Since September 29, when the smell of chlorine first began to waft over metro Atlanta, Georgia residents’ lives have been upended by an enormous chemical fire. That day, a chemical plant containing millions of pounds of pool sanitizer burned to the ground in Conyers, Georgia. The blaze was extinguished in hours, but an enormous plume of orange and black smoke remained for days, so thick that drivers on Interstate 20 struggled to see past their windshield. Authorities ordered 17,000 people to evacuate and more than 90,000 to shelter in place…