The Fresno-Madera metro area takes the prize for dirtiest city in America. The 500,000 people in this area suffer from being exposed to groundwater polluted by agriculture as well as having the 5th worst year-round particle pollution in the nation, according to the American Lung Association. Sperling Air Quality Index:
1 Sperling Water Quality Index:
(AP Photo/Gary Kazanjian) More from Forbes
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