Research for the AASHTO Committee on Environment and Sustainability. Task 7. Evaluation of Mobile Models: MOBILE 6.1, MOBILE 6.2 and MOBILE6/CNG

MOBILE6 is a highway mobile source emission factor model developed by the U.S. Environmental Protection Agency (EPA) that calculates factors for NOx (Nitrogen Oxides), VOC (volatile organic compounds) and CO (carbon monoxide) in grams of pollutant per mile traveled. Departments of transportation (DOTs) and metropolitan planning organizations (MPOs) rely on the model to assess the air quality impacts of their transportation plans and projects to meet the requirements of ISTEA (1991) and the Clean Air Act amendments of 1990. The latest version of the model includes emissions factors for particulate matter and components that contribute to secondary formation of fine particulate matter (PM2.5) from exhaust, brake wear, and tire wear. Concerns have been expressed about the accuracy and reliability of the model. The objectives of this effort are to evaluate MOBILE6.1/6.2 for accuracy and to understand and assess the validation of these modules. This will include assessments of the emission factors related to particulate matter, the emission factors related to air toxics, and the emission factors when compressed natural gas (CNG) is specified as the fuel. Status is completed; final report (1,075 KB, 134 pp.) is available in Adobe PDF.


  • English


  • Status: Completed
  • Contract Numbers:

    Project 25-25, Task 7

  • Sponsor Organizations:

    Federal Highway Administration

    1200 New Jersey Avenue, SE
    Washington, DC  United States  20590

    American Association of State Highway and Transportation Officials (AASHTO)

    444 North Capitol Street, NW
    Washington, DC  United States  20001

    National Cooperative Highway Research Program

    Transportation Research Board
    500 Fifth Street, NW
    Washington, DC  United States  20001
  • Project Managers:

    Hedges, Christopher

  • Performing Organizations:

    Parsons Brinckerhoff

    3200 Tower Oaks Boulevard
    Rockville, MD  United States  20852
  • Principal Investigators:

    Dulla, Robert

  • Start Date: 20031006
  • Expected Completion Date: 0
  • Actual Completion Date: 20040630
  • Source Data: RiP Project 8594

Subject/Index Terms

Filing Info

  • Accession Number: 01459058
  • Record Type: Research project
  • Source Agency: National Cooperative Highway Research Program
  • Contract Numbers: Project 25-25, Task 7
  • Files: RiP, USDOT
  • Created Date: Jan 3 2013 12:55PM