The study of the biochemical and chemical phenomena that occur in natural places falls under the domain of environmental chemistry. It studies the sources, reactions, effects and transport of chemical species in diverse environments such as soil, air and water. It involves a better understanding of how the uncontaminated environment works. It also includes the study of chemicals in concentrations that are present naturally. It is an interdisciplinary field of science, which includes various branches of chemistry such as aquatic, soil and atmospheric chemistry. It also uses principles from analytical chemistry. Environmental chemistry observes the chemical processes occurring in the environment that are affected by human activities and causes various environmental changes. This textbook presents the complex subject of environmental chemistry in the most comprehensible and easy to understand language. Some of the diverse topics covered in this textbook address the varied branches that fall under this category. Those in search of information to further their knowledge will be greatly assisted by this book.