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Model Report


Last Revision Date: 12/02/2011 View as PDF
General Information Back to Top
Model Abbreviated Name:

Model Extended Name:

Model Overview/Abstract:
MOBILE6.2 is a computer program that estimates hydrocarbon (HC), carbon monoxide (CO), oxides of nitrogen (NOx), exhaust particulate matter (which consists of several components), tire wear particulate matter, brake wear particulate matter, sulfur dioxide (SO2), ammonia (NH3), six hazardous air pollutant (HAP), and carbon dioxide (CO2). These emission factors are calculated for gasoline-fueled and diesel highway motor vehicles, and for certain specialized vehicles such as natural-gas-fueled or electric vehicles that may replace them. The program uses the calculation procedures presented in technical reports posted on EPA's MOBILE6 Web page

MOBILE6 calculates emission factors for 28 individual vehicle types in low- and high-altitude regions of the United States. MOBILE6 emission factor estimates depend on various conditions, such as ambient temperatures, travel speeds, operating modes, fuel volatility, and mileage accrual rates. Many of the variables that affect vehicle emissions can be specified by the user. MOBILE6 will estimate emission factors for any calendar year between 1952 and 2050, inclusive. Vehicles from the 25 most recent model years are considered to be in operation in each calendar year.

Model Technical Contact Information:
U.S. EPA Office of Air and Radiation (OAR)
Office of Transportation and Air Quality (OTAQ)
Assessment and Standards Division (ASD)
Model Homepage: http://www.epa.gov/otaq/m6.htm

User Information Back to Top
Technical Requirements
Computer Hardware
The minimum microcomputer hardware configuration required by MOBILE6 for DOS machines is:
IBM-compatible 80386 (or better, such as 80486 or Pentium). At least 8 megabytes of RAM memory. Math coprocessor chip (such as Intel 80387).
Compatible Operating Systems
The MOBILE6 executable is designed to operate in a DOS or Windows environment. The source code (written in FORTRAN90) is provided so that a user may recompile it to use with other operating systems.
Download Information
A single "zip" archive (about 3 Megabytes in size) containing the program and associated files can be downloaded from: http://www.epa.gov/otaq/m6.htm
Using the Model
Basic Model Inputs
The inputs are described in Chapter 2 of the User's Guide.
Basic Model Outputs
The outputs are described in Chapter 3 of the User's Guide.
User Support
User's Guide Available?
The User's Guide is included in the "zip" archive (about 3 Megabytes in size) containing the program as well as a standalone document. Download from: http://www.epa.gov/otaq/m6.htm

Model Science Back to Top
Summary of Model Structure and Methods
The scientific basis for the model is given in the individual reports that document the model. These reports are available at:

The equations and algorithms are given in the individual reports that document the model.

Model Evaluation
A sensitivity analysis of the "6.0" version of the model is available at:

Comments from peer reviewers are available in each individual reports that document the model. (See "Scientific Detail" above.)

Additionally, the Coordinating Research Council (CRC) had Environ do a comparison of MOBILE6 results to ambient and other data. ("Evaluation of the U.S. EPA MOBILE6 Highway Vehicle Emission Factor Model," CRC Project E-64, by Environ International Corp., March 2004.)

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