The 1948 Donora smog, also called the Donora death fog, was an air pollution disaster that occurred in Donora, Pennsylvania, beginning on October 27, 1948, and lasting several days. It was caused by hydrogen fluoride and sulfur dioxide emissions from U.S. Steel's Donora Zinc Works and its American Steel & Wire plant during an atmospheric temperature inversion.
The 1948 Donora smog, also called the Donora death fog, was an air pollution disaster that occurred in Donora, Pennsylvania, beginning on October 27, 1948, and lasting several days. It was caused by hydrogen fluoride and sulfur dioxide emissions from U.S. Steel's Donora Zinc Works and its American Steel & Wire plant during an atmospheric temperature inversion.
Source: Wikipedia "1948 Donora smog" · CC BY-SA 4.0
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