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The Emissions and Dispersion Modeling System (EDMS) was developed in the mid-l980s as a complex source microcomputer model to assess the air quality impacts of proposed airport development project In response to the growing needs of the air quality analysis community and changes in regulations (Conformity requirements from the Clean Air Act Amendment of 1990) the Federal Aviation Administration (FAA) in cooperation with the United States Air Force (USAF) has re-engineered and enhanced EDMS. EDMS Version 3.0 was built under the guidance of a government and industry advisory board composed of experts from the scientific, environmental policy, and analysis fields. It features the latest aircraft engine emission factors from the International Civil Aviation Organization (ICAO) Engine Exhaust Emissions Data Bank, vehicle emission factors from the Environmental Protection Agency's (EPA) MOBlLE5a, EPA-validated dispersion models, and improved performance. The analyst can more effectively determine emission levels and concentrations generated by the typical airport/air base sources (i.e. aircraft, ground support equipment) as well as the airport/air base associated emissions contributors such as motor vehicles and power plants. This Reference Manual is intended to provide detailed information on the functionality of the model and acts as an extension and elaboration of the on-line help. The section on References provides an extensive listing of documents that may be of further assistance to the analyst in the use of EDMS and the preparation of an Environmental Impact Statement (ElS).