A wide range of chemical compounds exist in the atmosphere, constantly interacting and transforming. The objective of this course is to understand chemical processes through which atmospheric constituents interact. The course covers the fundamental physical and chemical systems in the atmosphere, chemical reactions between atmospheric constituents, and the processes that form, transform, and remove pollutants. Topics include the structure and composition of the atmosphere, oxidation of emissions, aerosol chemistry, interactions between gases and particles,and human influence on atmospheric processes.