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Detours: cleaning up one of America's most polluted cities

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Steel helped transform Pittsburgh into a powerhouse in the 20th century, but once the industry collapsed, it left behind a city forever changed. The dense soot cloud that hovered overhead for decades is finally breaking up, but some of the nation's worst levels of air pollution still remain.

Additional footage from "Don't Hold Your Breath" courtesy of Group Against Smog & Pollution (GASP).