Donora Zinc Works

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October, 1948

An atmospheric inversion in Donora held the town under a cloud of gas from the Donora Zinc Works. Twenty people died. Public outcry over the incident forced the federal government to begin studying air pollution, it’s causes, effects, and how to control it. This led to the Air Pollution Control Act of 1955, the ancestor of the Clear Air Act of 1970.

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