ATLANTA - Air quality monitors near the BioLab facility detected elevated chlorine levels overnight, exceeding safety thresholds, according to Georgia Emergency Management and Homeland Security Agency.

The chemical fire sent chlorine into the air, forcing schools to close and sending tens of thousands of residents indoors

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.

Crews have been working to remove much of the products from the BioLab factory since putting out the fire that sparked early Sunday morning.