Atmospheric Chemistry and Physics, 3rd Edition, as the previous two editions have done, provides a rigorous and comprehensive treatment of the chemistry and physics of the atmosphere - including the chemistry of the stratosphere and troposphere, aerosol physics and chemistry, atmospheric new particle formation, physical meteorology, cloud physics, global climate, statistical analysis of data, and mathematical chemical/transport models of the atmosphere. Each of these topics is covered in detail and in each area the central results are developed from first principles. In this way the reader will gain a significant understanding of the science underlying atmospheric processes and will be able to extend theories and results to solving real world problems.The 3rd edition includes completely new chapters on Atmospheric Organic Aerosols and Global Climate, as well as a significantly updated chapter on Physical Meteorology.  A new section on Positive Matrix Factorization is included that carefully develops this powerful statistical method for aerosol data analysis.Many chapters and topics have been updated and expanded from the Second Edition, including the Chemistry of Biogenic Hydrocarbons in the Troposphere, especially Isoprene Chemistry; Aqueous-Phase Organic Chemistry; mechanisms of Nucleation in the Atmosphere; Aerosol-Cloud relationships; and Chemistry of Mercury.  New problems have been added, especially ones at a basic level, to increase the utility of this text in classroom situations.