Tina Simmons, the head inspector, is dressed for a “Class 10 Clean Room ” with yellow filters over the lighting in the room at the PPG Plant Friday, Nov. 3, 2017, in Monroeville. (Darrell Sapp/Post-Gazette)
PPG Materials at Monroeville
Tina Simmons, the head inspector, is dressed for a “Class 10 Clean Room ” with yellow filters over the lighting in the room at the PPG Plant Friday, Nov. 3, 2017, in Monroeville. (Darrell Sapp/Post-Gazette)