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Transport Refrigeration Unit Amendments

January 27, 2023

In February 2022, the California Air Resources Board (CARB) adopted amendments to the Transport Refrigeration Unit (TRU) Airborne Toxic Control Measure (ATCM). Owners of TRUs will be required to report their California-operated TRU inventory, label TRU trucks, pay fees, and annually turn over at least 15% of TRU trucks to zero-emission (ZE) TRU trucks (see Table 1 for compliance dates).

Beginning December 31, 2022, newly manufactured TRUs must use refrigerant with a global warming potential (GWP) not exceeding 2,200. Beginning in 2023, newly manufactured TRUs must not exceed the particulate matter standard of 0.02 gram per brake horsepower-hour (Tier 4 for 25-50 hp engines). Manufacturers must also provide a comprehensive warranty for ZE TRU trucks.

Trailer TRUs must continue to meet the Ultra-Low Emission TRU (ULETRU) standards every 7 years.

CARB is assessing ZE options for non-truck TRUs and plans to propose a second rulemaking for potential adoption in 2025.

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