Emissions Models and Other Methods to Produce Emission Inventories
- trends analysis
- regional and local scale air quality modeling
- regulatory impact assessments
human exposure modeling.
Inventories of air pollution from mobile sources are often produced by emissions models such as the MOtor Vehicle Emission Simulator (MOVES). See the following resources for information and guidance on preparing mobile source inventories.
- General Guidance for Preparing Inventories
- Estimating Commercial Marine Emission Inventories and Port Emissions
- Estimating Emissions from Locomotives
- Estimating Emissions from Aircraft
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- See EPA's policies and guidance for modelers producing mobile source air pollution inventories for regulatory purposes such as State Implementation Plans (SIPs) and conformity determinations.
- Procedures for Emission Inventory Preparation - Volume IV: Mobile Sources (December 1992) from National Transportation Library of the US Department of Transportation: the procedures it describes for highway vehicles and nonroad equipment are out-of-date, but the document may still be useful for creating inventories for some aircraft, and for reference on historical procedures for other mobile source categories.
EPA has developed new marine inventory techniques that are more similar to the techniques we use for mobile sources generally, and rely on emission factors, population estimates, and usage characteristics. States and other stakeholders are encouraged to refer to the inventories we prepared for our commercial marine diesel engine standards for use in developing their own inventories.
- Category 3 Marine Diesel Engines - Final Emission Standards Final Regulatory Support Impact Analysis (PDF) (527 pp, 9.7MB, EPA420-R-09-019, December 2009): Chapter 3, for EPA's 2010 rule, "Control of Emissions from New Marine Compression-Ignition Engines at or Above 30 Liters per Cylinder", contains our inventory estimates and a description of how those estimates were produced for Category 3 commercial marine vessels.
- Final Regulatory Impact Analysis: Control of Emissions of Air Pollution from Locomotives and Marine Compression-Ignition Engines Less Than 30 Liters per Cylinder (PDF)(739 pp, 19MB, EPA420-R-08-001a, May 2008): for EPA's 2008 rule, "Control of Emissions of Air Pollution from Locomotives and Marine Compression-Ignition Engines Less Than 30 Liters per Cylinder ", Chapter 3 contains our inventory estimates and a description of how those estimates were produced for Category 1 and 2 commercial marine vessels.
- Current Methodologies in Preparing Mobile Source Port-Related Emission Inventories describes current practices for calculating emissions from mobile emission sources at ports, including oceangoing vessels, harbor craft, and cargo handling equipment, as well as other land-side mobile emission sources at ports, such as locomotives and on-highway vehicles.
- Emission Factors for Locomotives (PDF) (9 pp, 260K, April 2009, EPA420-F-09-025): this fact sheet lists emission factors for locomotives and provides instructions for preparing locomotive emission inventories based on these factors and annual fuel consumption rates.
Emissions from aircraft are usually estimated with a Federal Aviation Administration Model. Additional information on aviation emissions is available at the EPA Aviation website.
- Federal Aviation Administration Emissions and Dispersion Modeling System
- EPA information about air pollution emissions from aircraft