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Forbes: America's Dirtiest Cities

Birmingham-Hoover-Cullman, AL

Pollution levels have improved a lot, but Birmingham suffers from being located in a valley that tends to trap stagnant summer air. Two interstate highways don't help either.

(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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