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4.1The Emissions and Dispersion Modeling System (EDMS) was developed in the mid-1980s as a complex source microcomputer model designed to assess the local air quality impact of proposed airport development projects. In response to the growing needs of the local air quality analysis community and changes in regulations (e.g., Conformity requirements from the Clean Air Act Amendments of 1990) the FAA, in cooperation with the United States Air Force (USAF), re-engineered and enhanced EDMS as Version 3 in 1997. EDMS Version 3 was re-engineered under the guidance of a government/industry advisory board composed of experts from the scientific, environmental policy, and analysis fields.
EDMS is designed to assess the local air quality impact of airport emission sources, particularly aviation sources, which consist of aircraft, auxiliary power units, and ground support equipment. EDMS also offers a limited capability to model other airport emission sources that are not aviation-specific, such as power plants, fuel storage tanks, and ground access vehicles. EDMS 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) MOBILE5a, and EPA-validated dispersion algorithms. Since 1993, EDMS has been an EPA "Preferred Guideline" model for use in civil airports and military air bases. In 1998, the FAA revised its policy on local air quality modeling procedures for aviation sources, to ensure consistency and quality in performing aviation air quality analyses. The revised policy identified EDMS as the required (i.e., instead of preferred) model to perform local air quality analyses for aviation sources. The FAA continues to enhance the model under the guidance of its government/industry advisory board, to more effectively determine emission levels and concentrations generated by typical airport/air base emission sources.
FAA POC:
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NASA Headquarters Responsible Official: Code R
Curator: SAIC Information Services http://www.aerospace.nasa.gov |
