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msei -- EMFAC2011 Public Release Posted: 30 Sep 2011 14:25:46
The California Air Resources Board is announcing the release of EMFAC2011. An overview of improvements to EMFAC for EMFAC2011 is available at: http://www.arb.ca.gov/msei/emfac2011-release-document-final.pdf A multi-level searchable database of EMFAC2011 output, the EMFAC2011 modules, on-line training presentations, frequently asked questions, and technical documentation is available at: http://www.arb.ca.gov/msei/msei.htm If you have questions, please email the Mobile Source Emissions Inventory Branch staff at email@example.com and we will respond promptly to your requests. Background EMFAC is Californiaís model for estimating on-road mobile source emissions inventories for air quality and transportation planning, regulatory assessment, and project-level assessment. This update is required to meet federal air quality and transportation planning guidelines. EMFAC2011 has been updated with the latest information on vehicle populations and miles traveled in California. It reflects recently adopted diesel regulations including the Truck and Bus Rule and other diesel fleet rules, and recently adopted greenhouse gas regulations including the Pavley Clean Car Standard and the Low Carbon Fuel Standard. It has been updated with the latest inventory methods for heavy duty trucks and buses, which reflect the impact of the economic recession. Earlier this year ARB submitted SIP revisions to the U.S.EPA for PM2.5 and ozone standards. Those demonstrations incorporated truck emissions estimates from EMFAC2011. To make accessing EMFAC2011 easier, ARB has developed two new database tools that provide EMFAC2011 emissions and emission rates, at variable levels of detail, over the internet. In order to accommodate the updates to inventory methods and to reflect recently adopted rules, staff modernized the structure of the EMFAC model. EMFAC2011 is comprised of three modules. The first module, named EMFAC2011-LDV, estimates passenger vehicles emissions. A second module, called EMFAC2011-HD, estimates emissions from diesel trucks and buses. A third module integrates the output of EMFAC2011-LDV and EMFAC2011-HD and provides users with the ability to conduct scenario assessments for air quality and transportation planning. The third module is called EMFAC2011-SG. All three modules are available for download through our web site.