The Emissions and Dispersion Modeling System (EDMS) was developed in the mid-1980s as a complex source microcomputer model designed to assess the air quality impacts of proposed airport development projects.

What is EDMS Designed to Do?

The Emissions and Dispersion Modeling System (EDMS) is designed to assess the air quality impacts of airport emission sources, particularly aviation sources, which consist of:

  • Aircraft
  • Auxiliary power units
  • Ground support equipment
  • Ground access vehicles
  • Stationary sources

EDMS is one of the few air quality assessment tools specifically engineered for the aviation community. It includes:

  • Emissions and dispersion calculations
  • The latest aircraft engine emission factors from the International Civil Aviation Organization (ICAO) Engine Exhaust Emissions Data Bank
  • Vehicle emission factors from the latest version of the Environmental Protection Agency's (EPA) MOBILE6 model
  • EPA-validated dispersion algorithms
  • Emissions data for criteria pollutants and speciated organic gas emissions OGs (45 HAPs and 349 non-toxic compounds).

FAA Required Model

In 1998, FAA revised its policy on air quality modeling procedures to identify EDMS as the Required Model (PDF) to perform air quality analyses for aviation sources instead of the preferred model. This revised policy ensures the consistency and quality of aviation analyses performed for FAA. 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 emission sources.

EDMS 5.1.4.1 (August 2013)

EDMS 5.1.4.1 contains bug fixes and improvements over EDMS version 5.0 through EDMS version 5.1.4 which represents a significant improvement in capabilities and functionality over the EDMS 4.x series. Here is a short list of the major improvements made in EDMS 5.1.4.1.

Best Practice Document for Using EDMS with USEPA MOVES

The FAA has produced a best practice document for using EDMS with the U.S. Environmental Protection Agency's (USEPA) Motor Vehicle Emission Simulator (MOVES) model, which has replaced USEPA's MOBILE model. It is available for download in PDF format.

  • The Usage of the U.S. Environmental Protection Agency's (USEPA) Motor Vehicle Emission Simulator (MOVES) with the Federal Aviation Administration's (FAA) Emissions and Dispersion Modeling System (EDMS): 600 KB PDF file (PDF), last updated February 28, 2014.

Study & Overall Modeling Improvements

  • Updated to the latest version of AERMOD (v12345), AERMET (v12345) and AERMAP (v11103). Based on some preliminary test runs, ambient concentration results are not impacted significantly from the previous version.
  • Updated the Airport Emissions Reduction Credit (AERC) Report for the Voluntary Airport Low Emissions (VALE).
    • Years appear in blue boxes with thick black boarders.
    • Asterisk on years where a piece of equipment has reached the end of its useful life with corresponding end note "*One or more pieces of equipment have come to the end of their first useful life."
    • In the subtotal lines, "Subtotal" text replaced with scenario "Total" text.
    • Each year's "Net Change" sections replaced with single annual "Net ER" lines with a light yellow background.
    • Other minor format changes.
  • Fleet Database Updates:
    • Engine emission data incorporates Issue 19 of ICAO Aircraft Engine Emission Database (released April 15, 2013).
    • Incorporates data from the current version (as of March 1, 2013) of Aviation Environmental Design Tool's (AEDT) fleet database for consistency in future user transitions from EDMS to AEDT, EDMS's successor.
    • Includes over 17 new aircraft types:
      • 3Xtrim 3X47 Ultra and 3X55 Trener
      • Aerospatiale Helicopters: SA-341G/342 Gazelle, SA-350D Astar (AS-350), and SA-355F Twin Star (AS-355)
      • Airbus A350-800 and -900series
      • Antonov 148
      • Bell Helicopter 222
      • Boeing 787-8 and 787-9
      • Cessna 510 Citation
      • Eclipse 500
      • Embraer ERJ170-AR and ERJ190-AR
      • Robinson Helicopter R22B
      • Schweizer Helicopter 300C
      • and the freighter versions of several commercial airliners.
    • Includes 100 new engine types:
      • Rolls-Royce AE3007A2
      • BMW Rolls-Royce BR700-725A1-12
      • GE CF34-10A (2 variants)
      • GE CF34-10E (11 variants)
      • CFM CFM56-7B (16 variants)
      • Ivchenko-Progress ZMKB D-436T1
      • GE GEnx (20 variants)
      • Honeywell Aerospace HTF7000 (4 variants)
      • Pratt & Whitney Canada JT15F-4
      • Pratt & Whitney Canada PW307A & 307B
      • Pratt & Whitney PW4000 (6 variants)
      • Pratt & Whitney Canada PW600 (3 variants)
      • PowerJet SaM146 (2 variants)
      • Rolls-Royce Tay611-8C
      • Rolls-Royce Trent 1000 (21 variants)
      • Rolls-Royce Trent XWB
      • IAE V2500 SelectOne Upgrade (7 variants)
  • Users can enter PM2.5 : PM10 mass ratio for stationary sources.
  • The emissions inventory includes H2O emission for aircraft as well as the three components of PM emissions: non-volatile, volatile sulfates and volatile organics.

This release includes:

Instructions for upgrading 5.x to EDMS 5.1.4.1

  • If you already have EDMS 5.0, EDMS 5.0.1, EDMS 5.0.2, EDMS 5.1, EDMS 5.1.1, EDMS 5.1.2 or EDMS 5.1.3, download the update to EDMS 5.1.4.1: 5.0.x-5.1.4.1 (EXE) (dated August 2013), and download the documentation files above.
  • You do not need to apply for the BADA license again.

Instructions for ordering the EDMS 5.1.4.1 CD:

The EDMS 5.1.4.1 upgrade executable provided above will not work on an older 4.x version of EDMS. If you currently have an older version of EDMS that precedes version 5 and wish to use the features of EDMS 5.1.4.1, you will need to order EDMS 5.1.4.1 and obtain a free BADA license from EUROCONTROL as follows.

  1. Send the completed EDMS Order Request (PDF) to edms@cssiinc.com or call (202) 863-3706.
  2. Request a free license from EUROCONTROL

    EDMS 5 uses the EUROCONTROL Base of Aircraft Data ("BADA") for aircraft performance modeling. In addition to completing the EDMS Order Request, the user must also obtain a free license directly from EUROCONTROL for use of BADA.

    Please follow these steps when completing the license agreement:

    1. Complete the Licensee portion of the agreement to the best of your ability.
      1. Legal form of company refers to how the company is registered (e.g. non-profit, LLC, etc.)
      2. The registered office of which is at: (indicate where the company is registered)
    2. Complete the Requestee official credentials section
    3. Complete the intended use of BADA section
      1. Select: EDMS Purchase
      2. You must complete all of the fields in red regarding the project that requires the use of EDMS. Be sure to describe in detail the intended use of the software in more than just a few words. You cannot use EDMS for a comparative analysis of aircraft types, and must clearly state that you will not do this.
    4. Enter the security code

    Please do NOT contact EUROCONTROL for the status of your order or BADA license.

  3. Timing of EDMS Shipping

    Upon submission of the BADA license request, EUROCONTROL will notify the FAA that the request has been approved. Subsequently, CSSI Inc. will distribute the EDMS CD to the user.

EDMS Technical Support Questions:

Technical support is available via phone, fax, and email:

Other EDMS questions should be directed to:

EDMS 5 Weather Data Information

EDMS 5 generates input files for the powerful next-generation dispersion model developed by EPA, AERMOD. The AERMOD meteorological preprocessor, AERMET, requires a significant amount of weather data in order to accurately characterize the atmosphere. Surface data for each hour is required to determine the current wind direction, wind speed, temperature and cloud cover. In addition, twice-daily upper-air observations are required to properly determine the mixing height.

Ordering Weather Data

Weather data are available for a charge from the National Climatic Data Center (NCDC) and for free from the EPA Support Center for Regulatory Air Models (SCRAM) and WebMET.

Surface Data

AERMET supports the following surface weather data formats. NOTE that weather data downloaded from the NCDC website are NOT compatible with AERMOD, so the NCDC data from CD-ROM must be used instead.

  • TD-3280: Historical and recent data can be ordered from NCDC.
  • TD-3505: Historical and recent data can be ordered from NCDC.
  • CD-144: Current data are not available from NCDC. However, users that already have CD-144 data can use it with the AERMET algorithms included in EDMS 4.3.
  • HUSWO: Historical and recent data can be ordered from NCDC.
  • SCRAM: Historical data are available from EPA at SCRAM. Choose "Met Data" then "Surface Data." Data are also available from WebMET.
  • SAMSOM: Recent data can be ordered from NCDC. Historical data are also available from WebMET.

Upper-Air Data

Currently, only the TD-6201 and FSL formats are supported for the required twice-daily upper-air soundings.

One of these soundings must occur in the early morning hours. Typically, these soundings occur at 00:00Z and 12:00Z, which does not provide a sounding at the necessary time for many users outside the United States. If a sounding is not available for your location, the Lakes Environmental Upper Air Estimator may be appropriate. Specific guidance regarding the AERMET data requirements are provided in the AERMET User’s Guide.

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