•The Clean Air
Act imposes requirements on States that have not achieved EPA air quality standards.
states” must establish a permit program regulating new or modified major stationary sources of
regulations promulgated under the Reagan Administration allow a State to adopt a definition of "stationary source" under which a plant with
devices may install or modify one piece of equipment without meeting the permit conditions if
the alteration will not
increase the total plant emissions.
regulations allowed a State to treat all of the pollution-emitting devices within the same industrial grouping as though they were encased within a single “bubble.”