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Forbes.com: America's Dirtiest Cities

3 of 12

9. Stockton, Calif.

Stockton summer heat exacerbates ozone levels that rank 23rd in the nation. Population is 650,000. The city has little means to fund environmental initiatives. It has sought to avert bankruptcy by laying off city employees, including a quarter of its police force.

Sperling Air Quality Index: 15
Sperling Water Quality Index: 35

(David Paul Morris/Bloomberg via Getty Images)

More from Forbes:
Cities Where Home Prices Are Still Tumbling
The Easiest And Hardest Cities For Finding A Job
Where Americans Are Moving



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

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