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 Francisco
7 / 22
CNN/Jake Carpenter

6. (tie) San Jose-San Francisco-Oakland, California


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