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Hell with the Lid Taken Off

Image of Air Pollution in Pittsburgh
Publication Date: 
Tuesday, September 2, 2014

During the first half of the twentieth century, coal burning at power plants, factories, and homes filled the air over the Midwestern U.S. with pollution. “Smoke”—as air pollution was usually called—used to occasionally block so much sunlight that people were forced to carry lamps in the middle of the day.