proportion of
hemoglobin into methemoglobin.
Microgram (JJQ):
One-millionth of a gram.
Microorganisms:
Tiny living organisms that can be seen only with the aid
of a microscope. Some microorganisms can cause acute
health problems when consumed in drinking water.
Also known as microbes.
Mortality:
Death rate.
National Ambient Air Quality Standards
(NAAQS):
Standards established by EPA to protect human health and
the environment from criteria pollutants, which apply for
outside air throughout the nation.
Nitrogen Dioxide (NO2):
A chemical that results from nitric oxide combining
with oxygen in the atmosphere; a major component
of photochemical smog.
Ozone:
A gas that results from complex chemical reactions between
nitrogen dioxide and volatile organic compounds; the
major component of smog.
Particulate Matter:
Particles in the air, such as dust, dirt, soot, smoke, and liq-
uid droplets; may have significant effects on human health.
Polychlorinated Biphenyls (PCBs):
A group of toxic, persistent chemicals used in electrical
transformers and capacitors for insulating purposes, and
in gas pipeline systems as a lubricant. The sale and new use
of PCBs were banned by law in 1979.
Prenatal:
Occurring, existing, or performed before birth.
Radionuclides:
Radioactive isotopes or unstable forms of elements.
Retinoblastomas:
Tumors of the eye.
Sulfur Dioxide (SO2):
A pungent, colorless, gaseous pollutant formed primarily by
the combustion of fossil fuels.
Superfund:
The program operated under the legislative authority
of the Comprehensive Environmental Response,
Compensation and Liability Act of 1980 (CERCLA)
that funds and carries out EPA solid waste emergency
and long-term removal and remedial activities. These activi-
ties include establishing the National Priorities List, investi-
gating sites for inclusion on the list, determining their pri-
ority, and conducting and/or supervising cleanup and other
remedial actions.
Trichloroethylene (TCE):
A stable, low boiling-point colorless liquid, toxic
if inhaled. Used as a solvent or metal decreasing agent,
and in other industrial applications.
America's Children and the Environment: A First View of Available Measures
-------
APPENDIX A
Data Tables
-------
Data Tables
Table El
Percentage of children living in counties in which air quality
standards were exceeded
1990-1995
^^M
Ozone
Particulate matter
Carbon monoxide
Lead
Sulfur dioxide
Nitrogen dioxide
Any Standard
1990
22,6%
8,0%
9,5%
2,2%
0,5%
3,7%
28,0%
1991
25,1%
6,3%
8,5%
6,0%
2,1%
3,7%
31,9%
16,9%
9,6%
6,2%
1,8%
0,1%
0,0%
20,9%
1993
21,0%
2,7%
5,1%
2,1%
0,5%
0,0%
24,3%
19,0%
2,3%
6,6%
1,7%
0,1%
0,0%
23,6%
1995
27,7%
10,0%
5,0%
1,8%
0,1%
0,0%
30,9%
1996-1998
^m
Ozone
Particulate matter
Carbon monoxide
Lead
Sulfur dioxide
Nitrogen dioxide
Any Standard
1996
16,4%
1,5%
5,7%
1,6%
0,1%
0,0%
19,9%
1997
18,5%
2,4%
3,8%
1,4%
0,1%
0,0%
21,9%
1998
20,7%
2,0%
4,3%
1,6%
0,1%
0,0%
23,2%
SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Aerometric Information Retrieval System.
Table E2
Percentage of children's days with good, moderate, or
unhealthy air quality
1990-1994
Pollution Level 1990 1991 1992 1993 1994
Good 58,8% 58,9% 62,6% 61,9% 60,1%
Moderate 27,7% 27,7% 24,1% 25,3% 26,9%
Unhealthy 4,0% 3,9% 3,5% 3,0% 3,0%
No Monitoring Data 9,5% 9,4% 9,8% 9,8% 10,0%
1995-1998
Pollution Level
Good
Moderate
Unhealthy
No Monitoring Data
SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Aerometric Information Retrieval System.
1990
58,8%
27,7%
4,0%
9,5%
1995
61,3%
25,5%
2,8%
10,3%
1991
58,9%
27,7%
3,9%
9,4%
1996
63,3%
24,6%
2,2%
10,0%
1992
62,6%
24, 1 %
3,5%
9,8%
1997
63,3%
24,5%
1,6%
10,6%
1993
61,9%
25,3%
3,0%
9,8%
1998
61,9%
27,1%
1,6%
9,4%
America's Children and the Environment: A First View of Available Measures
-------
Data Tables
Table E3
Percentage of children living in counties where at least one
hazardous air pollutant concentration was greater than a health
benchmark in 1990
Benchmark
Percentage of Children
Cancer,
one-in-a-Million
Cancer,
1-in-l 00,000
100,0%
100,0%
SOURCE: U.S. Environmental Protection Agency, Cumulative Exposure Project.
Cancer,
1-in-l 0,000
6,0%
Other
Health Effects
95,0%
Table E4
Percentage of homes with children under 7 where someone
smokes regularly
Percentage of Homes
94
28,7%
1996
27,6%
19,0%
SOURCE: U.S. Environmental Protection Agency, Office of Air and Radiation, Indoor Environments Division, Survey on Radon Awareness and
Environmental Tobacco Issues.
Table E5
Percentage of children living in areas served by public water
systems that exceeded a drinking water standard or violated
treatment requirements
Type of standard violated
Lead and copper
Microbial contaminants
All other contaminants
Treatment and filtration
All health-based violations
SOURCE: U.S. Environmental Protection Agency, Office of Water, Safe Drinking Water Information System..
1993
9,6%
8,2%
2,3%
2,1%
18,6%
1994
7,0%
7,6%
2,2%
1,1%
13,8%
1995
5,9%
4,4%
2,2%
1 ,2%
12,9%
1996
5,2%
4,2%
2,0%
1 ,3%
1 1 ,6%
1997
5,0%
3,6%
1 ,5%
0,4%
10,2%
1998
4,8%
2,7%
0,9%
0,2%
8,3%
Table E6
Percentage of children living in areas served by public water
systems in which the nitrate/nitrite standard was exceeded
1993
0,2%
1994
0,1%
1995
0,3%
Percentage of children 0,2% 0,1% 0,3% 0,2%
SOURCE: U.S. Environmental Protection Agency, Office of Water, Safe Drinking Water Information System.
1997
0,4%
1998
0,2%
Appendix A: Data Tables
-------
Data Tables
Table E7
Percentage of children living in areas with major violations of
drinking water monitoring and reporting requirements
Lead and copper
Microbial contaminants
Chemical and radiation
Treatment and filtration
Any major violation
1993
10,8%
2,9%
9,4%
1,2%
21,4%
1994
6,6%
2,5%
6,4%
0,4%
14,5%
1995
5,5%
2,0%
4,8%
0,3%
11,6%
1996
5,3%
1,6%
4,4%
0,4%
10,7%
5,8%
2,0%
2,3%
0,2%
10,0%
1998
5,2%
1,7%
2,5%
0,3%
9,6%
SOURCE: U.S. Environmental Protection Agency, Office of Water, Safe Drinking Water Information System.
Table E8
Percentage of fruits, vegetables, grains, dairy, and processed
foods with detectable pesticide residues
Food samples with a single pesticide detected 25,2% 24,7% 23,0%
Food samples with multiple pesticides detected 36,3% 40,3% 44,6%
All food samples with pesticide residues detected 61,5% 65,0% 67,6%
1997
26,9%
28,6%
55,5%
1998
26,3%
28,8%
55,1%
SOURCE: U.S. Department of Agriculture, Agricultural Marketing Service. Pesticide Data Program: Annual Summary (Calendar Years 1993-1998).
Table E9
Percentage of children living in counties with Superfund sites
All Superfund sites
All Superfund sites that have not
reached Construction Completion
55%
1992
56%
1994
58%
199«
57%
55% 54% 53% 53%
SOURCE: U.S. Environmental Protection Agency, Superfund NPL Assessment Program (SNAP) Database.
57%
51%
2000
58%
50%
Table El0
Percentage of children living in counties that had
Superfund sites in 1990
All Superfund sites
All Superfund sites that have not
reached Construction Completion
1990
55%
1992
55%
1994
55%
1996
52%
55% 53% 49% 46%
SOURCE: U.S. Environmental Protection Agency, Superfund NPL Assessment Program (SNAP) Database.
51%
42%
2000
50%
40%
America's Children and the Environment: A First View of Available Measures
-------
Data Tables
Table Bl
Average concentration of lead in blood for children 5 and under
Above poverty level
Below poverty level
Blood lead levels in micrograms per deciliter
1976-1980 1988-1991 1992-1994
16,5 4,7 3,6
15,5 4,0 2,9
20,2 6,3 5,0
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health and Nutrition Examination Survey.
Table B2
Percentage of children ages 1-5 with concentrations of lead in
blood greater than 10 micrograms per deciliter, 1992-1994
All
Above poverty level
Below poverty level
Black Non-Hispanic Hispanic White Non-Hispanic
4,4% 11,2% 5,2% 2,3%
2,1% 5,6% 4,7% 1,1%
8,9% 16,2% 4,7% 6,4%
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health and Nutrition Examination Survey.
Table Dl
Percentage of children under 18 with asthma and chronic
bronchitis
Percentage of children
with asthma
Percentage of children
with chronic bronchitis
1990
5,8%
1991
6,2%
1992
6,3%
7,2%
1994
6,9%
5,3% 5,3% 5,4% 5,9% 5,5%
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health Interview Survey.
1995
7,5%
5,4%
1996
6,2%
5,7%
Appendix A: Data Tables
-------
Data Tables
Addendum to Dl
Estimated average percentage of children under 18 with asthma
during the previous 12 months, by selected years
Characteristic
Race/Ethnicity
White, non-Hispanic
Black, non-Hispanic
Hispanic
Age (years)
0-4
5-10
11-17
Overall prevalence
NOTE: There are insufficient samples for each year by demographic group to include annual prevalence by age and race and ethnicity. We have provided
prevalence estimates by two-year groupings for each of the age, race, and ethnicity categories covered in the National Health Interview Survey.
SOURCE: National Health Interview Survey, 1980-1986, presented in Morbidity and Mortality Weekly Report, Oct. 13, 2000. 49(40): 908-911.
1980-81
3,6%
4,2%
NA
2,9%
4,9%
3,2%
3.7%
1985-86
5,1%
6,0%
3,2%
3,2%
5,5%
5,8%
4.9%
1990-91
6,0%
7,3%
5,1%
4,3%
6,3%
7,1%
6.0%
1995-1996
6,5%
8,2%
7,6%
5,0%
7,4%
7,7%
6.9%
Table D2
Percentage of children under 18 with asthma, 1997-98
All
Above poverty level
Below poverty level
Black Non-Hispanic
5,4% 6,8%
5,3% 6,5%
6,2% 8,3%
Hispanic White Non-Hispanic
4,9% 5,2%
4,7% 5,2%
5,2% 5,3%
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Health Interview Survey.
Table D3
Asthma hospitalization rate for children 0-14 (rate per 100,000)
1987-1994
Asthma hospital izations
per 100,000
1995-1998
Asthma hospital izations
per 100,000
1988
284
369
310
1989 1990
312 308
1991
339
1992 1993
344 280
1996
338
1997
358
1998
277
SOURCE: Centers for Disease Control and Prevention, National Center for Health Statistics, National Hospital Discharge Survey.
1994
295
America's Children and the Environment: A First View of Available Measures
-------
Data Tables
Table D4
Age-adjusted cancer incidence and mortality rates for children
under 20 (rate per million)
1975-1980
Incidence
Mortality
1981-1985
Incidence
Mortality
1986-1990
Incidence
Mortality
1975
128
51
1981
138
44
1986
157
38
1976
141
51
144
45
1987
152
36
1977
141
50
19S
144
43
1988
150
35
144
45
154
39
1989
1979
145
46
1985
157
38
1980
142
46
165
35
154
34
1991-1995
Incidence
Mortality
1991
162
34
1992
160
33
1993
160
33
156
32
1995
154
30
SOURCE: Incidence data from National Cancer Institute, Surveillance, Epidemiology and End Results Program. Mortality data from Centers for Disease
Control and Prevention, National Center for Health Statistics, National Vital Statistics System.
Table D5
Cancer incidence for children under 20 by type (rate per million)
Acute lymphoblastic leukemia
Acute myeloid leukemia
Hodgkin's disease
Non-Hodgkin's lymphoma
CMS tumors
Neuroblastoma
Retinoblastoma
Wilms' tumor
Hepatoblastoma
Osteosarcoma
Ewing's sarcoma
Soft tissue sarcomas
Germ cell tumors
Thyroid carcinoma
Malignant melanoma
1991-96
26,8
5,4
12,8
10,7
29
7,9
3
6,2
1,2
4,9
3,1
11
12,4
5,2
5,2
SOURCE: Surveillance, Epidemiology, and End Results Program 1973-1996. Division of Cancer Control and Population Sciences, National Cancer Institute.
Appendix A: Data Tables
-------
Data Tables
Addendum to D5
Cancer incidence for children under 20 by race/ethnicity and
gender, 1992-1996 (rate per million)
Male
163,0
170,0
129,0
80,0
150,0
155,0
Female
148,0
152,0
122,0
70,0
137,0
136,0
All Races
White
Black
American Indian/Alaska Native
Asian/Pacific Islander
Hispanic
SOURCE: SEER Stat Software, Surveillance, Epidemiology, and End Results Program 1973-1996. Division of Cancer Control Population Sciences,
National Cancer Institute. American Cancer Society, Surveillance Research.
Addendum to D5
Childhood cancer incidence by age, 1991-1995 (rate per million)
Lymphocytic leukemia
Acute non-lymphocytic leukemia
Hodgkin's disease
Non-Hodgkin's lymphoma
Central nervous system
Neuroblastoma
Retinoblastoma
Wilms' tumor
Hepatic tumors
Osteosarcoma
Ewing's sarcoma
Soft tissue sarcomas
Germ cell, trophoblastic, other
gonadal neoplasms
Epithelial and unspecified
0-4
59,0
9,6
0,6
3,9
34,8
27,0
12,4
18,1
4,7
0,4
0,7
10,7
6,7
3,8
5-9
30,9
4,5
3,6
5,8
30,3
2,8
0,5
5,1
0,6
2,9
2,0
7,9
2,2
3,3
10-14
18,9
6,5
12,4
7,4
26,0
0,8
0,0
0,8
0,4
7,6
4,6
10,4
7,6
11,8
15-19
15,1
8,5
33,0
12,1
19,5
0,6
0,0
0,4
1,3
9,4
4,1
14,8
29,1
39,0
SOURCE: Cancer in North America, 1991-1995. North American Association of Central Cancer Registries. American Cancer Society, Surveillance
Research.
America's Children and the Environment: A First View of Available Measures
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APPENDIX B
Data Source
Descriptions
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Data Source Descriptions
Common Air Air Quality Exceedances
Pollutants EPA's Office of Air Quality Planning and Standards has set health-based National
Ambient Air Quality Standards (NAAQS) for six common pollutants, often referred to
as criteria pollutants. These standards are shown in Table 1 below.
State and local environmental agencies conduct air monitoring programs to measure
concentrations of these pollutants. The individual measurements are submitted to EPA
for inclusion in a national database called the Aerometric Information Retrieval System.
EPA, as part of its data management system, identifies instances in which levels of air pol-
lutants measured in the air are greater than the air quality standards. Each of these events
is called an "exceedance." An exceedance occurs when a measured concentration exceeds a
target value that is actually higher than the air quality standard. Concentrations measured
in the air must be averaged over a time period set in accordance with the standard for
that pollutant. The target values used to identify exceedances are shown in Table 1 below.
Table 1
National Ambient Air Quality Standards (NAAQS) and the
Values Used to Define Exceedances by EPA
llutant
Carbon monoxide
Nitrogen dioxide
Ozone
Lead
Particulate matter under 10 microns
Sulfur dioxide
duration of Standarc
Eight-hour average
One-hour average
One year average
One-hour average0
Eight-hour average
Three-month average
One-day (24 hour) average
One year average
One-day (24 hour) average
One year average
itandarc
9 ppm
35 ppm
0,053 ppm
0,12 ppm
0,08
1,5 |jg/m3
150 |jg/m3
50 pg/m3
0,14 ppm
0,03 ppm
Target value to
define exceedance
9,5 ppm
Not applicable
0,0535 ppm
0,125 ppm
Not applicable
1,55 |jg/m3
155
Not applicable
0,145 ppm
Not applicable
a The ozone 1-hour standard applies only to areas that were designated non-attainment when the ozone 8-hour standard was adopted in July 1997.
To use these data in measure El, for carbon monoxide and ozone, we identified coun-
ties in which air quality exceeded the one-hour standards at any time during the year.
For particulate matter and sulfur dioxide we identified counties in which the one-day
standards were exceeded at any time during the year. For nitrogen dioxide, we identi-
fied counties in which air quality exceeded the standard for the year, and for lead we
identified counties in which air quality exceeded the lead standard for a three-month
period.
Agency Contact:
David Mintz (mintz.david@epa.gov)
U.S. EPA, Office of Air Quality
Planning and Standards (OAQPS)
Tel: (919) 541-5224
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Data Source Descriptions
Air Quality Index
EPA uses the Air Quality Index (AQI) to evaluate daily air quality for five major pollu-
tants for which it has established NAAQS under the Clean Air Act. The AQI is an
update of the Pollutant Standards Index (PSI). Both indices convert the measured pol-
lutant concentration in a community's air to a number on a scale of 0 to 500. The
most important number on this scale is 100, which corresponds to the NAAQS for
each pollutant established under the Clean Air Act. A PSI or AQI level in excess of 100
means that a pollutant is in the unhealthy range on a given day; a PSI or AQI level at
or below 100 means that a pollutant reading is in the satisfactory range. Once these
levels are measured, the PSI or AQI figures are reported in all metropolitan areas of the
United States with populations exceeding 200,000. Data on the PSI are used in this
report, since we have historical data for the PSI. New data for the AQI will be incorpo-
rated as the data become available. Information on the AQI can be found at
http://www.epa.gov/airnow/aqibroch/.
Detailed information on the PSI data is presented in the following:
• The Pollutant Standards Index. EPA 451/K-94-001. February 1994, U.S.
Environmental Protection Agency, Office of Air Quality Planning and Standards,
Research Triangle Park, NC 27711. (Portions of this document are available on the
web at http://www.epa.gov/airprogm/oar/oaqps/psihold.html).
Agency Contact:
AIRS Hotline
U.S. EPA, Office of Air Quality
Planning and Standards (OAQPS)
Tel: (800) 334-2405
Hazardous Air Pollutants
The Cumulative Exposure Project, conducted by EPA's Office of Policy, Economics and
Innovation, estimated outdoor concentrations of 148 hazardous air pollutants for 1990.
EPA used a computer dispersion model, the Assessment System for Population
Exposure Nationwide (ASPEN), to estimate concentrations. ASPEN was developed as
part of the Cumulative Exposure Project and expands on standard EPA models by
including the capability to model a large number of pollutants across the entire conti-
nental United States. EPA combined ASPEN with an inventory of estimated 1990 haz-
ardous air pollutant emissions, from both mobile and stationary sources, to produce the
1990 ambient concentration estimates. The model's estimates were generally consistent
with the limited monitoring data available for hazardous air pollutants from 1990.
More information is available at http://www.epa.gov/CumulativeExposure.
To create the measures in this report, we started by calculating an average ambient con-
centration for each hazardous air pollutant in each county in 1990. This county-level
value was calculated by averaging together the ASPEN estimates for each of the census
tracts within each county. Then we compared the ambient concentration of each pollu-
tant in each county with health benchmark values. Benchmark values are drawn from
the lexicological literature and represent varying levels of potential concern for public
health. We then identified counties in which the estimated 1990 ambient concentra-
tion of any hazardous air pollutant was greater than the health benchmarks, and calcu-
lated the total number of children living in those counties.
Hazardous Air
Pollutants
Appendix B: Data Source Descriptions
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Data Source Descriptions
Agency Contact:
Daniel Axelrad (axelrad.daniel@epa.gov)
U.S. EPA, Office of Policy, Economics and Innovation
Tel: (202) 260-9363
Air Pollution Surveys on Radon Awareness and Environmental Tobacco Smoke Issues
In 1994 and 1996, EPA's Indoor Environments Division commissioned a commercial
contractor, Survey Communications, Inc., to conduct surveys on radon awareness and
environmental tobacco smoke issues. Approximately 31,000 households in the 50 states
were contacted in 1994 and 1996. All interviews were conducted by telephone using a
random digit dialing sampling methodology. Both the 1994 and the 1996 surveys
asked whether the household included any children under the age of 6. In addition,
they asked the following:
• Does anyone in your household smoke cigarettes, cigars, or a pipe?
• Do you allow anyone to smoke in your home on a regular basis?
In the 1994 survey, 6,41 1 households had children under the age of 6. In the 1996 sur-
vey, 6,851 households had children under the age of 6. The percentages of homes with
children under the age of six in which someone smokes, or in which someone smokes
regularly, were obtained by crossing the question on children with the appropriate
question on smoking in the household.
In 1 999, EPA commissioned the Center for Survey Research and Analysis at the University
of Connecticut to conduct a similar but much smaller survey. The results of this survey
were based on 1,005 telephone interviews with respondents located in the contiguous
48 states, using a random digit dialing sampling methodology. The survey questions
regarding smoking in the home were similar to the questions in the 1994 and 1996 sur-
veys. In the 1999 there were 225 households with children 6 years of age or younger survey.
Although the 1999 survey was substantially smaller than the 1994 and 1996 surveys, all
three surveys were designed to produce nationally representative samples.
Agency Contact:
Brian Gregory (gregory.brian@epa.gov)
U.S. EPA, Office of Air and Pvadiation
Tel: (202) 564-9024
Drinking Water Safe Drinking Water Information System (SDWIS)
Contaminants The Safe Drinking Water Information System (SDWIS) is the national regulatory com-
pliance database for EPA's drinking water program. SDWIS includes information on
the nation's 170,000 public water systems and data submitted by states and EPA
regions in conformance with reporting requirements established by statute, regulation,
and guidance.
EPA sets national standards for drinking water. These requirements take three forms:
maximum contaminant levels (MCLs, the maximum level of a specific contaminant that
can occur in drinking water), treatment techniques (specific methods that facilities must
follow to remove certain contaminants), and monitoring and reporting requirements
America's Children and the Environment: A First View of Available Measures
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Data Source Descriptions
(schedules that utilities must follow to report testing results). States report any viola-
tions of these three types of standards to EPA.
Water systems must monitor for contaminant levels on fixed schedules and report to
EPA when a maximum contaminant level has been exceeded. States also must report
when systems fail to meet specified treatment techniques. More information about the
maximum contaminant levels can be found online at
http://www.epa.gov/OGWDW/mcl.html.
EPA sets minimum monitoring schedules that drinking water systems must follow.
These minimum reporting schedules (systems may monitor more frequently) vary by
the size of the water system as well as by contaminant. Some contaminants are moni-
tored daily, others need to be checked far less frequently (every nine years is the longest
monitoring cycle). For example, at a minimum, drinking water systems will monitor
continuously for turbidity, monthly for bacteria, and once every four years for radionu-
clides. A monitoring and reporting violation occurs when the system did not perform
the required testing, take adequate samples, or report a violation as required. Only
major monitoring and reporting violations are used in this report.
SDWIS includes the total population served by each public water system and the state
in which the public water system resides. However, SDWIS does not include the num-
ber of children served. The numbers of children served by the public water systems
were estimated by determining the ratio of children in the state in which the public
water system resides and multiplying the ratio by the number of people served by that
public water system.
For additional information see the EPA's SDWIS website at
http://www.epa.gov/safewater/sdwisfed/sdwis.htm.
Agency Contact:
Abraham Siegel (siegel.abraham@epa.gov)
U.S. EPA Office of Ground Water and Drinking Water
Tel: (202) 260-2804
Pesticide Data Program
In 1991, the U.S. Department of Agriculture (USDA) was charged with implementing a
program to collect data on pesticide residues in food. The Pesticide Data Program (PDP)
has been in operation since 1991 and has published its findings for calendar years 1991
through 1998. PDP continues to focus on the National Academy of Sciences' 1993 rec-
ommendation that pesticide residue monitoring programs target foods that are highly
consumed by children, and that the analytical testing methods used in these monitoring
efforts should be standardized, validated, and subject to strict quality control and quality
assurance programs. Consequently, since 1994 PDP has modified its commodity testing
profile to include not only fresh fruits and vegetables, but also canned and frozen fruits
and vegetables, fruit juices, whole milk, wheat, soybeans, oats, corn syrup, peanut but-
ter, and poultry. In 1998, PDP collected and analyzed a total of 8,500 food samples,
including approximately 7,000 samples of fruits and vegetables. More information is
available at http://www.ams.usda.gov:80/science/pdp/index.htm
Each sample of food tested in the PDP is analyzed to determine whether the residues of
a variety of different pesticides are present. For the pesticide measure in this report, we
Pesticide Residues
in Foods
Appendix B: Data Source Descriptions
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Data Source Descriptions
assigned each sample to one of three groups: (1) no pesticides present at detectable levels;
(2) one pesticide present at detectable levels; and (3) two or more pesticides present at
detectable levels. The numbers of samples with one pesticide and the numbers with
multiple pesticides were totaled for each year 1994-98 and calculated as a percentage of
the total number of samples in each year.
Agency Contact:
Martha Lamont (Martha.Lamont@usda.gov)
USDA, Agricultural Marketing Service
Tel: (703) 330-2300
Land Contaminants Superfund NPL Assessment Program Database
The Superfund NPL Assessment Program (SNAP) is a relational database system con-
taining data for proposed, final, and deleted National Priorities List (NPL) sites. The
majority of the information contained in SNAP is the data that support the NPL list-
ing of sites; e.g., Hazard Pranking System (HRS) scoring factors, site narratives, site
characteristics, contaminants, locational information, proposed and final Federal
Register dates and citations, etc. For the most part, the data contained in SNAP are a
snapshot at the time of NPL proposal and listing, although SNAP also contains a mini-
mal amount of data (date and status) on Construction Completions, partial deletions,
and deletions. This information allows SNAP to give an accurate overall picture of the
status of the NPL on a real-time basis. All of the data contained in SNAP are publicly
available information.
The measures presented in this report made use of SNAP's information on each county
in which an NPL site is found and on the status of the NPL site—i.e., date proposed
for the NPL, date of final listing, date of Construction Completion, and date of dele-
tion. We then assembled data snapshots of the sites that were on the NPL on
September 30 of 1990, 1992, 1994, 1996, and 1998. In addition, a snapshot for
August 2000 (when information was obtained from SNAP for the purpose of assem-
bling these measures) was assembled. We developed two measures for each of these
dates. The first measure was based on all sites with either proposed or final listing on
the NPL as of the target date, but excluding those sites deleted from the NPL on or
before the target date. The second measure differed from the first in that sites that had
reached Construction Completion (but were not yet deleted from the NPL) also were
excluded. The counties with Superfund sites then were identified using the site location
information in SNAP.
Agency Contact:
Terry Jeng (jeng.terry@epa.gov)
U.S. EPA Office of Emergency and Remedial Response
Tel: (703) 603-8852
America's Children and the Environment: A First View of Available Measures
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Data Source Descriptions
National Health and Nutrition Examination Survey
Data on children's blood lead levels were obtained from the National Health and
Nutrition Examination Surveys (NHANES) II and III, conducted by the National
Center for Health Statistics. The survey is designed to assess the health and nutritional
status of the non-institutionalized civilian population of the United States, aged 2
months and older. NHANES collects data through both direct physical examinations
and interviews, using a complex multi-stage, stratified, clustered sampling design.
Interviewers obtain information on personal and demographic characteristics, including
age, household income, and race and ethnicity by self-reporting or as reported by an
informant. The first survey, NHANES I, was conducted during the periods 1971-1974
and 1974-1975; NHANES II covered the period 1976-1980; and NHANES III cov-
ered the period 1988-1994. Only NHANES II and III, however, contain data on blood
lead levels. Descriptions of the survey design, the methods used in estimation, and the
general qualifications of the data are presented in the following:
• Plan and Operation of the Second National Health and Nutrition Examination
Survey, 1976-80: Programs and Collection Procedures, Series 1, No. 15. Vital and
Health Statistics, Hyattsville, MD: National Center for Health Statistics.
• Plan and Operation of the Third National Health and Nutrition Examination
Survey, 1988-94: Series 1: Programs and Collection Procedures, No. 32. Vital and
Health Statistics, Hyattsville, MD: National Center for Health Statistics.
The percentage of children with blood lead levels greater than lOug/dL is influenced by
the proportion of nonresponses within each category. Families with incomes below the
poverty level had a lower response rate than families with incomes at or above the poverty
level. The percentages are thus the best estimates available, but contain some error.
NHANES Website: www.cdc.gov/nchs/nhanes.htm
Agency Contact:
Clifford Johnson (cljl@cdc.gov)
National Center for Health Statistics
Tel: (301) 45-4292
Concentrations of
Lead in Blood
National Health Interview Survey
Data on the prevalence of asthma and bronchitis are from the National Health
Interview Survey (NHIS), a continuing nationwide sample survey of the civilian non-
institutionalized population in which data are collected by personal household inter-
views. Interviewers obtain information on personal and demographic characteristics,
including race and ethnicity, by self-reporting or as reported by an informant.
Investigators also collect data about illnesses, injuries, impairments, chronic conditions,
activity limitation caused by chronic conditions, utilization of health services, and other
health topics. For most health topics, the survey collects data over an entire year.
The NHIS sample includes an over-sample of Black and Hispanic persons and is
designed to allow the development of national estimates of health conditions, health
service utilization, and health problems of the U.S. civilian non-institutionalized popu-
lation. Over the years, the response rate for the ongoing part of the survey has run
between 94 and 98 percent. In 1997, interviewers collected information on 36,116
persons, including 14,290 children.
Asthma and Chronic
Bronchitis
Appendix B: Data Source Descriptions
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Data Source Descriptions
Descriptions of the survey design, the methods used in estimation, and the general
qualifications of the data are presented in the following:
• Massey, J.T., T.E Moore, YL. Parsons, and W. Tadros 1989. Design and estimation
for the National Health Interview Survey, 1985-1994. Vital and Health Statistics 2
(110). Hyattsville, MD: National Center for Health Statistics.
• Benson, V. and M. Marano (1998 ). Current estimates from the National Health
Interview Survey, 1995. Vital and Health Statistics 10 (199). Hyattsville, MD:
National Center for Health Statistics.
NHIS Website: http://www.cdc.gov/nchs/nhis.htm
Agency Contact:
For information on activity limitations and general health status:
Laura Montgomery (Iem3@cdc.gov)
National Center for Health Statistics
Tel: (301) 436-3650
National Hospital Discharge Survey
Data on asthma hospitalizations were obtained from the National Hospital Discharge
Survey (NHDS). The NHDS is a national probability survey designed to meet the
need for information on characteristics of in-patients discharged from non-federal
short-stay hospitals in the United States. The NHDS collects data from a sample of
approximately 270,000 in-patient records acquired from a national sample of approxi-
mately 500 hospitals. Only hospitals with an average length of stay of fewer than 30
days for all patients, general hospitals, or children's general hospitals are included in the
survey. Federal, military, and Department of Veterans Affairs hospitals, as well as hospi-
tal units of institutions (such as prison hospitals), and hospitals with fewer than six
beds staffed for patient use, are excluded. Data from the NHDS are available annually.
NHDS Website: http://www.cdc.gov/nchs/about/major/hdasd/nhdsdes.htm
Agency contact:
Hospital Care Statistics Branch
National Center for Health Statistics
Tel: (301) 458-4321
Childhood CanCGT Surveillance, Epidemiology and End Results Program
The population-based data used for incidence of cancer are from the Surveillance,
Epidemiology and End Results (SEER) Program of the National Cancer Institute (NCI).
Information from five states (Connecticut, Hawaii, Iowa, New Mexico, and Utah) and
five metropolitan areas (Atlanta, Georgia; Detroit, Michigan; Los Angeles, California;
San Francisco-Oakland, California; and Seattle-Puget Sound, Washington) accounting
for approximately 14 percent of the United States' population are included. The partici-
pating regions were selected primarily for their ability to operate and maintain a popula-
tion-based cancer reporting system and for their epidemiologically significant population
subgroups. With respect to selected demographic and epidemiologic factors, they are,
when combined, a reasonably representative subset of the U.S. population.
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Data Source Descriptions
The mortality data for all cancer deaths among children in the United States are from
data based on underlying cause of death from the National Vital Statistics System,
administered by the National Center for Health Statistics. Mortality data are obtained
by NCI and provided for all causes of cancer.
All rates are age-adjusted to the 1970 U.S. standard population.
SEER Website: http://seer.cancer.gov
Agency Contact:
Surveillance, Epidemiology, and End Results Program
National Cancer Institute
U.S. Census County-Level Data Child Population Data
County population estimates are created by the U.S. Census Bureau starting with the
most recent decennial census figure (April 1, 1990) and updating that figure with
information on births, deaths, domestic migration (in/out flows with other counties in
the United States), and international migration (in/out flows with other countries) that
have occurred between the census date and the date of the population estimate.
The U.S. Census Bureau Population by Race and Age data are estimates of the resident
population of the counties in the United States, by age (ages 0 to 84, 85 and over), sex
(male, female), race (White; Black; American Indian, Eskimo and Aleut; Asian and
Pacific Islander) for July 1 of each year from 1990 to 1998. A complete description of
the population estimation methodology can be found on the Census Bureau's
Methodology for Estimates of State and County Total Population website at
http://www.census.gov/population/methods/stco99.txt and on the Census Bureau's
Methodology for Estimating County Population by Age and Race website at
http://www.census.gov/population/estimates/county/casrh_doc.txt.
Agency Contact:
U.S. Census Bureau
Population Estimates Branch
Tel: (301) 457-2385
http://www.census.gov/population/www/estimates/countypop.html
Appendix B: Data Source Descriptions
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APPENDIX C
Environmental
Health Objectives
in Healthy
People 2010
-------
Environmental Health Objectives in Healthy People 2010
ealthy People 2010, an initiative coordinated by the U.S. Department of Health
and Human Services, Office of Disease Prevention and Health Promotion, estab-
lishes national health objectives for the first decade of the new millennium. Launched
in January 2000, Healthy People 2010 seeks to increase the quality and number of
years of healthy life and to eliminate health disparities among Americans.
Healthy People 2010 includes a number of goals and objectives that relate to the children's
environmental health risks considered in America's Children and the Environment.
Objective 8-1 of Healthy People 2010 aims to reduce the proportion of persons
exposed to air that fails to meet EPA's health-based standards for criteria air pollutants.
The goal is to reduce the number of exceedances of the standards for carbon monoxide,
nitrogen dioxide, sulfur dioxide, and lead from their present levels to zero by 2010.
Exceedances for ozone would be reduced to zero by 2012, and particulate matter
(10mm or less in diameter) by 2018.
Objective 8-4 focuses on reducing emissions of hazardous air pollutants. Healthy
People 2010's goal is a 75 reduction in hazardous air pollutant releases by 2010, from
8.1 million tons nationally in 1993 to 2 million tons in 2010.
Objective 8-5 aims to increase the proportion of persons served by community water
systems with drinking water that meets the regulations of the Safe Drinking Water Act
to 95 percent by 2010, compared with 85 percent in 1995.
Objective 8-11 aims to eliminate elevated blood lead levels in children by 2010. Lead
poisoning remains a preventable environmental problem in the United States.
Objective 8-12 addresses health risks associated with exposure to hazardous waste sites.
This objective seeks to remediate 98 percent of the hazardous waste sites listed as
National Priority List (Superfund) sites, Resource Conservation and Recovery Act facil-
ities, leaking underground storage facilities, and brownfield properties.
Objective 24-2a seeks to reduce asthma-related hospitalizations of children under 5
from 45.6 hospitalizations per 10,000 children in 1998 to 25 per 10,000 in 2010.
Objective 27-9 aims to reduce the percentage of children regularly exposed to second-
hand smoke from the 27 percent reported in 1994 to 10 percent by 2010.
Healthy People 2010 is available at www.health.gov/healthypeople or by calling
1(800)367-4725.
America's Children and the Environment: A First View of Available Measures
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Tips to Protect Children from Environmental Hazards
Help children breathe easier
• Don't smoke or let others smoke in your home or car.
• Keep your home as clean as possible. Dust, mold,
certain household pests, secondhand smoke, and pet
dander can trigger asthma attacks and allergies.
• Limit outdoor activity when air pollution is bad, such
as on ozone alert days.
Protect children from lead poisoning
• Wash children's hands before they eat, and wash
bottles, pacifiers, and toys often.
• Wash floors and window sills to protect kids from
dust and peeling paint contaminated with lead—
especially in older homes.
• Run the cold water for 30 seconds to flush lead from
pipes before drawing water to drink.
• Get kids tested for lead—check with your doctor.
• Test your home for lead paint hazards if it was built
before 1978.
Protect children from carbon monoxide
(CO) poisoning
• Have fuel-burning appliances, furnace flues, and
chimneys checked once a year.
• Never use gas ovens or burners for heat and never use
barbeques/grills indoors or in the garage.
• Never sleep in rooms with unvented gas or kerosene
space heaters.
• Don't run cars or lawnmowers in the garage.
• Install a UL approved CO detector in sleeping areas.
Keep pesticides and other toxic
chemicals away from children
• Put food and trash away in closed containers to keep
pests from coming into your home.
• Don't use pesticides if you don't have to—look for
alternatives.
• Read product labels and follow directions.
• Use bait and traps instead of bug sprays when you can,
and place the bait and traps where kids can't get them.
• Store chemicals where kids can't reach them and never
put them in other containers that kids can mistake for
food or drink.
• Keep children, toys, and pets away when using
pesticides and don't let kids play in fields, orchards
and gardens after pesticides have been used.
• Wash fruits and vegetables under running water before
eating—peel them when possible.
Protect children from too much sun
• Have them wear hats, sunglasses, and protective clothing.
• Use sunscreen on kids older than 6 months and keep
infants out of the sun.
• Keep children out of the mid-day sun—the sun is
most intense between 10 and 2.
Safeguard them from high levels of radon
• Test your home for radon with a home test kit.
• Fix your home if your radon level is 4 pCi/L or
higher. If you need help, call your state radon office
or 1-800-644-6999.
Protect children from contaminated fish
and polluted water
• Call the local or state health department to learn
about any beach closings or local advisories limiting
the amount of fish to be eaten.
• Take used motor oil to a recycling center and properly
dispose of toxic household chemicals.
• Find out what's in your local drinking water—call
your local water system for your annual drinking
water quality report, or if you have a private home
drinking water well, test it every year.
For more information call:
1 877 590 KIDS
www.epa.gov/children
EPA Office of Children's Health Protection
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