The Donora Smog that killed residents of a Pennsylvania town in 1948 was the first in a series of environmental disasters that led to today's environmental consciousness.
Cathy Milbourn, air quality spokeswoman for the U.S. Environmental Protection Agency, said the "fluoride fog" was one of the key events that prompted a cry for pollution control legislation.
"That supposedly triggered the first Clean Air Act," she said. "It's been said that if the smog lasted another day, it would have killed 1,000 instead of 20."
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