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Saturday, May 18, 2013
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7 U.S. cities with the worst air pollution
7 U.S. cities with the worst air pollution: St. Louis
7 U.S. cities with the worst air pollution
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St. Louis
St. Louis-St. Charles, Mo.-Farmington, Ill., tied with Cincinnati at #9 for year-round particle pollution, and this area also reported the lowest levels ever.
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