The document summarizes the accomplishments of the EPA Center for Airborne Organics; including summaries of research projects, symposia, and the development of the center itself. The central concern of the research was the production of organic air pollutants and their effects. Topics include the chemistry of airborne organics, engine production of organics, fuel additives, particulates, soot, aromatic hydrocarbons, aerosols, transport and transformation of air pollutants, monitoring and source attribution, and regulation. This is the final report of a cross-institute collaboration of the Massachusetts Institute of Technology, California Institute of Technology, and the New Jersey Institute of Technology.