The object of this course is to provide a rigorous, comprehensive treatment of the chemistry and physics of the atmosphere, including the formation, growth, dynamics, and properties of gaseous pollutants and aerosols, the meteorology of air pollution, the transport, diffusion, and removal of species in the atmosphere, the formation and chemistry of clouds, the interaction of atmospheric chemistry and climate, the radiative and climatic effects of gases and particles, and the formulation of mathematical chemical/transport models of the atmosphere. In each area the central results are developed from first principles. In this way, the student will gain a significant understanding of the science underlying the description of atmospheric processes and will be able to extend theories and results beyond those for which we have space here.