EPA approves the use of EMFAC2014 for SIP and conformity analyses

The U.S. EPA approved the use of the EMFAC2014 emissions model for State Implementation Plan (SIP) and conformity purposes, effective December 14, 2015. The model is based on new and improved data, and calculates air pollution emissions factors for passenger cars, trucks, motorcycles, motor homes, and buses. EMFAC2014 must be used for all new regional emissions analyses and carbon monoxide (CO) and particulate matter (PM10 and PM2.5) hot-spot analyses for transportation conformity purposes that are started on or after December 14, 2017. For more information, please visit: