Report Cards

The American Lung Association State of the Air report issues an annual report card for all cities and counties where air quality data is collected on ozone and particle pollution.
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The American Lung Association "State of the Air 2025" report ranks cities and grades counties based on their levels of ozone and two measures of particle pollution in 2021, 2022 and 2023. We use official data from the U.S. Environmental Protection Agency (EPA) to compile the results. For more information about how we rank and grade cities and counties, go to Methodology.

Cleanest Cities

See the cleanest cities and learn more about how your city ranks.

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Most Polluted Cities

See the 25 most polluted cities and counties for ozone and particle pollution ranked.

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States and Counties

Get the report card for your state's air quality, and the number of people in groups at risk.

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Compare Your Air

Find out how your city measures up when it comes to air pollution.

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