The State of the Air 2012 report looks at levels of ozone and particle pollution found in monitoring sites across the United States in 2008, 2009, and 2010. The report uses the most current quality-assured nationwide data available for these analyses. The topics below will link you to more information.

FACT: Seventeen of the 25 cities with the worst annual particle pollution saw their lowest-ever levels, including Los Angeles, Pittsburgh and Cincinnati.

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