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.