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Forbes.com: America's Dirtiest Cities

10. Milwaukee, Wi.

Decades of heavy industrial development along the Milwaukee River has contributed to significant amounts of PCBs and heavy metals polluting groundwater and draining towards Lake Michigan. The 1.5 million residents of the Milwaukee-Waukesha metro endure air that's ranked 20th for short-term particle pollution.

Sperling Air Quality Index: 26
Sperling Water Quality Index: 26

(AP Photo/Roger Schneider)

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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