All pollution is taught at length in environmental science, engineering, life sciences, and social science courses. The syllabi of these courses are as vast and varied as the dimentions of this global problem and consequently there is ever increasing need of information on sources, effects and control of air pollution. The present book is an attempt in this direction and has been particularly written to fill up the visible gaps in the information required by various users in India. Having taught this subject for over two and a half decades, the authors were constantly conscious of a comprehensive book in this field.