This book examines select types of considerations in the federal control of air emissions. Topics discussed in this compilation include controlling air emissions from outer continental shelf sources; the EPA's Boiler MACT standards to control emissions of hazardous air pollutants; tall smokestacks and their contribution to interstate transport of air pollution; the revisions and associated issues relating to the National Ambient Air Quality Standards for Particulate Matter; and a summary of the Clean Air Act and its major requirements.