America's most polluted cities

Published On: Nov 04 2011 11:51:22 AM PDT   Updated On: Apr 20 2016 11:26:11 AM PDT

Just how dirty is the air you breathe? The American Lung Association has released its latest list of the most polluted U.S. cities.

most polluted cities - San Luis Obispo
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Leif Arne Storset/Wikimedia Commons

16. (tie) San Luis Obispo-Paso Robles-Arroyo Grande, California


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