The environmental studies of pollution in the Mexico City Air Basin serve as models for urban areas all over the world. This book reviews the ongoing research for the first time and synthesizes a complete study of the effects of air pollution on forests. A thorough discussion of regional geology, climate and hydrology and the sociological factors affecting air pollution in the area sets the stage for a variety of case studies of forests. The editors also address the outlook for the health and sustainability of forests in the midst of widespread urbanization.