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  MOBILE6 has been replaced by MOVES as EPA’s official model for estimating emissions from cars, trucks and motorcycles.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: mobile@epa.gov
• 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.

• MOBILE6 Model
• Presentations
• Training
• Technical Documentation
• Workshop Documents
• Main mobile sources modeling page
• Related Links

MOBILE6 Model

• 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 http://www.download.com ) 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.

• Federal Register Notice of Availability:  Official Release of MOBILE6.2 Motor Vehicle Emissions Factor Model (PDF) (3 pp , 154 K, published May 19, 2004)
• Policy Guidance on when MOBILE6 must be used for State Implementation Plans and Conformity (PDF) (14 pp, 105K) This document lists questions and answers on how and when to use MOBILE6 in SIP development and transportation conformity decisions.
  • Clarification of Policy Guidance for MOBILE6 SIPs in Mid-Course Review Areas (PDF) (2 pp, 112K)
• Technical Guidance on the Use of MOBILE6.2 for Emission Inventory Preparation -- This document provides EPA guidance on appropriate input assumptions and sources of data for the use of MOBILE6.2 in SIP and conformity related submissions.
  • Cover Memo (PDF) (1 pg, 43K)
  • Technical Guidance (PDF) (82 pp, 340 K, EPA420-R-04-013, August 2004)
  • Diesel sulfur levels by county (PDF) (634 pp, 1.3MB, see section 5.5 of the Technical Guidance document, above)
• Technical Description of the Toxics Module for MOBILE6.2 and Guidance on Its Use for Emission Inventory Preparation - This document describes the methodology used to estimate air toxic emission rates in the toxics module for MOBILE6.2, describes the sources of data used, and provides users with guidance on how to obtain data required as input parameters for the model.  The document also compares some MOBILE6.2 results to results using a previous highway mobile source toxics emission factor model, MOBTOX5b.
  • Technical Guidance: Technical Description of the Toxics Module for MOBILE6.2 and Guidance on Its Use for Emission Inventory Preparation(PDF) (34 pp, 589K, EPA420-R-029, November 2002)

• Sensitivity Analysis of MOBILE6.0 (PDF) (64 pp, 1.3MB, EPA420-R-02-035, December 2002) This report presents a systematic study of the relative importance of various MOBILE6 input parameters.

• 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:

• MOBILE6 Presentations, April 4, 2001, North American Motor Vehicle Emissions Control Conference (NAMVECC), Atlanta.
  • Overview and Comparison to MOBILE5 (PDF) (15 pp, 113K)
  • Input/Modeling Guidance and SIP/Conformity Policy (PDF) (18 pp, 19K)
• MOBILE6 Presentation, March 26, 2001, Coordinating Research Council On-Road Vehicle Emissions Workshop, San Diego (PDF) (13 pp, 106K)
• MOBILE6 Presentation, March 27, 2000, Coordinating Research Council On-Road Vehicle Emissions Workshop, San Diego (PDF) (17 pp, 110K)
• MOBILE6 Presentation, December 9, 1998, Air and Waste Management Association meeting, New Orleans
  • Slides (PDF) (11 pp, 38K)
  • Paper (PDF) (18 pp, 70K)

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MOBILE6 Training

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

• 5-Day Training presented in Seattle, September 2001
  • ReadMe (TXT)
  • PowerPoint presentation given on the first day of the course (PDF) (195 pp, 2.4MB). This is a basic introduction to on-road emissions modeling and MOBILE6. It can serve as a stand-alone class for managers and others who will not perform analyses using the model.
  • Training Manual for the five day course:
    • Day 1 (PDF) (200 pp, 1.3MB)
    • Day 2 (PDF) (70 pp, 255K)
    • Day 3 (PDF) (127 pp, 780K)
    • Day 4 (PDF) (59 pp, 275K)
    • Day 5 (PDF) (99 pp, 300K)
  • During the second through fifth days of the training, numerous examples were worked in class. The examples are given in the training manual. The solutions to those examples are given in these four files:
    • Day 2 (PDF) (90 pp, 260K)
    • Day 3 (PDF) (12 pp, 160K)
    • Day 4 (PDF) (54 pp, 250K)
    • Day 5 (PDF) (10 pp, 90K)
• Computer-based training 1.9M ZIP.
  After unzipping, please see the "ReadmeCD.txt" file for instructions.

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

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Related Links:

• Technical Background
• Workshop Documents
• Evaluation of the U.S. EPA MOBILE6 Highway Vehicle Emission Factor Model, Coordinated Research Council Project E-64 (PDF) (186 pp, 3.8MB, published March 2004)

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