According to the Donora, Pennsylvania Historical Society and Smog Museum’s web site: “As the week of October 24, 1948 began, the nearly 14,000 people of Donora paid little attention to the dense heavy fog covering the town. The cool to cold autumn nights combined with warm water from the Monongahela river and smoke from the local steel mill, namely the Zinc Works blast furnace and open hearth, as well as thousands of coal furnaces in local homes, would typically limit visibility until afternoon. As the week wore on, residents began to realize this fog was anything but typical. By Thursday, October 28, streetlights were on during mid-day and people walking the streets were struggling to find their way. Soon, many elderly people began to complain of breathing difficulty, thousands were ill, and houseplants began to shrivel. Then, on October 30 1948, people began to die. Donora physicians worked around the clock, treating victims as best they could against a mysterious pathogen. The Donora Board of Health set up an emergency aid station and temporary morgue in the basement of the Community Center. Volunteer firemen felt their way door to door, administering oxygen and attempting to get people help. Management at the mill refused to believe or admit that the waste they were emitting caused the problem; after all, it was the same thing they had been doing for over thirty years. In less than three days, thousands of people were impacted, hundreds of people fell sick, twenty-six people were dead, along with dozens of animals. Who knows how many more followed in the weeks, months and years to come that are not counted among the twenty-six. On October 31, rains finally dispersed the killer fog, but left the nation in shock. The dead and sick were not only from Donora but also from the neighboring communities of Webster and Sunnyside that were down wind and across the river. The Federal, State and Local governments, along with numerous universities and scientists, investigated. Sulfur dioxide emissions from U.S. Steel's Donora Zinc Works and its American Steel & Wire plant were frequent occurrences in Donora. What made the 1948 event more severe was a temperature inversion, in which a mass of warm, stagnant air was trapped in the valley. The pollutants in the air mixed with fog to form a thick, yellowish, acrid smog that inhibited the normal process where the sun would burn off the fog. This smog hung over Donora for five days. The sulfuric acid, nitrogen dioxide, fluorine and other poisonous gases that usually dispersed into the atmosphere were caught in the inversion and continued to accumulate until rain ended the weather pattern.. The best way to sum up the event is a quote by W. Michael McCabe "Before there was an Environmental Protection Agency, before there was an Earth Day before Rachel Carson wrote Silent Spring, there was Donora."
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