A chemical plant fire that ignited Sunday has left more than 90,000 residents of a Georgia county sheltering in place. The big picture: Air quality surveys detected chlorine, a harmful irritant, in the air emitting from the Conyers, Georgia, BioLab facility, prompting business and road closures across Rockdale County, an area east of Atlanta.

A reaction following a fire at a Georgia chemical plant Sunday morning forced evacuations, shelter-in-place advisories and road closures in the area, according to Rockdale County officials.

A massive explosion at a chemical plant in Georgia caused a huge plume of smoke, and authorities have instructed residents and businesses to shelter in place.