Pollution from Ohio train derailment reached 110 million Americans ( grist.org )

On February 3, 2023, a freight train owned by Norfolk Southern carrying thousands of gallons of toxic chemicals derailed in the town of East Palestine, Ohio.. For days, flames engulfed the rail cars, which contained highly hazardous materials, including vinyl chloride and butyl acrylate, used in the production of plastic. A thick, tall plume of black smoke billowed from the accident site and forced the evacuation of thousands of residents. Now, scientists say that traces of this pollution was found across 16 states, spanning 540,000 square miles from Wisconsin to Maine to South Carolina.

When [David] Gay [National Atmospheric Deposition Program at the University of Wisconsin-Madison] and his colleagues began their research, they expected pollution in western New York, Pennsylvania, and Ohio. The reality, he said, was much more extensive. A low pressure system helped push pollution over parts of Michigan and Wisconsin. Pollution likely made its way into all the Great Lakes, except Lake Superior, he noted.