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7 U.S. cities with the worst air pollution

By: chief on Aug. 4, 2010, 12:20 p.m.
Los Angeles skyline

Photo: ZUMA Press

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Los Angeles

Alas, no report on dirty air would be complete without L.A. Los Angeles-Long Beach-Riverside, Calif., ranked #3 in long-term particle pollution, #1 in ozone pollution and #4 in short-term particle pollution.

Although Los Angeles had slightly worse ozone average levels than in the 2009 report, the metro area still reported its second lowest ozone levels since the lung association’s first report was released in 2000.