As a plume of smoke from a fire at a Conyers chemical plant hangs over metro Atlanta, so do questions about what exactly is burning and the extent of any public health risk.
The fire started Sunday at the BioLab factory , which manufactures chemicals used in pools and spas. The fire was still smoldering Tuesday, with smoke expected to linger all week.
The blaze prompted evacuation orders for about 17,000 people near the plant, shelter-in-place orders for thousands more and the closing of Interstate 20. Rockdale County Public Schools were closed for fall break, but Newton County Schools closed Monday and Tuesday. Other districts canceled outdoor after-school activities…