The Donora Pennsylvania Smog
In late October 1948, a noxious smog enveloped the Monongahela River Valley town of Donora, Pennsylvania. In the 5 days October 26 to 31, 20 people died. Within 1 month, about 70 had lost their lives and the town funeral parlor ran out of caskets. And some, like Devra Davis’ grandmother, were debilitated for the rest of their lives.
At the turn of the 20th century, the Donora Mill attracted people because “Smoke meant jobs,” according to Dr. Davis who tells the story of Donora’s Killer Smog in her book When Smoke Ran Like Water. This work was the first book on the environment since Rachel Carson’s Silent Spring to become a National Book Award Finalist in non-fiction and has now been translated into more than a dozen languages.
The cause of the Donora smog proved to be a deadly mixture of emissions from the plants and coal furnaces located in the valley and town. Sulfur dioxide, carbon monoxide and metal dust—a possibly highly reactive fluoride gas—were trapped in the town by a layer of stable cool air that kept warmer polluted fumes from escaping. Years later, views over the valley showed large patches of land on which no vegetation would grow. The investigation into the Donora Smog Disaster was essential to the first federal clean-air act, passed in 1955.
- From December 1952 to March 1953 in Greater London 12,000 residents more than usual perished in what was modern London’s most massive civilian disaster. Smoke from a million chimneys ran like water and pumped clotted, coal-fumes into cooler stilled air.
- “The Donora smog gained national attention and helped lead to some of the first local and state pollution control laws, and, eventually, the 1970 federal Clean Air Act.” Read the article
Scott Beveridge: Devra Davis talks smog in Donora
- “‘Donoras are happening today in small areas of India and China,” Dr. Davis said. “Why is Donora so important? We must warn those living in similar conditions today.”
Dr. Davis discusses lessons learned from 2014 West Virginia Water Pollution Disaster
John Hopkins Magazine: Cutting Through the Smoke
A Cloud With a Silver Lining: The Killer Smog in Donora, 1948 By Erin Peterman, Spring 2009
There never was such a fog: By David Noon