CONYERS, Ga. — More than 90,000 residents east of Atlanta were told to keep sheltering in place Monday a day after a chemical plant fire sent a massive plume of dark smoke high into the sky that could been seen for miles.

More than 90,000 residents east of Atlanta were told to keep sheltering in place Monday, a day after the chemical plant fire. The haze and chemical smell had spread to Atlanta by Monday morning, prompting firefighters to use detectors to check the air quality in various parts of the city, Mayor Andre Dickens said.

A shelter-in-place order remained in effect Monday in parts of greater Atlanta after a chemical fire at a pool cleaning facility shot plumes of black smoke into the air, forced evacuations and closed roads,