Number of people living in counties with air pollutant concentrations above the National Ambient Air Quality Standards (NAAQS) in the U.S. in 2023, by pollutant
(in millions)
Characteristic
Number of people in millions
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In 2023, almost *** million people in the United States lived in counties that were exposed to ozone concentrations above the levels determined by the National Ambient Air Quality Standards (NAAQS).Â
The NAAQS were established as part of the Clean Air Act and serve as limits on pollutant concentrations for outdoor air. The pollutants covered by the NAAQS include ozone, particulate matter, lead, carbon monoxide, sulfur oxides, and nitrogen oxides.
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Environmental Protection Agency. (January 8, 2025). Number of people living in counties with air pollutant concentrations above the National Ambient Air Quality Standards (NAAQS) in the U.S. in 2023, by pollutant (in millions) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 27, 2026, from /statistics/1360221/us-exposure-to-pollutant-concentrations-above-naaqs/
Environmental Protection Agency. "Number of people living in counties with air pollutant concentrations above the National Ambient Air Quality Standards (NAAQS) in the U.S. in 2023, by pollutant (in millions)." Chart. January 8, 2025. ÌÇÐÄÆƽâ°æ. Accessed July 27, 2026. /statistics/1360221/us-exposure-to-pollutant-concentrations-above-naaqs/
Environmental Protection Agency. (2025). Number of people living in counties with air pollutant concentrations above the National Ambient Air Quality Standards (NAAQS) in the U.S. in 2023, by pollutant (in millions). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 27, 2026. /statistics/1360221/us-exposure-to-pollutant-concentrations-above-naaqs/
Environmental Protection Agency. "Number of People Living in Counties with Air Pollutant Concentrations above The National Ambient Air Quality Standards (Naaqs) in The U.S. in 2023, by Pollutant (in Millions)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 8 Jan 2025, /statistics/1360221/us-exposure-to-pollutant-concentrations-above-naaqs/
Environmental Protection Agency, Number of people living in counties with air pollutant concentrations above the National Ambient Air Quality Standards (NAAQS) in the U.S. in 2023, by pollutant (in millions) ÌÇÐÄÆƽâ°æ, /statistics/1360221/us-exposure-to-pollutant-concentrations-above-naaqs/ (last visited July 27, 2026)
Number of people living in counties with air pollutant concentrations above the National Ambient Air Quality Standards (NAAQS) in the U.S. in 2023, by pollutant (in millions) [Graph], Environmental Protection Agency, January 8, 2025. [Online]. Available: /statistics/1360221/us-exposure-to-pollutant-concentrations-above-naaqs/
