This is an advanced topics seminar course on atmospheric chemistry. We will cover different topics each week, including kinetics, cloud activation, experimental methods, partitioning, deposition, and meteorology. Through lectures, assigned readings and student-led discussions, this course will address several issues of current concern in atmospheric chemistry. The specific topics will vary by year and instructor, but could include heterogeneous chemistry, unimolecular and 3-body reactions, particle formation and growth, chemistry-climate interactions and inclusion of chemistry in atmospheric dynamical models.