An attempt has been made in this book to introduce scientific monitoring development of standards and their present position as well as different methods for pollution abatement. Basic knowledge about environmental chemistry and pollution is absolutely essential for any scientist or engineer anywhere in the world. Any research and development project or any technological innovation have to be planned and executed by scientists and engineers. Any such enterprise will have to get prior clearance from ministry of environment or other statutory environment protection agency before it can take off. Environmental audit has been made compulsory for all industrial establishments in our country and many other countries in the world. Thus it is obvious that basic principles regarding environmental chemistry and pollution control form an essential component of science and engineering curriculum at undergraduate and post-graduate levels. This book is expected to fill the gap of a much needed reference cum text book on environmental chemistry for students of B.Sc and M.Sc Environmental Chemistry and M Tech. (Environmental Engineering) and for the practising chemical engineer mechanical engineer civil and public health engineer industrial chemist and research students involved in manufacturing or research and development with an interest.