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Emission Inventory Information & Preparation

This web site contains "Procedure for Emission Inventory Preparation - Volume IV: Mobile Sources" (document number EPA 420-92-009). Also found are several EPA papers that describe the "Effects of Raising Speed Limits on Vehicle Emissions."

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.

Estimating Commercial Marine Emission Inventories

EPA's current marine inventory guidance document (Procedures for Emission Inventory Preparation, Volume IV: Mobile Sources, EPA420-R-92-009, December 1992) uses modeling techniques based on fuel consumption that were common at that time. Since then, we have developed new marine inventory techniques as part of our rulemaking process for emission standards for commercial marine diesel engines. These techniques are more similar to the techniques we use for mobile sources generally, and rely on emission factors, population estimates, and usage characteristics. We are currently using these techniques to update our marine inventories and to develop marine components for our MOVES model. This new work will provide the foundation for a new marine inventory guidance document, including more research into emission factors, population, and operating characteristics. Until this work is completed, 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. Chapter 7 of the Final Regulatory Support Document (EPA420-R-03-004, January 2003) for EPA's 2003 rule, "Control of Emissions from New 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. Chapter 5 of the Final Regulatory Impact Analysis (EPA420-R-99-026, November 1999) for EPA's 1999 rule, "Control of Emissions from Marine Diesel Engines", contains our inventory estimates and a description of how those estimates were produced for Category 1 and 2 commercial marine vessels.

Effects of Raising Speed Limits on Vehicle Emissions

October 1996 Local Transportation data in Mobile Source Inventories, Final 173K ZIP WP5

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