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information and common input parameters and assumptions for airport applications.
EDMS 4.0 and it’s subsequent updates contains EPA’s latest, and most preferred, atmospheric
dispersion model – AERMOD. Unlike previous dispersion models, AERMOD significantly increases
the fidelity of modeling concentrations by using both surface and upper-air observations to more
accurately characterize the atmosphere. This allows for the mixing height and stability to be
calculated continuously, as well as to provide a vert cal profile for many atmospheric parameters.
addition, AERMOD allows irregularly shaped area sources as well as point and volume sources to
be modeled. EDMS uses a combination of all these source types for modeling airport sources. This
represents a significant advancement to EDMS and the analyst should refer to the following
publication for additional information and guidance on the application of this model:
Emissions & Dispersion Modeling System Reference Manual, prepared for the FAA,
prepared by CSSI Inc. May 2001 (or the latest version).
User’s Guide for the AMS/EPA Regulatory Model
Office of Air Quality Planning and Standards, November 1998.
When evaluating the modeling results to determine f a violation of the NAAQS is/are expected to
occur, consideration must be given to the appropriate averaging time(s) and number of exceedances
for the pollutant for which standards exist. EPA has identified a limited number of exceedances
before a violation occurs for each pollutant. In most cases, each receptor in the modeling network is
treated individually and any exceedance above the number allowed of a NAAQS at any receptor is
considered a violation.
Equation I-1, in the handbook, on page I-6, defines Q as the mass flow of contaminants “from
receptor”, should read “from source”.
EDMS does not use point “puffs” as described in paragraph 2 on Page I-8 to represent the takeoff
roll and initial climb (and approach and landing). Instead, EDMS uses a series of area sources that
represent “wide lines” for those modes.
In EDMS 4.0 and later, dispersion emissions are calculated for airplanes on takeoff, during their
climb at takeoff power up to 1000 feet above the surface, during approach from 1000 ft. above the
surface and during the landing roll. Dispersion emissions for helicopters are only modeled for a
hover taxi mode.
For additional information and guidance on meteorology data, see Sec. 4.2.2 Meteorology
For additional information and guidance on receptors, see Sec. 4.2.4 Receptors
For additiona information and guidance on aircraft emission sources, see Appendix D: Aircraft
Emission Methodology, above.
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AIR QUALITY PROCEDURES FOR CIVILIAN AIRPORTS & AIR FORCE BASES
(THE "AIR QUALITY HANDBOOK")
ADDENDUM (Continued)
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Appendix J: State Indirect Source Review Regulations (p. J-1)
Provides a list of states the ISR requirements and their thresholds.
The list of states that have the ISR (or Transportation Facility Permit) changes regularly and so the
requirement for this assessment should be checked with each state on a case-by-case basis.
Attachment 1: JP Airline-Fleets International 94/95 Example Page
Provides an example summary page of airline fleet m x information.
Complete sets of JP airline fleets data for more recent years can be purchased in electronic and/or
hard format on the following web site:
http://www.buchair.com/JPAF.htm
Attachment 2: ICAO Engine Exhaust Emissions Databank Example Engine Data
Provides an example one-page summary of aircraft engine emission factors.
ectronic version of this material can be found on the following web site:
http://www.qinetiq.com/aircraft.html
Attachment 3: "Aviation Week & Space Technology" U.S. Commerc
Provides an example one page summary of aircraft / aircraft engine combinations.
An up-to-date listing of aircraft / aircraft engine comb nations can be found in the following
publications or on the following web site:
North American Airlines Handbook, Second Edition, Airways International Inc., 1999.
International Directory of Civil Aircraft 2001/2002, Aerospace Publications Ltd. 2001
http://www.speednews.com/lists/lists.shtml (SpeedNews is a source for news and
information for the commercial and military aviation industries.
http://www.backaviation.com/
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AIR QUALITY PROCEDURES FOR CIVILIAN AIRPORTS & AIR FORCE BASES
(THE "AIR QUALITY HANDBOOK")
　
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