City RankingsThe American Lung Association State of the Air report ranks the metropolitan areas based on ozone and particle pollution.
The cities on the cleanest cities lists for ozone and for short-term levels of particle pollution had no days with unhealthy levels of ozone or particle pollution.
Most Polluted Cities
The cities are ranked by the air quality in the most polluted county in the metropolitan area.
Get the report card for your state's air quality, including high ozone days, particle pollution and groups at risk.
Compare Your Air
Find out how your city measures up when it comes to air pollution.