Wednesday, 08 February 2023

State passes regulation for stationary ag diesel engines

LAKE COUNTY – A workshop on the requirements of the Air Toxic Control Measure for Stationary CI Engines used in agricultural operations and the approach to implement the program in Lake County will be held this month.

The Lake County Air Quality Management District, Lake County Farm Bureau, the Lake County Winegrape Commission and other interested parties will hold the workshop on Dec. 14 at 10 a.m., at the agricultural center conference room.

Tiny particles in diesel engine exhaust have increasingly been regulated by the state as a cancer-causing health risk. The Lake County Air Quality Management District is required to enforce the Air Toxic Control Measures (ATCM) enacted by the CARB for all stationary sources within the Lake County air basin.

CARB recently amended the ATCM to require Stationary Agricultural Compression Ignition Engines (engines using diesel or similar fuel) to be permitted / registered in local air districts statewide. The changes will implement a regulation to control particulate and nitrogen oxide emissions from stationary agricultural diesel engines (not tractors or other motive powered equipment).

All stationary engines larger than 50 horsepower are required to be permitted by the LCAQMD by March 1, 2008. Full compliance with the various emission requirements will be phased in over several years, starting on January 1, 2011, but requirements are already in effect for engines purchased or installed after January 1, 2005.

The requirements will apply to most stationary agricultural diesel engines now in use, although most were previously unregulated. Some engine use may be exempt from the emissions reduction requirements, but still must be permitted by the LCAQMD, and their use reported annually.

Engines that do not meet the new requirements must be upgraded to conform or be replaced with compliant equipment. Upgrade options include replacement with electrical service motor/engines, add-on particulate control devices, newer cleaner diesel engines, or gasoline or propane spark-ignition engines.

The CARB has estimated that 21 to 29 affected engines exist in Lake County. Further constraints may apply if the engine is located within 1,000 feet of a school or hospital.

Currently there are no state regulations that place requirements on agricultural tractors, spray rigs, harvesters, or other mobile farm equipment.

Further information about the new ATCM requirements is available by contacting Barbara Cook of the CARB at (916) 323-0440 or This email address is being protected from spambots. You need JavaScript enabled to view it..

A fact sheet is available on the Web at


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