The state of California had the worst air quality in the United States from 2020 to 2023, with average fine particulate matter (PM2.5) concentrations of **** micrograms per cubic meter (µg/m³). This was roughly times higher than the average PM2.5 concentration in Hawaii, the U.S. state with the cleanest air. Some of the factors affecting air pollution in California include vehicle emissions, industrial processes, and wildfires.
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America's Health Rankings. (December 2, 2024). Average fine particulate matter (PM2.5) pollution levels in the United States from 2020 to 2023, by state (in micrograms per cubic meter) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 28, 2026, from /statistics/1447785/united-states-pm25-air-pollution-exposure-by-state/
America's Health Rankings. "Average fine particulate matter (PM2.5) pollution levels in the United States from 2020 to 2023, by state (in micrograms per cubic meter)." Chart. December 2, 2024. ÌÇÐÄÆƽâ°æ. Accessed July 28, 2026. /statistics/1447785/united-states-pm25-air-pollution-exposure-by-state/
America's Health Rankings. (2024). Average fine particulate matter (PM2.5) pollution levels in the United States from 2020 to 2023, by state (in micrograms per cubic meter). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 28, 2026. /statistics/1447785/united-states-pm25-air-pollution-exposure-by-state/
America's Health Rankings. "Average Fine Particulate Matter (Pm2.5) Pollution Levels in The United States from 2020 to 2023, by State (in Micrograms per Cubic Meter)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 2 Dec 2024, /statistics/1447785/united-states-pm25-air-pollution-exposure-by-state/
America's Health Rankings, Average fine particulate matter (PM2.5) pollution levels in the United States from 2020 to 2023, by state (in micrograms per cubic meter) ÌÇÐÄÆƽâ°æ, /statistics/1447785/united-states-pm25-air-pollution-exposure-by-state/ (last visited July 28, 2026)
Average fine particulate matter (PM2.5) pollution levels in the United States from 2020 to 2023, by state (in micrograms per cubic meter) [Graph], America's Health Rankings, December 2, 2024. [Online]. Available: /statistics/1447785/united-states-pm25-air-pollution-exposure-by-state/
