Biomonitoring and EPHT Download as PDF [1.2 MB]
Linking: Hazards, Exposures, & Health Effects
Environmental Public Health Tracking is the ongoing collection, integration, analysis, interpretation, and dissemination of data on environmental hazards, exposures to those hazards, and related health effects. The goal of tracking is to provide information that can be used to plan, apply, and evaluate actions to prevent and control environmentally related diseases. In many cases, however, data are not available on what substances are getting into people and at what levels (exposure data).
Biomonitoring—the direct measurement of chemicals in human specimens such as blood or urine—is a powerful tool essential for closing the gaps in exposure data. CDC and its partners, including the Association of Public Health Laboratories (APHL), are supporting state and local agencies in building their tracking and biomonitoring capacity.
Mercury: Released into the air by industrial processes, mercury enters surface water, where it can bioaccumulate in fish tissue as methylmercury, its most toxic form.
What are environmental hazards?
An environmental hazard is an agent or factor in the environment that may adversely affect human health. People can be exposed to physical, chemical, or biologic agents from various environmental sources through air, water, soil, and food.
Examples of environmental hazards include the following:
- Criteria Air Pollutants: These pollutants
include lead, particulate matter, carbon monoxide, nitrogen and sulfur
dioxides, lead, and ozone.
- Arsenic: Arsenic can be found naturally in
many states’ groundwater and in runoff from agricultural, industrial,
and mining operations.
- Lead: Lead can be found in paint in some
U.S. homes built before 1978, some hazardous waste and industrial sites,
and some imported products.
- Pesticides: When misused, agricultural and
home-use pesticides, which include chemicals such as organophosphates,
carbamates, and pyrethrins, can be hazardous.
- Hazardous Waste Sites: Physical, chemical,
and biologic hazards from waste sites can enter the air, soil, water,
- Temperature Extremes: Extreme cold or heat
can disrupt normal body functions.
- Biotoxins: Some microorganisms produce and release poisons called biotoxins into air, water, soil, or food.
Methylmercury: Fish consumption is the primary source of methylmercury exposure in people. Total blood mercury is a biomarker of methylmercury exposure.
What is biomonitoring?
Biomonitoring is the assessment of exposure through direct measurement of environmental chemicals or their metabolites in human specimens such as blood or urine. CDC is working with partners such as APHL to increase biomonitoring capacity at the state and local level.
CDC’s National Report on Human Exposure to Environmental Chemicals
The Report is an ongoing assessment of the U.S. population’s exposure to environmental chemicals. Scientists at CDC’s Environmental Health Laboratory use biomonitoring to assess this exposure in samples from people who took part in the National Health and Nutrition Examination Survey.
Two Important Findings in the Report:
- DDT: Banned by the Environmental
Protection Agency in 1973, this pesticide was clearly measurable in
teens and young adults aged 12-19 years who were born after DDT was
banned. For people of all ages, levels were three times as high in
Mexican Americans as in whites and twice as high as in African
- Lead: Elevated blood lead levels in young children have decreased by 50% since the early 1990s, but public health concern remains about children who are still exposed to lead-based paint and lead-contaminated dust.
Neurological Defects: Exposure of the fetus to mercury during pregnancy can result in neurological abnormalities ranging from cerebral palsy to learning disorders.
What are health effects?
Health effects are chronic or acute health conditions that affect the wellbeing of an individual or community. Effects are measured in terms of illness and death and understood in terms of environmental, psychological, physiological, or genetic factors and conditions that predispose an individual to the development of a disease or health condition.
Examples of health effects include the following:
- Birth defects: One in 33 U.S. babies born
has a birth defect.
- Developmental disabilities: About 17% of
children under 18 years of age have a developmental disability.
- Cancer: More than 1 million new cancer
cases were diagnosed in 2001.
- Chronic respiratory disease: An estimated
10 million adults reported physician-diagnosed chronic obstructive
pulmonary diseases in 2000.
- Asthma: In 2001, an estimated 31.3 million
Americans reported having been diagnosed with asthma during their
- Neurologic diseases: Neurologic disorders
strike an estimated 50 million Americans each year.
- Childhood lead poisoning: Approximately
434,000 U.S. children aged 1-5 years have elevated blood lead levels.
- Carbon monoxide poisoning: More than 500 Americans die from unintentional carbon monoxide poisoning each year.
CDC is providing national leadership to develop integrated biomonitoring and health tracking programs at the state and local level.
- Biomonitoring: CDC awarded $1.9 million in
implementation funds to 8 states (3 grantee states plus 5 states that
are a part of a consortium). Funds were awarded in September, 2003.
- Tracking: In 2003, CDC awarded $18.8
million to 21 states, 3 local health departments, and 3 schools of
public health to continue developing a national environmental public
health tracking network and to increase capacity in environmental public
health at the state and local levels.
- Iowa, Minnesota, North Dakota, South Dakota, and
Wisconsin: A biomonitoring consortium of 5 Upper Midwest
states would use a biomonitoring communication module within Wisconsin’s
Health Alert Network, which is being integrated into Wisconsin’s
Environmental Public Health Tracking System. The 5 states also intend to
share biomonitoring data and samples on toxicants such as metals and
- Pennsylvania: Pennsylvania’s biomonitoring
planning grant currently funds an epidemiology research associate in the
state’s Bureau of Epidemiology. This position is responsible for
supporting biomonitoring as well as environmental health tracking and
establishing a working relationship between the two. People living in
the vicinity of coal-burning power plants will be evaluated and tracked
for heavy metal exposure including lead, arsenic, and mercury.
- Washington: Washington’s primary tracking project involves enhancing the Washington Electronic Disease Surveillance System’s electronic hospital reporting of birth defects, the development of population-based exposure data—including a state biomonitoring program, and the enhancement of environmental monitoring and data analyses of persistent toxicants such as mercury and Polychlorinated Biphenyls (PCBs).
Environmental Health Program
Association of Public Health Laboratories
2025 M Street NW, Suite 550
Washington, DC 20036-3320