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5. Modesto, Calif.

Modesto is another polluted city in California's Central Valley. Its 500,000 people have a 15.5% unemployment rate, rank 5th in short-term particle pollution and 11th in ozone.

Sperling Air Quality Index: 6
Sperling Water Quality Index: 34

(Marty Bicek/ZUMA Press/Newscom)

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The opinions expressed are solely those of the author and do not necessarily reflect the views of Comcast.

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