Major U.S. Air Pollution Episodes
of Historic Significance
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U.S. air quality degraded shortly after the
beginning of the industrial revolution
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Coal burning in Central and Midwest U.S
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1939 St. Louis Smog
Nov 28
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1948 Donora, PA
in the Monongahela River Valley
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20 deaths, 1000Õs took ill in 5 days Oct 27
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Prompted Air Pollution Control Act of 1955
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Ignored automobiles