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, including a main traffic vein into the city.

A massive chemical fire at a BioLab plant in Conyers, Georgia, ignited chaos across the region, sending over 90,000 residents into emergency shelters and spreading a thick haze of dangerous smoke and chemical odor as far as Atlanta.

Some residents east of Atlanta were evacuated while others were told to shelter in place Sunday to avoid contaminants from a chemical plant fire that sent a massive plume of dark smoke high into the sky that could be seen from miles away.

Parts of Atlanta were covered by a haze and the smell of chlorine on Monday, and residents are concerned about the health risk of exposure to chemicals. Here's what some experts say.

Public health officials insist the air, fouled by burning “chlorines, chloramine and chlorine compounds” from a chemical plant, is safe to breathe but they have released few details.