Shocking images reveal how pollution plagued America's skies, rivers and highways before the Environmental Protection Agency (EPA) was founded in the 1970s.The agency commissioned the stark photos shortly after it formed to prove the US sorely needed its services, including the Clean Air and Water Acts.The gallery shows raw sewage flowed into the Potomac River near the , heavy smog engulfed 's George Washington Bridge and forests ravaged by droughts.
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