A new Georgia Tech study found the chemical plume from the 2024 BioLab fire in Conyers, Ga., released bromine, not chlorine, as its dominant compound in the immediate aftermath. This finding stands in stark contrast to early public warnings about the fire, which prompted 17,000 evacuations, closed portions of I-20, and led to overnight shelter-in-place orders for weeks. Nearly two years later, the U.S. Chemical Safety Board is still investigating the fire and chemical release. 

The Georgia Tech paper containing the study was published in the March 2026 issue of Environmental Science & Technology Letters and identified 26 different chemical species in the air following the Sept. 29, 2024, fire at the BioLab facility in Conyers. The authors wrote that the chemically complex plume "exposed millions in metropolitan Atlanta to numerous toxic compounds" and represented the first detailed study of a pool chemical facility fire.