Skip to content U.S. Department of Transportation/Federal Highway AdministrationU.S. Department of Transportation/Federal Highway Administration
Office of Planning, Environment, & Realty (HEP)


EMFAC2007 is the latest update to the EMFAC model for use by California state and local governments to meet Clean Air Act (CAA) requirements. The new model, which is based on new and improved data, calculates air pollution emission factors for passenger cars, trucks, motorcycles, motor homes and buses. Because the EMFAC model is used only in California, EPA's approval of the model does not affect MOBILE model users in other states.


Policy & Guidance

PDF files can be viewed with the Acrobat® Reader®

Updated: 11/3/2014
HEP Home Planning Environment Real Estate
Federal Highway Administration | 1200 New Jersey Avenue, SE | Washington, DC 20590 | 202-366-4000