The present book entitled "Environmental Science" has been designed for B.Sc./B. Tech./BBA/MBA and M.Sc. students. With the increasing environmental consciousness and concern about our surroundings, this subject has been incorporated in the course curriculum in most of the developed and developing countries. Thus this book is written to bring about an awareness of a variety of environmental concern those arises due to the over exploitation of our natural resources causing environmental pollution. The language is simple and incorporated figures for easy understanding of the subject matters. This book consists of seven chapters and authors are hopeful that the book will provide a complete package of environmental science.