Providing an efficient overview of the Clean Air Act and its implementing regulations, this handy guide covers all essential areas of the statute as well as important recent developments such as the Massachusetts v. EPA decision. Topics include: the National Ambient Air Quality Standards; processes applicable to new, modified, and reconstructed stationary sources; air toxics program requirements; greenhouse gas (GHG) emissions; the acid rain and Title V operating permit programs; and mobile source air pollution control requirements.