This text covers the whole air pollution field, from an engineering perspective. The principal topics are control devices and their theory. The book uses many more examples than other texts to help the student see the magnitudes of important quantities and to show and practice the practical application of theoretical treatments presented. The other half is devoted to topics that form some of the background for the selection of such devices, i.e., air pollution effects, the structure of U.S. air pollution law, atmospheric models, etc.