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Smog Deaths In 1948 Led To Clean Air Laws

03:38
The mill town of Donora, Pa., seen Jan. 1, 1948. On Oct. 27 of that year, a smoky, lethal smog killed 20 people.  The air was polluted by local steel plants, railroad yards and zinc works. (Time & Life Pictures/Getty Images)
The mill town of Donora, Pa., seen Jan. 1, 1948. On Oct. 27 of that year, a smoky, lethal smog killed 20 people. The air was polluted by local steel plants, railroad yards and zinc works. (Time & Life Pictures/Getty Images)

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