The American Lung Association "State of the Air 2016" report ranks the metropolitan areas based on ozone andparticle pollution during 2012, 2013 and 2014. For particle pollution, we rank separately the areas with high year-round (annual average) levels and high short-term levels (24-hour) found in monitoring sites across the United States. We take official data from the U.S. Environmental Protection Agency (EPA) to compile the rankings. For more information about how we grade and rank cities, go to Methodology.
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