Official Release of EMFAC2014 Motor Vehicle Emission Factor Model for Use in the State of California

The Environmental Protection Agency (EPA) is approving and announcing the availability of the latest version of the California EMFAC (short for EMission FACtor) model for use in state implementation plan (SIP) development and transportation conformity in California. EMFAC2014 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 emissions factors for passenger cars, trucks, motorcycles, motor homes and buses. Today's notice also sets the date after which EMFAC2014, rather than EMFAC2011, must be used to satisfy the requirement that conformity determinations be based on the latest emissions model available. This requirement can be met by using the most current version of the motor vehicle emissions model approved by the EPA. Since the EMFAC model is used only in California, the EPA's approval and the announcement of the availability of the model does not affect the applicability of the Motor Vehicle Emissions Simulator (MOVES) model for users in other states.