Air Quality Planning and Science Division | California Air Resources Board

EMFAC Training Materials

ARB provides training materials such as handbooks and webinars on EMFAC and mobile source emissions inventory.

EMFAC2021 Training Materials	EMFAC2021 User’s Guide EMFAC2021 PL Handbook EMFAC2021 Technical Document
EMFAC2017 Training Materials	EMFAC2017 User's Guide EMFAC2017 PL Handbook EMFAC2017 Technical Documentation EMFAC2017 November Workshop Demo Video
EMFAC Web Platform	Introduction to the website Tutorial on Emissions Inventory Tutorial on Project Analysis Tutorial on Scenario Analysis Tutorial on Fleet Database
EMFAC Training	June 2015 EMFAC2014 Online Training Webinar Presentation Document Video Presentation Part 1: Introduction Video Presentation Part 2: Major Model Changes Video Presentation Part 3: Project Type Guidance Video Presentation Part 4: Model Installation and Default Activity Emissions Mode Video Presentation Part 5: Custom Activity Emissions Mode Video Presentation Part 6: Project Level Assessment Video Presentation Part 7: EMFAC Database

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EI Support and Regulations

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Advanced Clean Fleets

Program Page | Regulatory Documents | Inventory Methodology
Board Meetings (October 27, 2022, April 27, 2023)
Final Inventory

Advanced Clean Cars II

Program Page | 2022 Documentation (Appendix B) | Regulatory Documents
Board Meeting - 08/25/2022
Final Inventory

Heavy-Duty Inspection and Maintenance

Program Page | 2021 Documentation (Appendix D) | Regulatory Documents
Board Meeting - 12/09/2021
Final Inventory

Heavy-Duty Omnibus

Program Page | 2020 Documentation (Appendix D) | Regulatory Documents
Board Meeting - 08/27/2020
Final Inventory

Advanced Clean Trucks

Program Page | 2019 Documentation (Appendix D) | Regulatory Documents
Board Meeting - 06/25-26/2020

Innovative Clean Transit

Program Page | 2018 Documentation (Attachment C) | Regulatory Documents
Board Meeting - 12/13-14/2018

Warranty Phase I

Program Page | 2018 Documentation (Appendix F) | Regulatory Documents
Board Meeting - 06/28/2018

Amendments to HDVIP/PSIP

Program Page | 2018 Documentation (Appendix C) | 2010 Rule Update ISOR Executive Summary | November 2010 Support Data | Regulatory Documents
Board Meeting - 05/25/2018

Advanced Clean Cars

Program Page | 2011 Documentation (Appendix T) | Regulatory Documents
Board Meeting - 01/26-27/2012

Truck and Bus

Program Page | 2010 Documentation (Appendix G) | 2008 Rule Board Meeting Slides | 2008 Rule News Clips | 2008 Documentation (Appendix G) | Regulatory Documents
Board Meeting - 12/17/2010

Drayage Trucks

Program Page | 2010 Documentation (Appendix G) | 2007 Documentation (Appendix B) | Regulatory Documents
Board Meeting - 12/17/2010

Public / Utility Fleets

Program Page | 2006 Documentation (Appendix B) | Regulatory Documents
Board Meeting - 12/05/2005

Solid Waste Collection Vehicles

Program Page | 2003 Documentation (Staff Report - Revised Appendix E) | 2003 Documentation (Staff Report - Appendix E) | Regulatory Documents
Board Meeting - 09/25-26/2003

Clean Cars Standards - Pavley, Assembly Bill 1493

2008 Documentation | 2008 Documentation Addendum

SB 375 - Sustainable Communities

Program Page | Regional Plan Targets

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Riverside MOU signing

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Mobile Source Emissions Inventory Support

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Category specific emissions estimates have been developed over the past several years in support of specific agency regulatory objectives. The EMFAC emissions model is developed and used by CARB to assess emissions from on-road vehicles including cars, trucks, and buses in California, and to support CARB's regulatory and air quality planning efforts to meet the Federal Highway Administration's transportation planning requirements. US EPA approves EMFAC for use in State Implementation Plan and transportation conformity analyses. In the past CARB released the Off-Road model which calculated emissions from off-road sources. The Off-Road model is now being replaced by category specific methods and inventory models that are being developed for specific regulatory support projects. The categories listed below have been or are being updated with new methods and data. Where available, new inventories and models are provided.

Mobile Source Inventories for California	EMFAC Web Platform for EMFAC2021, EMFAC2017, and OFFROAD2021 ORION
On-Road Category	EMFAC2014 Database (US EPA Approved) EMFAC Software and Documentation EMFAC Off-Model Adjustment Factors (US EPA Approval Letter) SAFE Vehicles Rule Effects on Regional Transportation Plans, Programs, and Project Delivery - Frequently Asked Questions EMFAC Off-Model CO₂ Adjustment Factors Announcement - 6/26/20 EMFAC Off-Model CO₂ Adjustment Factors Document - 6/26/20 META Tool for 2020 Mobile Source Strategy (Draft Version) - 10/2/20
Off-Road Equipment	ORION Database OFFROAD2007 Model OFFROAD Documentation META Tool for 2020 Mobile Source Strategy (Draft Version) - 10/2/20

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Mobile Source Emissions Inventory Support

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On-Road (EMFAC)

The EMFAC emissions model is developed and used by CARB to assess emissions from on-road vehicles including cars, trucks, and buses in California, and to support CARB's regulatory and air quality planning efforts. US EPA approves EMFAC for use in State Implementation Plan and transportation conformity analyses.

EMFAC Web Platform	On Road Emissions and Emission Rates Project Analysis Scenario Analysis Fleet Database
EMFAC2025 Model	EMFAC2025 Model and Documentation
EMFAC2021 Model	EMFAC2021 Model and Documentation
EMFAC2017 Model	EMFAC2017 Model and Documentation
EMFAC2014 Model and Older	EMFAC2014 and Previous Versions
Emissions Inventory Support for Regulations	EI Support for Regulations

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Sacramento Traffic

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Mobile Source Emissions Inventory Support

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Conferences and Workshops - Conferences

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This page lists the public conferences hosted by the Mobile Source Analysis Branch (MSAB) to support emissions inventory development.

On-Road (EMFAC)	Off-Road Models	Conferences

Events	Presentations
Onboard Sensing, Analysis, and Reporting (OSAR) Conference hosted by the University of California Riverside (UCR) College of Engineering, Center for Environmental Research and Technology (CE-CERT) - March 14 & 15, 2024	Lawnmower Emissions – PEMS Pilot Testing and Upcoming Surveillance Program
34^th Coordinating Research Council (CRC) Real World Emissions Workshop - March 2024	Air Quality Impacts of Port Congestion During the COVID - 19 Era and the Influence of Clean Transportation Policies Improving Energy Consumption Rate Estimates for Zero Emission Vehicles in EMFAC202Y Developing a Statewide Aircraft Emissions Inventory New NOx Emission Factors for Off-road Diesel Engines Approaches for Using Portable Emissions Measurement System (PEMS) Data for On - Road Heavy - Duty Vehicle Inventory Development
AGU2023 Fall Meeting - December 2023	Investigating the Impact of Port Congestion on Air Pollutant and Greenhouse Gas Emissions from Operations of the Ports of Los Angeles and Long Beach: Insights from the COVID-19 Era and the Influence of Policies
Symposium of California Air Pollution Control Officers Association (CAPCOA)Planning Managers Committee - November 2023	Accounting for Zero-Emission Vehicle (ZEV) Adoption in California’s On-Road Mobile Source Emissions Inventory (EMFAC) – 11/08/2023
Onboard Sensing, Analysis, and Reporting (OSAR) Conference hosted by the University of California Riverside (UCR) College of Engineering, Center for Environmental Research and Technology (CE-CERT) - March 2023	The Expanding Role of PEMS and On-Board Sensors in Mobile Source Emission Inventory Development - 03/30/2023
Coordinating Research Council (CRC) Real World Emissions Workshop - March 2023	Future EMFAC Development: Higher Spatial Resolution Emission Inventory - 03/28/2023 Application of Automated License Plate Readers (ALPR) for Fleet Characterization and Emissions Inventory - 03/28/2023 Potential Emission Benefits of Zero Emission Technology Adoption Scenarios in Off-Road Equipment - 03/28/2023 Applying Real-World Heavy-Duty Emissions Data to Inform Inventory Development - 03/28/2023

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Mobile Source Emissions Inventory Support

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Conferences and Workshops - Off-Road Models

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This page lists the public workshops and webinars hosted by the Mobile Source Analysis Branch (MSAB) in support of the OFF-ROAD emissions inventory development.

On-Road (EMFAC)	Off-Road Models	Conferences

April 2026 Public Workshop for Recreational Marine Vessel (RMV2026) Emissions Inventory Model	Webcast - 4/24/26 Workshop Presentation - 4/1/26 Workshop Announcement - 3/13/26
July 2025 Public Workshop for Updates to the Transport Refrigeration Unit (TRU) Emissions Inventory Model	Webcast - 7/9/25 Workshop Presentation - 5/8/25 Workshop Announcement - 6/12/25
December 2024 Public Workshop for Draft Ocean-Going Vessels Emissions Inventory Model	Webcast - 12/12/24 Workshop Presentation - 11/26/24 Workshop Announcement - 11/15/24
October 2024 Public Workshop for the Development of the 2024 California Aircraft Emissions Inventory Model (CAI2024)	Webcast - 10/30/24 CAI2024 Model Technical Documentation and Appendices - 10/24/24 Workshop Presentation - 10/23/24 Workshop Announcement - 9/24/24
October 2023 Second Public Workshop for Tier 5 Rulemaking Inventory on Preliminary Off-Road Diesel Emission Factor Updates	Webcast - 11/3/23 Workshop Presentation - 10/31/23 Workshop Announcement - 10/9/23
January 2023 Second Public Workshop for Large-Spark Ignition Forklift Emissions Inventory	Webcast - 1/24/23 Workshop Presentation - 1/19/23 Workshop Announcement - 12/23/22
April 2022 Public Workshop for Large-Spark Ignition Equipment Emissions Inventory	Webcast - 4/27/22 Workshop Presentation - 4/26/22 Workshop Announcement - 4/6/22
September 2021 Public Workshop for Cargo Handling Equipment and Ocean-Going Vessels Emissions Inventories	Webcast - 9/27/21 Workshop Presentation - 9/21/21 Workshop Announcement - 9/20/21
March 2021 Public Workshop for the Development of the California Recreational Marine Vessel Emissions Inventory	Workshop Presentation - 3/27/21 Workshop Announcement - 3/4/21
September 2020 Public Workshop for Locomotive Emission Inventory	Workshop Presentation - 9/2/20 Workshop Announcement - 9/2/20
April 2020 SORE2020 Model Webinar - Q&A	Webinar Announcement - 3/28/20 Updated Workshop Presentation - 3/30/20 Webcast - 4/15/20
March 2020 Public Workshop for SORE2020 Model	Updated: Workshop Announcement - 3/16/20 Presentation - 3/24/20 Webcast - 3/26/20 Q&As - 3/27/20

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Off-Road Mobile Source Emissions Inventory Support

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Conferences and Workshops - On-Road (EMFAC)

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This page lists the public workshops and webinars hosted by the Mobile Source Analysis Branch (MSAB) in support of the ON-ROAD emissions inventory development (EMFAC).

On-Road (EMFAC)	Off-Road Models	Conferences

April 30, 2025 Public Workshop for the EMFAC202Y (EMFAC2025) Model	Webcast - 4/29/2025 Workshop Presentation - 4/29/2025 Workshop Announcement - 4/15/2025
October 23, 2024 Public Workshop to Discuss Updates to CARB's EMFAC202Y (EMFAC2025) Model	Webcast - 10/23/24 Workshop Presentation - 10/23/24 Workshop Announcement - 9/25/24
January 17, 2024 Public Workshop for the EMFAC202Y (EMFAC2025) Model	Webcast - 1/17/24 Workshop Presentation - 1/17/24 Workshop Announcement - 12/1/23
October 2022 Public Workshop for the EMFAC202Y (EMFAC2025) Model	Webcast - 10/13/22 Workshop Presentation - 10/12/22 Workshop Announcement - 9/19/22
December 2020 Public Workshop on the EMFAC202x (EMFAC2021) Model	Workshop Presentation - 12/14/20 Workshop Announcement - 12/14/20
July 2020 Public Workshop on the EMFAC202x (EMFAC2021) Model	Webcast - 8/24/20 Workshop Presentation - 7/28/20 Workshop Announcement - 6/24/20
October 2019 Public Workshop on the EMFAC202x (EMFAC2021) Model	Workshop Announcement - 9/9/19 Presentation - 10/01/19
June 2017 Public Webinar Workshop on Updates to CARB'S EMFAC2017 Model	Workshop Announcement - 6/1/17 Presentation
June 2015 EMFAC2014 Online Training Webinar	Public Notification - 6/4/15 Presentation Webcast Part 1: Introduction Webcast Part 2: Major Model Changes Webcast Part 3: Project Type Guidance Webcast Part 4: Model Installation and Default Activity Emissions Mode Webcast Part 5: Custom Activity Emissions Mode Webcast Part 6: Project Level Assessment Webcast Part 7: EMFAC Web Database

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Mobile Source Emissions Inventory Support

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Conferences and Workshops - Main Page

This page lists the public workshops and webinars hosted by the Mobile Source Analysis Branch (MSAB), in support for all emissions inventory development.