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America's most polluted cities

Published On: Nov 04 2011 01:51:22 PM CDT   Updated On: Apr 24 2013 11:04:34 AM CDT

Just how dirty is the air you breathe? The American Lung Association rates the most polluted cities in the U.S.

Cleanest - Lousville
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12. (tie) Louisville-Jefferson County-Elizabethtown-Scottsburg, Ky.-Ind.

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