August 19, 2019 Marietta: Cobb Commissioner Bob Ott speaks with Stop Sterigenics Georgia volunteer Barry Goppman as Cobb officials and environmental regulators hold a town hall and community forum in the wake of reports that Cobb and Fulton have high levels of carcinogenic gas on Monday, August 19, 2019, in Marietta. A user and emitter of the gas, Sterigenics, which sterilizes medical equipment, operates in the area. Curtis Compton/ccompton@ajc.com