On the evening of Feb. 22, 2020, Satartia, a small town in Yazoo County, Mississippi, was enveloped in a fog of fetid gas following a loud boom. People collapsed, shaking and breathless, vehicles choked to a halt, and first responders were bewildered. It took four hours to bring the situation under control. Two hundred people were evacuated to safety; 49 had to be hospitalized. Three years later, respiratory problems still plague many residents.
