MOBILE6 Vehicle Emission Modeling Software

This Web page provides the MOBILE6 Vehicle Emission Modeling Software and related presentations and training resources.  MOBILE6 is an emission factor model for predicting gram per mile emissions of Hydrocarbons (HC), Carbon Monoxide (CO), Nitrogen Oxides (NOx), Carbon Dioxide (CO2), Particulate Matter (PM), and toxics from cars, trucks, and motorcycles under various conditions.  MOBILE6 has been replaced by MOVES as EPA’s official model for estimating emissions from cars, trucks and motorcycles.   Information about MOVES, including policy guidance on when it must be used for State Implementation Plans and transportation conformity determinations is available here

For further information or assistance regarding this web page or MOBILE6:

  • MOBILE Model Information Contact:  fax:  (734) 214-4939 or email:
  • EPA-MOBILENEWS Listserver:  Full description and subscription information

NOTE: You will need Adobe Acrobat Reader, available as a free download, to view some of the files on this page. See EPA's PDF page to learn more about PDF, and for a link to the free Acrobat Reader.


  • MOBILE62.ZIP -- This zipped file allows users to download the MOBILE6.2 model, including HC, CO, NOx, PM air toxics, user guide, supporting documentation, a "frequently asked questions" list, source code, and sample input and output files. This file includes the updated PM emission factors for heavy duty diesel vehicles. The file can be unzipped with standard software such as WinZip.  A "read-me" file explains the next steps for setting up and using the model. (March 2006) 3.4M ZIP (Free zip software is available at ) If you already have the current MOBILE6 model, but need the new PM emission factors, you can download and use just the updated PM emission factors here.  MOBILE6 will not work on a 64 bit computer. If you have a 64 bit computer and need to use MOBILE6, try using the 32 bit emulation mode in Windows7.

  • MOBILE6 User Guide (PDF) (262 pp, 502K, EPA420-R-03-010, August 2003) This guide (also in MOBILE62.ZIP) provides detailed instructions for setting up and running MOBILE6 emission scenarios.
  • MOBILE6.2 Policy Guidance (PDF) (13 pp, 672K, February 24, 2004) This guidance clarifies how and when the current version of MOBILE6.2 can be used for SIPs and conformity purposes.
  • Frequently Asked Questions (PDF) (42 pp, 140K, EPA420-B-03-013, November 2003) This document (an October 2003 version is also in MOBILE62.ZIP) lists questions from MOBILE6 users and answers from EPA staff.
  • Excel spreadsheet and Windows program to calculate the humidity ratio in grains of water per pound of dry air using relative humidity, barometric pressure, and ambient temperature as input. (February 2002)  16K XLS
  • Federal Register Notice of Availability:  Official Release of the MOBILE6 Motor Vehicle Emissions Factor Model (PDF) (4 pp, 141 K, published January 29, 2002)

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MOBILE6 Presentations:

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MOBILE6 Training

EPA has developed a variety of training materials for MOBILE6 users.  Also see the MOBILE6 user guide above.

Comments and questions should be sent by email to Please make sure to include your name and organizational affiliation on any comments.

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