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- Definition: Number of days with ground-level ozone concentrations above the U.S. standard of 0.070 parts per million (e.g., in 2016, ozone concentrations above the U.S. standard were recorded on 60 days in Los Angeles County). For counties, data from monitoring sites recording the most days above the standard are shown. State-level data are averaged from county-level data and should be treated with caution.
- Data Source: California Environmental Protection Agency, Air Resource Board: (iADAM) Air Quality Data Statistics (Aug. 2017).
- Footnote: Ozone concentrations are measured and averaged over 8-hour testing periods; then, the number of days per year exceeding the standard is calculated. Ground-level ozone is formed from pollutants emitted from cars, power plants, and other sources. Data are limited because (i) monitoring stations are usually in urban areas, and (ii) ozone samples are taken every three days or during times of the year when air pollution is very high. In addition, not all counties are monitored, and data are only provided for counties with monitors that pass completeness criteria. N/A means that data are not available.
- Measures of Air Quality on Kidsdata.org
Kidsdata.org offers the following measures of air quality:Note: The information presented in this topic is not exhaustive of all relevant data and has limitations. For example, air quality is not monitored in all counties, which makes computing state-level figures problematic. In addition, indoor air quality, an important factor in children's environmental health, is not measured on kidsdata.org.
These data are offered in order to draw attention to the environmental influences on children's health and to encourage exploration of the issues. Indicators will be revised as new data emerge.
- Air Quality
- Lead Poisoning
- Water Quality
- Why This Topic Is Important
Air pollution is a serious environmental threat to children’s health (1). Recent research has shown that environmental contaminants can put children at risk of developing serious illnesses (2). Exposure to air pollution, especially at high concentrations and durations, is related to increased risk of respiratory problems, heart disease, cancer, and adverse reproductive or pregnancy outcomes, among other health problems (1, 2, 3). Children are more vulnerable to pollutants because, compared to adults, they breathe more air relative to their size, and thus experience greater proportionate exposure to chemicals (2). In addition, children are at greater risk of harm from contaminants because their bodies and organs are not fully developed (2).
Air pollution can occur outdoors or indoors. Examples of outdoor pollutants include fine particles in the air (from motor vehicles, industrial sources, etc.), ground-level ozone (a primary component of smog), noxious gases, and tobacco smoke (3). Examples of indoor air pollution include carbon monoxide, household chemicals, building materials, allergens (e.g., cockroaches, animals, dust, etc.), mold, and tobacco smoke (3). Among common outdoor air pollutants, fine particulate matter and ground-level ozone are considered the most widespread threats to human health, according to the U.S. Environmental Protection Agency (4).For more information about air quality, see kidsdata.org’s Research & Links section.
Sources for this narrative:
1. Centers for Disease Control and Prevention. (2017). Health impacts of fine particles in air. Retrieved from: http://ephtracking.cdc.gov/showAirHIA.action
2. California Environmental Health Tracking Program. (2015). Costs of environmental health conditions in California children. Public Health Institute. Retrieved from: http://www.phi.org/resources/?resource=cehtpkidshealthcosts
3. National Institute of Environmental Health Sciences. (2017). Air pollution. Retrieved from: http://www.niehs.nih.gov/health/topics/agents/air-pollution
4. U.S. Environmental Protection Agency. (2017). Criteria air pollutants. Retrieved from: https://www.epa.gov/criteria-air-pollutants
- How Children Are Faring
Ground-level ozone—a primary component of smog which is formed from pollutants emitted by cars, power plants, and other sources—poses considerable health risks. In 2016, California counties averaged 22 days with ozone concentrations above the U.S. regulatory standard, down from 44 days in 1980. Of the 49 California counties with data in 2016, 13 did not record any days when ozone levels exceeded regulatory standards. However, six counties, all in Southern California and the Central Valley, recorded 60 or more such days.
Despite year-to-year fluctuations, California’s annual average concentration of fine particulate matter (PM 2.5) in the air has declined overall, from 17.6 micrograms per cubic meter (µg/m³) in 1999 to 9 µg/m³ in 2016, echoing national trends. PM 2.5 levels also vary widely among counties for which data are available; in 2016, the annual average concentration of PM 2.5 ranged from 2.9 µg/m³ in Lake County—well below the federally recommended limit of 12 µg/m³—to 15.9 µg/m³ in Kern County.Note: Children’s environmental health is an emerging area of research, and the data currently available give a limited picture of how children in California are faring. In many cases, county-level data are not specific enough to inform conclusions about children’s health risks, but they can spark further inquiry.
- Policy Implications
Pound for pound, children are more vulnerable to toxic chemicals in the environment when compared to adults (1, 2). Exposure to air pollutants may lead to long-term health problems, including respiratory diseases, cancer, and heart disease (1, 2, 3, 4). Indoor air quality at home and in child care and school settings is also critically important, as it has been shown to affect children’s health and academic performance (2).
Policy options to improve air quality, and children’s environmental health overall, include:
For more information on air quality and children’s environmental health, see kidsdata.org’s Research & Links section, or visit the U.S. Environmental Protection Agency, the California Environmental Health Tracking Program, or the Children’s Environmental Health Network. Also see policy implications for Asthma on kidsdata.org.
- Continuing to enforce and strengthen laws and regulations that limit the generation of vehicle emissions and other contaminants, along with agricultural and industrial practices that cause air pollution and pesticide exposure (2, 5)
- Improving and promoting effective implementation of policies and guidelines that control indoor air quality in schools and child care settings, addressing issues such as mold, chemical exposure, pest control, building ventilation, and hazardous building materials (6, 7)
- Focusing broadly on multiple deficiencies and hazards in housing environments and early childhood settings—e.g., advancing strategic partnerships among organizations focused on health, housing, education, and environmental protection—rather than focusing on single factors, such as lead exposure (6, 8)
- Supporting public education about the health risks of poor indoor environments and how to make improvements; also, supporting workforce development, training, and assistance for professionals in multiple sectors (e.g., housing, child care, etc.) to address indoor health hazards (6, 8)
- Continuing to support research on the connections between the environment and children’s health, as well as effective strategies to improve environmental health (2, 6, 8)
Sources for this narrative:
1. California Environmental Health Tracking Program. (2015). Costs of environmental health conditions in California children. Public Health Institute. Retrieved from: http://www.phi.org/resources/?resource=cehtpkidshealthcosts
2. U.S. Environmental Protection Agency. (2013). America’s children and the environment (3rd ed.). Retrieved from: https://www.epa.gov/ace
3. Centers for Disease Control and Prevention. (2017). Health impacts of fine particles in air. Retrieved from: http://ephtracking.cdc.gov/showAirHIA.action
4. National Institute of Environmental Health Sciences. (2017). Air pollution. Retrieved from: http://www.niehs.nih.gov/health/topics/agents/air-pollution
5. California Environmental Protection Agency, Air Resources Board. (2017). Laws and regulations. Retrieved from: http://www.arb.ca.gov/html/lawsregs.htm
6. Environmental Law Institute, & Children’s Environmental Health Network. (2015). Reducing environmental exposures in child care facilities: A review of state policy. Retrieved from: http://www.eli.org/buildings/reducing-environmental-exposures-child-care-facilities
7. U.S. Environmental Protection Agency. (2016). State school environmental health guidelines. Retrieved from: https://www.epa.gov/schools/read-state-school-environmental-health-guidelines
8. Centers for Disease Control and Prevention. (2015). Healthy homes. Retrieved from: http://www.cdc.gov/nceh/lead/healthyhomes.htm
- Websites with Related Information
- Air Quality. Centers for Disease Control and Prevention.
- Air Topics. U.S. Environmental Protection Agency.
- California Air Resources Board
- Children’s Environmental Health Network
- Children's Health. California Office of Environmental Health Hazard Assessment.
- Creating Healthy Indoor Air Quality in Schools. U.S. Environmental Protection Agency.
- Environmental Health Perspectives. National Institute of Environmental Health Sciences.
- Health Effects Institute
- Moms Clean Air Force
- National Institute of Environmental Health Sciences: Air Pollution
- Protecting Children’s Environmental Health. U.S. Environmental Protection Agency.
- State of Global Air. Health Effects Institute.
- State of the Air. American Lung Association.
- Tracking California: Air Quality
- Key Reports and Research
- Association Between Outdoor Air Pollution and Childhood Leukemia: A Systematic Review and Dose-Response Meta-Analysis. (2019). Environmental Health Perspectives. Filippini, T., et al.
- Associations Between Ozone and Fine Particulate Matter and Respiratory Illness Found to Vary Between Children and Adults: Implications for U.S. Air Quality Policy. (2019). American Journal of Respiratory and Critical Care Medicine. English, P., & Balmes, J.
- Brain Fog: Does Air Pollution Make Us Less Productive? (2019). Environmental Health Perspectives. Schmidt, S.
- Community Air Protection Blueprint. (2018). California Air Resources Board.
- Decomposition Analysis of Black-White Disparities in Birth Outcomes: The Relative Contribution of Air Pollution and Social Factors in California. (2017). Environmental Health Perspectives. Benmarhnia, T., et al.
- Emission Data Show That Black People Are Most Exposed to Air Pollution. (2018). American Journal of Public Health. Mikati, I., et al.
- Estimating the Proportion of Childhood Cancer Cases and Costs Attributable to the Environment in California. (2017). American Journal of Public Health. Nelson, L., et al.
- Exposure to Secondhand Smoke Among Nonsmokers – United States, 1988-2014. (2018). Centers for Disease Control and Prevention, Morbidity and Mortality Weekly Report. Tsai, J., et al.
- Reducing Indoor Exposure to Particle Pollution from Outdoor Sources: Policies and Programs for Improving Air Quality in Homes. (2020). Environmental Law Institute. Bernstein, T.
- Report to the Legislature and Governor: Children’s Environmental Health Center. (2019). California Environmental Protection Agency, Office of Environmental Health Hazard Assessment. Blumenfeld, J., & Zeise, L.
- Retirements of Coal and Oil Power Plants in California: Association with Reduced Preterm Birth Among Populations Nearby. (2018). American Journal of Epidemiology. Casey, J. A., et al.
- Secondhand Smoke Exposure and Asthma Outcomes Among African-American and Latino Children with Asthma. (2018). Thorax. Neophytou, A. M., et al.
- The Cost of Premature Birth from Preventable Air Pollution in California. (2018). Tracking California & Public Health Institute.
- Trouble in the Air: Millions of Americans Breathed Polluted Air in 2018. (2020). Environment America Research & Policy Center, U.S. PIRG Education Fund, & Frontier Group. Ridlington, E., et al.
- Wildfire Smoke: A Guide for Public Health Officials. (2019). California Air Resources Board, California Office of Environmental Health Hazard Assessment, Centers for Disease Control and Prevention, U.S. Forest Service, & U.S. Environmental Protection Agency. Stone, S. L., et al.
- County/Regional Reports
- 2017 Sustainable LA Grand Challenge Environmental Report Card for Los Angeles County Energy and Air Quality. (2017). UCLA, Sustainable LA Grand Challenge. Federico, F., et al.
- Children’s Health Study. University of Southern California.
- Community Health Improvement Plan for Los Angeles County 2015-2020. Los Angeles County Dept. of Public Health.
- Key Indicators of Health by Service Planning Area. (2017). Los Angeles County Dept. of Public Health.
- Longitudinal Analysis of Particulate Air Pollutants and Adolescent Delinquent Behavior in Southern California. (2018). Journal of Abnormal Child Psychology. Younan, D., et al.
- Orange County Community Indicators Report. Orange County Community Indicators Project.
- San Mateo County All Together Better. San Mateo County Health.
- The Association of Ambient Air Pollution and Traffic Exposures with Selected Congenital Anomalies in the San Joaquin Valley of California. (2013). American Journal of Epidemiology. Padula, A. M., et al.
- The Imperial County Community Air Monitoring Network: A Model for Community-based Environmental Monitoring for Public Health Action. (2017). Environmental Health Perspectives. English, P. B., et al.
- Youth Engaged Participatory Air Monitoring: A ‘Day in the Life’ in Urban Environmental Justice Communities. (2020). International Journal of Environmental Research and Public Health. Johnston, J. E., et al.
- More Data Sources For Air Quality
- Air Data: Air Quality Data Collected at Outdoor Monitors Across the U.S. U.S. Environmental Protection Agency.
- Air Quality and Meteorological Information System (AQMIS) California Air Resources Board.
- America’s Children and the Environment. U.S. Environmental Protection Agency.
- California Communities Environmental Health Screening Tool (CalEnviroScreen) California Office of Environmental Health Hazard Assessment.
- iADAM: Air Quality Data Statistics. California Air Resources Board.
- National Environmental Public Health Tracking Network. Centers for Disease Control and Prevention.
- National Report on Human Exposure to Environmental Chemicals. (2019). Centers for Disease Control and Prevention.
- Understanding the Health of Our Communities. California Air Resources Board.
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