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- Definition: Annual average concentration of fine particulate matter in the air (e.g., in 2019, the average concentration of fine particulate matter in the air in Los Angeles County was 11 micrograms per cubic meter).
- Data Source: California Air Resources Board, iADAM: Air Quality Data Statistics; U.S. Environmental Protection Agency, Particulate Matter (PM2.5) Trends (Dec. 2020).
- Footnote: 'Fine particulate matter' (PM2.5) refers to particles with a diameter of less than 2.5 microns. PM2.5 is an air pollutant commonly found in diesel exhaust. The national ambient air quality standard for PM2.5 is 12 micrograms per cubic meter (µg/m³); annual concentrations above 12 µg/m³ are considered unhealthy, especially for sensitive groups such as children, asthmatics, and the elderly. Data are limited because (i) monitoring stations are usually in urban areas, and (ii) PM2.5 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 meet completeness criteria. State-level data are averaged from county-level data and should be treated with caution. N/A means that data are not available.
Learn More About Air Quality
- Measures of Air Quality on Kidsdata.org
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Kidsdata.org offers two measures of outdoor air quality related to criteria air pollutants:
- The annual average concentration of fine particulate matter (PM2.5) in the air
- The number of days per year with unhealthy ground-level ozone concentrations (i.e., above the national standard of 0.070 parts per million)
Note that data presented in this topic are not comprehensive and have limitations. Carbon monoxide, lead, nitrogen dioxide, and sulfur dioxide—other criteria air pollutants impacting overall outdoor air quality—are not measured, nor is indoor air quality, which also poses health risks. In addition, PM2.5 and ozone are not monitored in all counties, creating a challenge for calculating state-level figures. -
- Air Quality
- Asthma
- Lead Poisoning
- Water Quality
- Why This Topic Is Important
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Air pollution is a serious threat to children's health, with links to adverse birth outcomes, obesity, cardiovascular and respiratory diseases, and cancer (1, 2). Long-term effects also can extend beyond physical health—exposure to contaminants, especially at high concentrations and durations, is associated with deficits in cognitive and behavioral development (1, 2). Children are more vulnerable to air pollution than adults, and younger children more vulnerable than older children, because their bodies and organs are less fully developed, and they breathe more air relative to their size, resulting in greater proportionate exposure (1, 2, 3). They also may experience greater exposure due to childhood activities like outdoor play (3).
Air pollution can occur outdoors or indoors. Motor vehicles and industrial facilities are major sources of common outdoor air pollutants, such as ground-level ozone (a main component of smog), fine particulate matter, lead, and noxious gases (1, 4). These pollutants can flow indoors, where the air may be further polluted by fuel-burning stoves and appliances, household chemicals, building materials, and tobacco smoke (1, 5). Among common outdoor air pollutants, fine particulate matter and ground-level ozone are considered the greatest threats to human health (4).For more information, see kidsdata.org’s Research & Links section.
Sources for this narrative:
1. World Health Organization. (2018). Air pollution and child health: Prescribing clean air. Retrieved from: https://www.who.int/ceh/publications/air-pollution-child-health/en
2. Larr, A. S., & Neidell, M. (2016). Pollution and climate change. The Future of Children, 26(1), 93-113. Retrieved from: https://futureofchildren.princeton.edu/sites/futureofchildren/files/media/children_and_climate_change_26_1_full_journal.pdf
3. Children's Environmental Health Network. (n.d.). Why do policies need to specifically consider children? Retrieved from: https://cehn.org/our-work/policy/policy-factsheets/why-do-policies-need-to-specifically-consider-children
4. U.S. Environmental Protection Agency. (n.d.). Managing air quality - Air pollutant types. Retrieved from: https://www.epa.gov/air-quality-management-process/managing-air-quality-air-pollutant-types
5. U.S. Environmental Protection Agency. (n.d.). Introduction to indoor air quality. Retrieved from: https://www.epa.gov/indoor-air-quality-iaq/introduction-indoor-air-quality - How Children Are Faring
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In 2019, the average air concentration of fine particulate matter (PM2.5) across California counties was 8.1 micrograms per cubic meter (µg/m³), a drop of more than 50% compared with 1999 (17.6 µg/m³). This decrease at the state level echoes national trends. At the county level, six of the 44 counties with data in 2019—all in Southern California and the Central Valley—recorded average PM2.5 concentrations above the national public health standard of 12 µg/m³.
Of the 49 California counties with ground-level ozone data in 2019, 15 did not record any days when ozone concentrations exceeded the current national regulatory standard of 0.070 parts per million (ppm), whereas six recorded more than 30 such days. Forty years earlier, 17 counties recorded 30 or more days above 0.070 ppm. - Policy Implications
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Air pollution is a critical public health issue (1). Children, due to their developing bodies and greater air intake relative to body weight, are more vulnerable to air pollutants than adults (1, 2). Exposure to pollutants in the womb, in the home, or in the community may cause serious, lasting health problems and limit children's physical and cognitive development, academic performance, and economic productivity in adulthood (1, 3).
California is considered a leader in air quality policy, with strong regulations addressing vehicle and industrial emissions, secondhand smoke, building practices, and other contributors to outdoor and indoor air pollution (4, 5, 6). Still, the state is home to many of the most polluted cities in the nation, with low-income communities and people of color at higher risk of exposure to air pollution than other groups (6, 7). While significant progress has been made, much more work is needed to ensure that all California children consistently have clean air to breathe and healthy environments in which to grow and thrive (7, 8).
Policy and program options to improve air quality, and children's environmental health overall, include continuing to:- Enforce and strengthen laws and regulations limiting the generation of vehicle emissions and other contaminants, along with agricultural and industrial practices that cause air pollution and pesticide exposure; as part of this, maximizing community-based action to help address local pollution burdens, in accordance with state law (4, 8)
- Promote effective strategies to decrease exposure to wildfire smoke in vulnerable communities, such as providing cleaner air shelters and public education on wildfire preparedness and appropriate use of air conditioners and filters (9)
- Enforce and expand local and state policies to reduce secondhand smoke exposure, particularly in multi-unit housing settings (5)
- Improve and implement policies and guidelines that improve indoor air quality in homes, schools, and child care settings, addressing issues such as ventilation, mold, pests, hazardous building materials, chemical exposure, and outdoor sources of pollutants (6, 10, 11)
- Support public education and professional workforce training in multiple sectors (e.g., housing, child care, health care, etc.) on the risks of unhealthy indoor environments and how to make improvements (10, 11)
- Encourage a broad focus on multiple environmental hazards—e.g., advancing strategic partnerships among state and local organizations focused on health, housing, education, land use planning, transportation, and environmental protection—rather than focusing on single sectors or contaminants (8, 10, 11)
- Increase overall awareness among health care professionals, policymakers, advocates, and others regarding children's environmental health, including the effects of contaminants on children, as well as the disproportionate burdens faced by some communities (7, 8)
- Support additional research on the connections between the environment and children's health, and strategies to prevent and address adverse effects; also, maintaining and strengthening environmental health data systems to continue closing information gaps (8)
For more information on this topic, see kidsdata.org’s Research & Links section or visit the U.S. Environmental Protection Agency, Tracking California, and the California Air Resources Board. Also see policy implications for Asthma and other Environmental Health topics on kidsdata.org.
Sources for this narrative:
1. World Health Organization. (2018). Air pollution and child health: Prescribing clean air. Retrieved from: https://www.who.int/ceh/publications/air-pollution-child-health/en
2. Children's Environmental Health Network. (n.d.). Why do policies need to specifically consider children? Retrieved from: https://cehn.org/our-work/policy/policy-factsheets/why-do-policies-need-to-specifically-consider-children
3. Larr, A. S., & Neidell, M. (2016). Pollution and climate change. The Future of Children, 26(1), 93-113. Retrieved from: https://futureofchildren.princeton.edu/sites/futureofchildren/files/media/children_and_climate_change_26_1_full_journal.pdf
4. California Air Resources Board. (n.d.). Laws and regulations. Retrieved from: https://ww2.arb.ca.gov/resources/documents/laws-and-regulations
5. Vuong, T. D., et al. (2019). California tobacco facts and figures 2019. California Department of Public Health. Retrieved from: https://www.cdph.ca.gov/Programs/CCDPHP/DCDIC/CTCB/CDPH%20Document%20Library/ResearchandEvaluation/FactsandFigures/CATobaccoFactsandFigures2019.pdf
6. Bernstein, T. (2020). Reducing indoor exposure to particle pollution from outdoor sources: Policies and programs for improving air quality in homes. Environmental Law Institute. Retrieved from: https://www.eli.org/research-report/reducing-indoor-exposure-particle-pollution-outdoor-sources-policies-and-programs-improving-air-quality-homes
7. Tracking California. (n.d.). Who is vulnerable to air contaminants? Retrieved from: https://trackingcalifornia.org/air-quality/who-is-vulnerable-to-air-contaminants
8. California Office of Environmental Health Hazard Assessment. (2019). Report to the legislature and governor: Children's environmental health program. Retrieved from: https://oehha.ca.gov/media/downloads/risk-assessment/report/childrencenterlegreport082619.pdf
9. Stone, S. L., et al. (2019). Wildfire smoke: A guide for public health officials. California Air Resources Board, et al. Retrieved from: https://www.airnow.gov/wildfire-smoke-guide-publications
10. Bernstein, T. (2018). Addressing environmental site hazards at child care facilities: A review of state policy strategies. Environmental Law Institute. Retrieved from: https://www.eli.org/research-report/addressing-environmental-site-hazards-child-care-facilities-review-state-policy-strategies
11. U.S. Environmental Protection Agency. (2019). State school environmental health guidelines. Retrieved from: https://www.epa.gov/schools/read-state-school-environmental-health-guidelines - Research & Links
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- Websites with Related Information
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- California Air Resources Board
- California Office of Environmental Health Hazard Assessment: Children's Environmental Health Center
- Centers for Disease Control and Prevention: Air Quality
- Children’s Environmental Health Network
- Creating Healthy Indoor Air Quality in Schools. U.S. Environmental Protection Agency.
- Environmental Health Perspectives
- Health Effects Institute
- National Institute of Environmental Health Sciences: Air Pollution and Your Health
- Protecting Children’s Environmental Health. U.S. Environmental Protection Agency.
- State of the Air. American Lung Association.
- Tracking California: Air Quality
- U.S. Environmental Protection Agency: Air Topics
- Key Reports and Research
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- 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.
- Disparities in Distribution of Particulate Matter Emission Sources by Race and Poverty Status. (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). 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 Program. (2019). California Office of Environmental Health Hazard Assessment.
- 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.
- State of Global Air. (2020). Health Effects Institute.
- The Cost of Premature Birth from Preventable Air Pollution in California. (2018). Tracking California.
- Trouble in the Air: Millions of Americans Breathed Polluted Air in 2018. (2020). Environment America Research and Policy Center, et al. Ridlington, E., et al.
- Wildfire Smoke: A Guide for Public Health Officials. (2019). California Air Resources Board, et al. Stone, S. L., et al.
- County/Regional Reports
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- Children’s Health Study. University of Southern California.
- Community Health Equity Improvement Plan for Los Angeles County. Los Angeles County Dept. of Public Health.
- Community Health Profiles. 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 Business Council, et al.
- San Mateo County All Together Better. San Mateo County Health.
- Spotlight on the Inland Empire. (2021). Measure of America. Lewis, K.
- Sustainable LA Environmental Report Card for Los Angeles County: Energy and Air Quality. (2017). UCLA: Sustainable LA Grand Challenge. Federico, F., 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
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- Air Data: Air Quality Data Collected at Outdoor Monitors Across the U.S. U.S. Environmental Protection Agency.
- Air Quality and Meteorological Information System. California Air Resources Board.
- AirNow: Home of the U.S. Air Quality Index
- America’s Children and the Environment. U.S. Environmental Protection Agency.
- 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. Centers for Disease Control and Prevention.
- Tracking California: Air Quality Data Query
- Upward Mobility Data Dashboard. Urban Institute.
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