Environmental chemistry refers to the natural chemical and biochemical processes occurring in the nature. It concerns with the evaluation and analysis of the effects, reactions, sources, fates, etc. of chemical products present in the air, water, and soil. The methods used in this field are quantitative chemical analysis, atomic and mass spectrometry, etc. The topics covered in this textbook offer the reader new insights in the field of environmental chemistry. It aims to serve as a resource guide for students and experts alike and contribute to the growth of the discipline.