EMFAC2021 Model and Documentation

EMFAC2021 Off-Model Adjustment Factors to Remove the Impact of Advanced Clean Trucks, Zero-Emission Airport Shuttle, Heavy-Duty Omnibus and Warranty Phase I Regulations	EPA Off-Model Adjustment Factors Approval Letter Attachment A – Description of EMFAC2021 Adjustment Factors Appendix A – EMFAC2021 Adjustment Factors
EMFAC2021 Off-Model Adjustment Factors for the Heavy-Duty Inspection and Maintenance Program (now known as Clean Truck Check) and U.S. EPA’s Clean Trucks Plan. (Factors not yet approved by U.S. EPA)	Appendix A - Clean Truck Check Factors Appendix B - Clean Trucks Plan Factors
EMFAC2021 Interim Off-Model Adjustment Factors for the Heavy-Duty Inspection and Maintenance Program	EPA Approval Letter (5/26/23) Appendix A: EMFAC2021 Interim Adjustment Factors (5/26/23)
EMFAC2021 (U.S. EPA Approved)	EMFAC2021 approval notice in the Federal Register - 11/15/2022 EMFAC2021 (v1.0.2) Public Release Notice - 5/2/22 EMFAC2021 (v1.0.1) to (v1.0.2) Updates - 5/2/22 EMFAC2021 Software Installation Package (v1.0.2) - 5/2/22 EMFAC2021 (v1.0.1) Public Release Notice - 4/30/21 EMFAC2021 Software Installation Package (v1.0.1) - 4/28/21 EMFAC2021 (v1.0.0) to (v1.0.1) Updates - 4/28/21 EMFAC2021 PL Handbook - 3/26/21 EMFAC2021 Technical Document - 4/28/21 PHEV Start Analysis Draft Memo - 3/26/21 EMFAC2021 (v1.0.0) Public Release Notice - 1/15/21 EMFAC2021 User’s Guide

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