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MSEI - Modeling Tools - EMFAC Software and Technical Support Documentation

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EMFAC2021 (U.S. EPA Approved)
EMFAC2021 and EMFAC2017 Interim Off-Model Adjustment Factors for the Heavy-Duty Inspection and Maintenance Program
EMFAC2017 (U.S. EPA Approved)
EMFAC2017 Updates

Updates from v1.0.2 to v1.0.3

  • Fixed a bug in custom activity (SG) mode related to multi-year speed profiles entries
  • Fixed a bug related to methane (CH4) speciation for gasoline vehicles

Updates from v1.0.1 to v1.0.2

UpdatesImpacts
ModeVehicleModel YearCalendar YearPollutant
Update to MY2022—2024 CO2 emission ratesAllLDV2022—20242022—2050CO2, Fuel
Update to UBUS VMTAllUBUSAllAllVMT
      
EMFAC2017 Adjustment Factors
EMFAC2014 (U.S. EPA Approved)
EMFAC2014 Updates

Updates From v1.0.1 to v1.0.7 

UpdatesImpacts
ModeAreaVehicleModel YearCalendar YearPollutant
Added pre-1965 population from DMV to model year 1965AllAllLDV19652000-2008All
Added evaporative, and tire & brake wear emissions for pre-2000 model year electric vehicles in San Diego and Imperial countiesAllSan Diego & Imperial CountyLDA & LDT1Pre-20002000-2043HC,ROG,
TOG,PM,
PM2.5,PM10
Revised codes for Custom Activity to correctly scale emissions by speed fractions when multiple inputs are loadedCustom Activity Batch ProcessAllAllAllAllAll
Revised CO2 emission rates for LDT2 and MDV under Advanced Clean Cars (ACC)EmissionsAllGas LDT2 & MDV>2022>2022CO2*,Fuel,
SOx
Excluded Auxiliary Power Systems (APS) from T7 idle emission ratesEmission RatesAllT7<2008>2007All