On-Road Emission Inventory Model - Previous Versions

This page last reviewed April 14, 2010

EMFAC2002
EMFAC2001
EMFAC2000

MVEI7G
EMFAC/BURDEN7F

EMFAC2002 - April 6, 2003

Major Revisions




Documentation




Major Revisions




Documentation



Software

EMFAC2002 [4MB] Dated April 2003
User 's Guide zipped [MSWord 1.2MB] [PDF 1MB]
Training Materials

EMFAC2001
Version 2.08 (May 2002)  was used as the basis of the 2002 California Almanac of Emissions and Air Quality.

Major Revisions

  • Eliminated Diesel Start Emissions
  • Removed SCAG Activity Information

Documentation

Software



Version 2.07 (Oct 2001) was used in benefit analysis for the ZEV Amendments.

Major Revisions

  • Corrected Anomaly in the I/M Benefits Calculation
  • Adjusted the fuel Correction Factors for Low Sulfur Diesel
  • Corrected the Benefit Estimate for USEPA 2007+ Heavy-duty standards
  • Modified the Benefit Estimate for LEVII/TierII
  • Included SCAG Activity Information

Version 2.06 (July 2001) was used in support of the Santa Barbara Plan.

Major Revisions

  • Inadvertently Added Diesel Start Emissions
  • Corrected Diurnal Emissions Equation
  • Corrected Hot Soak Normalization Issue
  • Corrected Non-Catalyst Equipped/Catalyst Equipped Fleet Split
  • Added Additional Chassis Dynamometer Data for Heavy-Duty Gasoline Powered Trucks
  • Included LEVII and TierII Programs
  • Added Evaporative Emissions for ZEVs
  • Added New Standards for Urban Buses
  • Modified the Air Conditioning Correction Factors based on Public Comment
  • Updated Idle Emission Rates
  • Corrected Gasoline and Diesel Tech Fraction Problem
  • Updated School Bus Activity Estimates
  • Updated Unregistered Vehicle Estimates
  • Revised Activity (Santa Barbara / North Central Coast / MTC / San Diego / and portion of San Joaquin Valley)

Documentation

  • EMFAC 2001 Workshop Invitation in May 2001


EMFAC2000
Version 2.02 -Bay Area had updated activity estimates for the Bay Area and was used in the 2001 Bay Area Plan. Version 2.02 is the official version of EMFAC2000.

Major Revisions

  • County specific Fleet Characterization
  • Expanded Age Distribution
  • Addition of School Bus and Motor Home Classes
  • twenty-Four Hourly Periods of Analysis
  • Monthly Inventory Estimation
  • Addition of Evaporative "Liquid Leakers"
  • Added "Smoking" Vehicles to PM Inventory
  • Switch to cycle based (UDDS) Heavy-duty Vehicle Inventory
  • Updated I/M Benefit Estimates

Documentation

Software




MVEI7G In November of 1997, in accordance with SB2174 (Polanco), the emissions inventory was presented to the ARB and was approved.  The model presented at that time was MVEI7G, version 1.0 corrected, which has the June 1997 activity data. Currently, the July 1998 modifications are included in the model.  A comprehensive list of differences between the models is included.

Major Revisions

  • Added Cycle Correction Factors
  • Added CO2 to the model
  • Improved Starts Methodology - Start Activity
  • Added Clean Diesel Fuel Benefits
  • Added GUI Interface


Models and documentation are available.

For information, please contact Jeff Long at (626) 450-6140.

EMFAC/BURDEN7F This version is the basis of the California State Implementation Plan for Ozone as
submitted to the U.S. EPA on November 15, 1994 and approved by the U.S. EPA on
September 25, 1996. All four volumes are available in hard copy via the ARB's Public
Information Office identified below. The first revision to the statewide strategies in the
1994 SIP was adopted February 26, 1998 and amended a measure for heavy-duty
trucks and buses. This revision has not yet been approved by U.S. EPA

Major Revisions

  • Modeled Evaporative Emissions be Time of Day
  • Updated Basic Emissions Rates/ Speed Correction and Temperature Correction Factors
  • Updated Cumulative Mileage Curves and Travel Activity
  • Added Phase II Gasoline and Oxygenate Benefits


EMFAC/BURDEN7F is not amenable to distribution via the Internet. For information, please contact Jeff Long at (626) 450-6140.



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