America's Top 10 Most Polluted Cities
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April 6, 2013

FREDERIC J. BROWN/AFP/Getty Images

Dirty Statistics

More than 4 in 10 Americans "live in counties that have unhealthful levels of either ozone or particle pollution," according to the latest State of the Air project from the American Lung Association. 

Another disturbing find is that many of the ten most-polluted cities on the list are concentrated in two regions of the country: California and the Ohio Valley. 

Let's head to Southern California first. (#1 City Is...)

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