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Modeling and Inventories

MOBILE Model (on-road vehicles)

This web page contains information on the MOBILE vehicle emission factor model, which is a software tool for predicting gram per mile emissions of hydrocarbons (HC), carbon monoxide (CO), oxides of nitrogen (NOx), carbon dioxide (CO2), particulate matter (PM) and air toxics from cars, trucks, and motorcycles under various conditions. MOBILE has been replaced by MOVES as EPA’s official model for estimating emissions from cars, trucks and motorcycles.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 the MOBILE model:

Description and history of the MOBILE Model (1978-2010)

MOBILE6
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 HC, CO, NOx, CO2, PM, and toxics from cars, trucks, and motorcycles under various conditions.

In-Use Exhaust Deterioration
This web page describes the basic methodology and key issues when comparing the results obtained by MOBILE5 with that of MOBILE6. In-use exhaust deterioration refers to the modeling of vehicle mileage.

MOBILE5
This web page provides the MOBILE5 Vehicle Emission Modeling Software and related information for MOBILE5a, MOBILE5a-h, and MOBILE5b. MOBILE5 is a computer program that estimates HC, CO, and NOx emission factors for gasoline-fueled and diesel highway motor vehicles. MOBILE5 is now considered obsolete.

AP-42: Compilation of Air Pollutant Emission Factors - Volume II: Mobile Sources
"Compilation of Air Pollutant Emission Factors, Volume II: Mobile Sources" (AP-42) is no longer being updated or maintained by EPA.

PART 5: Highway Vehicle Particulate Emission Modeling Software
This web page provides the Particulate Emission Factor Model, also known as PART5, and related documentation and informational sheets. PART5 calculates particle emission factors in grams per mile from on-road automobiles, trucks, and motorcycles, for particle sizes of 1-10 microns. PART 5 is now considered obsolete.

Related Information:

Emission Inventories
This web site contains the document, "Procedure for Emission Inventory Preparation - Volume IV: Mobile Sources" and several EPA papers that describe the effects of raising speed limits on vehicle emissions.

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