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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 Amendments | 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 Amendments | Delayed 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 Amendments | Amendments 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 Amendments | Extended 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 Regulation | Regulation adopted to reduce emission of diesel particulate matter and oxides of nitrogen from in-use off-road diesel vehicles operating in California. |