On April 14, 2003, pursuant to section 112 of the Clean Air Act (CAA), the EPA issued national emission standards to control hazardous air pollutants emitted from pushing, quenching, and battery stacks at new and existing coke oven batteries. This action amends the parametric operating limits and associated compliance provisions for capture systems used to control emissions from pushing. This action also amends the requirements for mobile scrubber cars that capture emissions which occur during pushing and travel.