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Forbes: America's Dirtiest Cities

Pittsburgh-New Castle, PA

This old steel town is a new boom town for natural gas drilling, and downwind of coal-fired power plants in Ohio and West Virgina.
(iStock)

More From Forbes:
America’s Most Dangerous Cities
America’s Dirtiest Hotels
The Most Beautiful College Campuses



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

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