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.
Detours: cleaning up one of America’s most polluted cities
Additional footage from “Don’t Hold Your Breath” courtesy of Group Against Smog & Pollution (GASP).
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