Subsidiaries of Westlake Chemical Corporation have agreed to reduce harmful air pollution at three chemical plants in the United States

Westlake Chemical Corporation's five subsidiaries — Westlake Chemical OpCo LP, Westlake Petrochemicals LLC, Westlake Polymers LLC, Westlake Styrene LLC, and Westlake Vinyls, Inc. — have agreed to spend $110 million on upgrades and compliance measures to resolve allegations that they violated the Clean Air Act and state air pollution control laws at two of their petrochemical manufacturing facilities in Lake Charles, Louisiana, ....