This course will cover concepts, mechanisms, and some of the latest progresses in atmospheric chemistry. It starts with fundamentals of atmospheric chemistry. Basic ideas in atmospheric physics, including models and transport, geophysical cycles, and greenhouse effects, will be presented to assist a full and better understanding of atmospheric chemistry. The main body of this course will cover chemical kinetics, stratospheric chemistry, tropospheric chemistry, aerosol physics and chemistry, and air pollution and acid rain. In a special circumstance, a selected aspect of atmospheric chemistry with latest progresses will be discussed.