top of page


FARMER program

Image by Tim Foster

The California Air Resources Board is making $135 million available under its Funding Agricultural Replacement Measures for Emission Reductions program.

The California Air Resources Board is making $135 million available under its Funding Agricultural Replacement Measures for Emission Reductions, or FARMER, program. The funds available through the FARMER program provide significant assistance to California farmers who face the most stringent air quality requirements in the nation. Farmers can apply to their local air districts to receive funding for voluntary agricultural vehicle and engine replacements.

The FARMER program provides funding for:

  • Heavy-duty truck replacements

  • Mobile off-road farm equipment replacements

  • Agricultural irrigation pump replacements

  • Zero-emission agricultural all-terrain vehicles (ATVs)

  • Off-Road Mobile Agricultural Equipment Trade-Up Pilot Project (only available in the San Joaquin Valley)


For more information or to apply for funds contact your local air district.

diesel regulations

Image by Zetong Li

Air Quality – Stationary Ag Engine Rule Information


An in-use stationary diesel agricultural engine (also referred to as in-use ag. engine) is a diesel-fueled engine located at a fixed site for the purposes of growing crops or raising fowl or other animals. Most are used to power irrigation pumps. They may also be used to power agricultural wind machines and to generate power for other agricultural purposes during electrical power failures or in remote locations

At a public hearing on October 21, 2010, the California Air Resources Board approved in-use ag. engine emission and other requirements as part of the amended Airborne Toxic Control Measure for Stationary Compression Ignition Engines (title 17, California Code of Regulations, sections 93115.1 through 93115.15) (Stationary Diesel Engine ATCM). The amendments became effective on May 19, 2011, and the Final Regulation is available at:

Diesel Truck Regulations

The Truck and Bus regulation has been in effect since December 2008 and we are now in the last replacement phase of the regulation with a final deadline of January 1, 2023, to upgrade to 2010 or newer model year engines. Please submit any compliance documentation by emailing a scanned copy or photos of your documents to Include your TRUCRS ID number, a detailed description of the request, and list any applicable VIN(s). Please do not mail hard copy documentation unless requested by staff. Faxing of documentation is no longer available.

Diesel truck operators should be meeting basic engine model year requirements.  To report information to the Air Resources Board you may visit the Truck Regulation Compliance Reporting System by clicking

tractor rule

Image by Heiko Janowski

In-Use Off-Road Mobile Agricultural Equipment Regulation

The Funding Agricultural Replacement Measures for Emission Reductions (FARMER) Program provides funding through local air districts for agricultural harvesting equipment, heavy-duty trucks, agricultural pump engines, tractors, and other equipment used in agricultural operations.

FARMER Program

In 2007, California Air Resources Board committed to developing a control measure to reduce emissions from in-use self-propelled off-road mobile agricultural equipment. 

The 2007 San Joaquin Valley 8-Hour Ozone State Implementation Plan (SIP), approved by U.S. Environmental Protection Agency (U.S. EPA), contained a commitment for the Air Resources Board (ARB or Board) staff to present to the Board in 2013 a regulation for mobile agricultural equipment that moves California towards meeting ambient air quality standards for the San Joaquin Valley by utilizing the cleanest available technologies.  In October 2013, the Board approved the State Implementation Plan Credit from Mobile Agricultural Equipment Regulation which provides the administrative mechanism for emission reductions resulting from mobile agricultural equipment program projects funded by the Carl Moyer Program to be eligible for SIP credit.  This regulation complements the San Joaquin Valley Air Pollution Control District's Rule 9610 that will ensure emission reductions achieved through local, State, and federal voluntary incentive programs from mobile agricultural equipment projects are eligible for SIP credit.  


In October 2018, the Board adopted the San Joaquin Valley Supplement to the 2016 State Strategy for the State Implementation Plan (Valley State SIP Strategy) describing measures and emission reductions necessary to attain health-based federal air quality standards for PM 2.5 in the San Joaquin Valley.  The Valley State SIP Strategy includes measures that will rely on the deployment of the cleanest technologies in the mobile agricultural equipment sector through a combination of incentives and regulation.  CARB is working to gain a better understanding of the agricultural sector and how mobile agricultural equipment is used in California through efforts such as surveys of agricultural producers, first processors, and custom operators to update the mobile source emissions inventory.  


In December 2019, the Board approved the San Joaquin Valley Agricultural Equipment Incentive Measure (Valley Incentive Measure).  The Valley Incentive Measure establishes procedures for ensuring emission reductions achieved through incentive programs can be credited toward meeting the 2024 and 2025 commitments in the Valley State SIP Strategy.  More Information 

bottom of page