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Community-Focused Event: An Introduction to Transport Refrigeration Units and California Air Resources Board’s Regulation Process – Interactive and Informative Session
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Rulemaking Documents

Below you will find links to the rulemaking documents for the In-Use Off-Road Diesel-Fueled Fleets Regulation corresponding to the appropriate year changes were adopted.

November 2022
Phase out of the oldest and highest-emitting off-road engines from operation, restrict the addition of vehicles with Tier 3 and 4i engines, require contracting entities to obtain and retain a fleet's valid Certificate of Reported Compliance prior to awarding a contract or hiring a fleet, mandate the use of R99 or R100 Renewable Diesel for all fleets, provide voluntary compliance flexibility options for fleets that adopt zero-emission technology, and include additional requirements to increase enforceability, provide clarity, and provide additional flexibility for permanent low-use vehicles. 
December 2010 AmendmentsDelayed the initial compliance date for all fleets by four years, provided a path to compliance without any required retrofits, and simplify the regulation.
July 2009 AmendmentsAmendments were approved to provide additional incentives to spur early actions by fleets to reduce emissions, and to make several minor clarifications to the regulation.
January 2009 AmendmentsExtended the deadline for receiving double credits for early installation of particulate matter retrofits, modify the changing-fleet-size requirements, clarify all sellers of off-road vehicles must maintain records of the disclosure of applicability.
Original RegulationRegulation adopted to reduce emission of diesel particulate matter and oxides of nitrogen from in-use off-road diesel vehicles operating in California.

Opportunities to Address Past Inequity to Build Healthier, More Sustainable Communities

Principal Investigator/Authors: Charisma Acey, Margaretta Lin                 

Contractors: University of California, Berkeley

Sub-contractors: Just Cities and West Oakland Environmental Indicators Project

Contract number: 21RD009

Project Status: Active

Relevant CARB programs: Sustainable Communities & Climate Protection ProgramResearch Planning

Topic areas: Sustainable Communities, Research & Sustainable CommunitiesSustainable Community Strategies (SCS)Vehicle Miles Traveled (VMT) Reduction & Climate GoalsLand Use & Transportation Research


Research Summary:

This project will examine public investment policies and systemic precedents that contribute to the inequitable distribution of resources and resulting disparities across California communities. The project will identify opportunities and potential resources to address these inequities in public infrastructure investment policies and practices in the housing, land use, and transportation sectors. The project findings and resulting report, will identify and prioritize equitable policies that also contribute to reductions in vehicle miles traveled (VMT) and greenhouse gas (GHG) emissions, and preserve, protect, and allow to produce more affordable housing across the state. In addition to offering opportunities to identify how existing and new public investments can be utilized to yield economic, environmental, and social returns to support healthy and more sustainable community development.

The project will develop an online policy mapping tool with multiple resources to support local decision-makers and advocates in preventing current and future harm for people of color and other vulnerable populations as well as reduction in VMT and GHG emissions. The mapping tool will share a research action model to help users identify local conditions and impact (environmental, health, housing, transportation) to understand their connection to inequitable policies and practices in their selected regions. In addition, the tool will include six unique case studies cataloguing history of policies and impacts (drivers of pollution and inequity), existing solutions, and visionary solutions proposed by communities. Moreover, the mapping tool will feature a database of equitable and inequitable investment policies, practices, and strategies across California that have prevented or created harm in distinct geographies. All tools will be developed through a transformative planning process alongside an Environmental Justice Advisory Council.


Keywords: sustainable community strategies (SCS); transportation and land use; equitable climate policy; evaluation methods

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Project Background for Financing Assistance for Lower-Income Consumers Program

Project Goals

The Financing Assistance Program is one of CARB's suite of equity projects that provides financial resources to help lower-income Californians purchase advanced clean vehicles. The project offers vehicle price buy-downs (grants) at the point of sale, guarantees fair financing through lower-interest loans, and provides home charger incentives or portable chargers and prepaid charge cards where there are home charger installation barriers.

Guiding Legislation/Policy Drivers

Senate Bill (SB) 1275 directs CARB to establish financing assistance projects for lower-income consumers. This project supports the statutory goals of SB 1275 and SB 350 recommendations by prioritizing funds for clean transportation and mobility options. This is accomplished by implementing programs that expand the new and used vehicle ownership programs with point-of sale incentives (price buy-downs) and low-cost loans; increasing awareness of clean transportation and mobility options by educating consumers of clean transportation options and infrastructure investments; and incentivizing charging infrastructure for lower-income residents.

Project Funding/Allocations History

A table of Funding Amounts listed by Fiscal and Funding Categories
Fiscal YearBSF (millions)CHDC (millions)From GGRF (millions)From VW (millions)
FY 2016-17$5$0.9$5.90--
FY 2017-18$18$2$10$10
FY 2018-19$6$4$10--
FY 2019-20$7.842$0.118$7.96--
FY 2020-21$0$0$0--
FY 2021-22*$8$1$23.5--
FY 2022-23*----$66--

*The $14.5 million remaining from the FY 2021-22 allocation was added to the solicitation for the new statewide Financing Assistance program that will replace the Clean Vehicle Assistance Program and the Driving Clean Assistance Program. Funding allocated in FY 2022-23 will also be used to fund the new statewide Financing Assistance Program for a total of $80.5 million allocated for the future program. A solicitation for a grantee to administer this program was released in February 2023 and the program is expected to launch by the end of 2023.

Funding Breakdown

A breakdown of program expenditures.
Total Grant AmountAdministration & OutreachIncentives

Recent Project/Policy Changes

  • Transitioning from a first-come, first-serve model to a need-based approach where consumers with certain criteria will be prioritized in application processing and assistance.
  • Applied purchase price cap of $45,000

Project Info/Reports

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1997 Board Resolutions

Resolutions are a document the Board uses to vote on a proposed action. After the Board approves a resolution, it will be posted within two weeks after the Board meeting.

Resolution NumberItemHearing Date
97-1SCAQMD '97 PLAN January 23, 1997


Proposal No. 2233-196, "Determination of the Horizontal Diffusion Coefficient for Use in the SARMAP Air Quality Model" EARTH TECH Inc. $94,352 January 23, 1997
97-3Proposal No. 2310-197, "Aircraft Sampling to Determine Atmospheric Concentrations & Size Distributions of Particulate Matter & Other Pollutants over the SC Air Basin" CA Inst. of Technology $199,663 January 23, 1997
97-4Proposal No. 2318-197, "Development of Modeling Tools for Microscale Emissions Modeling" CA Polytechnic Univ., San Luis Obispo $179,547January 23, 1997
97-5Proposal No. 2301-197, "Heavy-Duty Vehicle Fleet Characterization for Reduction ofNox and Particulate Matter Emissions in the SC Air Basin" Jack Faucett Assoc. $197,389 January 23, 1997
97-6Proposal No. 2311-197, "Enhancement of the Existing Radar Wind Profiler Network for the 1997 So. CA Ozone Study" Radian International LLC $394,947 January 23, 1997
97-7Proposal No. 2237-196, "Improving the Accuracy of Mixing Depth Predictions from the Mesoscale Meteoroligical Model MM5" MCNC-Environmental Programs $92,481 January 23, 1997
97-8 Proposal No. 2315-197, "Audit of the Radar Wind Profiler Network and Selected Surface Meteorological Sites for the 1997 So. CA Ozone Study" AeroVironment Enviro Svcs $109,994 January 23, 1997
97-9Proposal No. 2303-197, "Automatic Charging System for Electric Vehicles: Demo Project" Bevilacqua Knight, Inc $483,650 January 23, 1997
97-10Proposal No. 2314-197,"Surface and Upper-Air voe Sampling and Analysis Durning the 1997 So CA Ozone Study" UC Riverside $249,166 January 23, 1997
97-11Proposal No. 2316-197, "Management of Data from the Upper-Air Meteorological Network for the 1997 So CA Ozone Study" System Demon & Integration Division in the Enviro Technology Lab under the Enviro Research Lab of the National Oceanic & Atmos Admin 
January 23, 1997
97-12Proposal No. 2305-197, "An Assessment of the Effectiveness of Room Enclosures w/ Ventilation Systems in Reducing Risk at Dry Cleaning Facilities Using Perch" AeroVironment Envir Svcs, Inc $130,477 January 23, 1997
97-13Proposal No. 2283-196, "Identification of Point Source Emissions Controls and Determination of their Efficiencies and Costs" E.H. Pechan & Assoc, Inc 
January 23, 1997
97-14Hairspray Amendments March 27, 1997
97-15LPGPropene March 27, 1997
97-16Portable Equip. Regis. Program March 27, 1997
97-17ID Inorganic Lead as a TAC April 24, 1997
97-18James Strock April 24, 1997
97-19Interchangeable Emission Reduction Credits May 22, 1997
97-20Enhanced Evap Reg May 22, 1997
97-21Proposal No. 2326-198, "Heavy-Duty Vehicle Chassis Dynamometer Testing for Emissions Inventory" CA Truck Testing Services $803,715May 22, 1997
97-22Proposal No. 2321-198, "Incorporation of Radio Transponders into Vehicle On- Board Diagnostic Systems" Sierra Research Inc. $299,706May 22, 1997
97-23Proposal No. 2322-198, "Development of Toxics Emissions Factors from Source Test Data Collected Under the Air Toxics Hot Spots Program-Part II" Energy and Environmental Research Corp. $149,885 May 22, 1997
97-24Proposal No. 2331-198, "Demonstration of a Diesel-Fuel-Borne Catalyst System and Low-NOx Control Technology for Reducing Particulate and Nox Emissions" SCAQMD $275,00 May 22, 1997
97-25Proposal No. 2329-198, "Review and Improvement of Methods for Estimating Rates of Photolysis in Photochemical Models" UC Berkeley $182,302May 22, 1997
97-26Proposal No. 2330-I 98, "Evaluation of Factors that Affect Diesel Exhaust Toxicity" UC Riverside $102,458May 22, 1997
97-27Proposal No. 2233-196, "Determination of the Horizontal Diffusion Coefficient for Use in the SARMAP Air Quality Model" EARTH TECH Inc. $94,352 May 22, 1997
97-28SJ VALLEY PMI O PLANJune 26, 1997
97-29ICAT Proposal No. 96-01-01 "Hybrid- Electric Prototype Truck {HEPT)" ISE Research, Inc. $350,000June 26, 1997
97-30ICAT Proposal No.96-01-06 "Low Combustion Gas Turbine Field Demonstration" Catalytica  Combustion Systems, Inc $325,000June 26, 1997
97-31ICAT Proposal No. 96-01-10 "Radial and Thrust Gas Bearing for Fuel Cell Turbocharger" Meruit, Inc. $136,000June 26, 1997
97-32ICAT Proposal No.96-01-11
"Application Demonstration for Dual Stage Biofilter for Publicly Owned Treatment Works (POTW's)" Reynolds Group $142,500
June 26, 1997
97-33Proposal No. 2333-199, "Air Monitoring Program for Determination of the Impacts of the Introduction of California's Phase 2 Reformulated Gasoline on Ambient Air Quality in the South Coast Air Basin," Desert Research Institute $206,445June 26, 1997
97-34Off-Cycle EmissionsJuly 24, 1997
97-35Research Plan 1997 UpdateJuly 24, 1997
97-36Proposal No. 2211-191, "Development of Laser Desorption Laser Photoionization Mass Spectrometry Method for the Screening of Nitro- Substituted Polycyclic Hydrocarbons, Chlorianted Dibenzodioxins, and Chlorinated Dibenzofurans" UC Davis$29,539July 24, 1997
97-37Consumer Products RegJuly 24, 1997
97-38Patricia HilligossSeptember 25, 1997
97-39Pollution Prevention WeekSeptember 25, 1997
97-40ETS ReportOctober 23, 1997
97-41Hot Spots Fee Regs. November 13, 1997
97-42Hairspray Credit Program November 13, 1997
97-43Area Designations November 13, 1997
97-44HD Vehicle Inspect/HD Perodic Smoke Inpection Program December 11, 1997
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Data Analysis of Organics and Other Sources (Volatile Chemical Products) in the California South Coast Air Basin

Principal Investigator/Author: John Seinfeld

Contractor: California Institute of Technology

Contract number: 22RD015

Relevant CARB programs: California State Implementation Plans

Topic areas: Air Pollution Exposure, State Implementation Plans (SIPs), Particulate Matter (PM), PM2.5, Emissions Data


Research Summary:

Caltech researchers are investigating air quality in the South Coast Air Basin, focusing on understanding the impact of a special type of chemicals called volatile chemical products. They are using field measurements, lab experiments, and computer models to analyze data collected during a 2021 research campaign. By identifying and studying these chemicals, they aim to grasp their effects on air pollution and contribute to cleaner air in California.


Keywords: PM2.5, secondary organic aerosols, volatile chemical products, air quality, emission sources, state implementation plans, source apportionment, air quality trend

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LCTI: Our Community, Our Shuttle

Sustainable Transportation Equity Project (STEP) Implementation Grant

San Francisco Municipal Transportation Agency (SFMTA) | Our Community, Our Shuttle: Bayview-Hunters Point Equitable Mobility 

SFMTA logo

June 2022 – March 2026

Project Details

Our Community, Our Shuttle includes a zero-emission, on-demand, and dynamic shuttle service in the Bayview Hunters Point neighborhood. SFMTA will augment this new shuttle service, working with partners to: install a series of pedestrian and transit safety and accessibility improvements identified through the Bayview Community-based Transportation Plan, recruit and train shuttle drivers from within the community in coordination with the CityDrive workforce program, and run a transportation resource center to answer transportation-related questions and connect residents with transportation services and subsidies. All project elements will include extensive outreach and public engagement, including oversight from a Community Congress.

A map of Bayview Hunters Point neighborhood within San Francisco. The solid line represents the project area.
Project Area Map, Bayview Hunters Point neighborhood of San Francisco

Funding Details

Grant Amount: $10,569,100

Resource Contributions: $3,477,200

Project Total: $14,046,300

By the Numbers

Services, Vehicles & Equipment Funded

  • 6 zero-emission shuttles
  • About 50 community engagement events planned
  • 5.6 miles of bike lane/sidewalks
  • Up to 9 pedestrian bulb-out projects
  • 2 quick-build active transportation projects
  • Shuttle driver trainings completed for 20-30 participants annually
  • 0.6 full-time equivalent Transportation Liaison at the Transportation Resource Center
  • 6 Transportation Resource Center Youth Champions supporting the Transportation Resource Center
  • 10 Community Congress meetings, convening 15 community delegates

Estimated Quantifiable Benefits

  • GHG emission reductions: 473 MTCO2e
  • NOx reductions: 143 lbs
  • PM2.5 reductions: 31 lbs
  • ROG reductions: 36 lbs
  • Passenger VMT reductions: 1,759,709 miles
  • Travel cost savings: $800,668
  • Transportation fossil fuel reductions:​ 35,450 gallons
  • Direct Jobs: 127
  • Indirect Jobs: 24
  • Induced Jobs: 40

    Community event participants and project team  Bike event ride

    Bike community event     Community event for mobility planning

    Community Details

    The project focuses on the Bayview-Hunters Point neighborhood of San Francisco. Bayview-Hunters Point is a resilient and culturally rich community in the southeast of San Francisco with a long history of successful environmental justice advocacy. One of the historical centers of the City’s African American community, Bayview is now a majority Asian, African American, and Hispanic/Latinx community with a high percentage of limited English speakers. Almost half of residents live below 200% of the federal poverty level, with a high concentration of very low-income households in redeveloped public housing, or HOPESF sites, that are in geographically isolated areas and have limited access to the city’s Muni transportation system. 21% of residents do not own a car, with the highest concentrations of car-free households in HOPESF housing. 3.4 miles of streets in the STEP Community are designated on the City's High Injury Network; almost all of these high-injury streets are located on major transit corridors with critical community destinations or in close proximity to HOPESF affordable housing sites.

    Demographics of Community Served by Project

    36% Asian, 26% Black or African American, 24% Hispanic/Latino, 9% White, Other 8%
    Median Household Income: $56,724

    Community Benefits

    This project intends to co-create services that directly address mobility gaps for Bayview-Hunters Point residents, paving the way for an equitable transportation network. The project will take a people-first approach that is restorative and embedded within community context and culture, intended to:

    • Increase mobility and choice for those most vulnerable to transportation challenges
    • Generate holistic environmental and socio-economic benefits through the provision of sustainable and accessible zero-emissions transportation alternatives, reduced greenhouse gas emissions, and greater access to critical community-serving destinations
    • Seek to repair harm, incorporate restorative measures, and utilize lessons from the past to design a better future
    • Deliver culturally relevant solutions that are embedded within community context 
    • Center community decision-making and ownership of data
    • Ensure investment and accountability from local leadership that parallels community contributions

      Outreach & Engagement Strategies

      • Surveys
      • Pop-up events
      • Focus groups
      • Project demonstrations
      • Community meetings
      • Work groups
      • Flyers and brochures 

      Target Populations

      • Youth
      • Seniors
      • Residents with a disability
      • Residents with limited English proficiency
      • Residents in affordable housing

      Partnership Structure


      The San Francisco Municipal Transportation Agency (SFMTA) is a department of the City and County of San Francisco responsible for the management of all ground transportation in the city. The SFMTA has oversight over the Municipal Railway (Muni) public transit, as well as bicycling, paratransit, parking, traffic, walking, and taxis, creating transportation options that are constant, practical and everywhere and connecting people with their community to enhance the economy, environment and quality of life.


      Community Partners


      Robert Lim | (415) 646-2403 | SFMTA

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      LCFS Fuel Pathways Public Comments

      This is a comment submission form for Low Carbon Fuel Standard (LCFS) fuel pathway applications that require public comments. Please note that your written and oral comments, attachments, and associated contact information (e.g., address, phone, email, etc.) become part of the viewable public record. Additionally, this information may become available via search engines.

      Instructions for Submitting a Comment

      For Temporary and Lookup Table Pathways:

      1. View the pathway documentation by selecting the pathway description.
      2. In the comment Subject line, include the pathway description. For example, "Comments for CA grid electricity used in Smart Charging or Smart Electrolysis". 

      For Tier 2 Pathways:

      1. View the application package by selecting the Application Number (i.e., "B0008").
      2. In the comment Subject line, please include the specific application number. For example, "Comments for application no. B0008". 

      For each posted item, comments are due at 5 PM PST on the deadline shown.

      (This form will remain open for the "Deadline for Submittals" period shown below).


      Comment Section
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      Public Comment on Application for Variance from the Prohibitions on Use of Certain Hydrofluorocarbons in Stationary Refrigeration, Stationary Air-Conditioning, and Other End-Uses (Cal. Code of Regs., tit. 17, § 95371 et seq.)

      Variance Applicant: LG Electronics Inc. (LG)

      The California Air Resources Board (CARB) invites interested parties to submit comments on LG's application for a variance. All comments will be publicly accessible via this docket to support an inclusive and transparent process.

      LG submitted an application, pursuant to section 95378 of the HFC Regulation, for a variance from the requirements of section 95374(c). Specifically, section 95374(c) prohibits the use of HFCs with a GWP of 750 or greater in new residential dehumidifiers. LG is requesting an impossibility variance to continue the use of R-410A until June 2024.

      A copy of the variance application is available on CARB’s website at []. Please contact the HFC team if you have any questions or concerns:

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