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7 U.S. cities with the worst air pollution

Aug. 4, 2010, 12:20 p.m.
Bakersfield, California

Photo: djbones/Flickr

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Bakersfield, Calif.

Bakersfield, Calif., had higher levels of year-round particle pollution compared to the 2009 report. It ranked #2.

Nearby cities that also made the top 10 in year-round particle pollution were Visalia (#3), Fresno (#6) and Hanford (#8). Like Bakersfield, Visalia and Fresno worsened; Hanford improved.