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7 U.S. cities with the worst air pollution

Santa Fe, New Mexico

Photo: Maitri/Flickr

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Clean air cities

The report also listed the top 25 cleanest U.S. cities for year-round particle pollution. The top five were Cheyenne, Wyo.; Santa Fe-Espanola, N.M. (pictured); Honolulu; Anchorage, Alaska; and Great Falls, Mont.