Source: https://www.inquirer.com/health/chester-pq-corporation-pollution-dep-fine-20190730.html The Pennsylvania Department of Environmental Protection has fined PQ Corp., a global manufacturer of materials and chemicals, $750,000 for air quality and other violations at a large Chester facility it operates. PQ, based in Malvern, owns a 173,000-square-foot plant on West Front Street, where the DEP says emissions exceeded allowances for nitrogen oxides and…