Medium- and Heavy-Duty Diesel Regulations
Truck & Bus
Diesel trucks and buses with a gross vehicle weight rating(GVWR) that are greater than 14,000 pounds (lbs), must reduce exhaust emissions by meeting particulate matter (PM) filter requirements and upgrading to a 2010 or newer engine model year (EMY).
Transport Refrigeration Unit (TRU)
On February 24, 2022, CARB approved amendments to the TRU ATCM (2022 Amendments) to achieve additional emission and health risk reductions from diesel-powered TRUs and increase the use of zero‑emission technology in the off-road sector.
Owners of 53-foot or longer box-type trailers including both dry-van and refrigerated-van trailers, and owners of the heavy-duty tractors that pull them on California highways must meet specific requirements.
Learn about multiple diesel regulations pertaining to off-road vehicles and equipment.
The Solid Waste Collection Vehicle (SWCV) regulation was adopted by the Board in 2004. All SWCVs, except for certain low-use vehicles, were required to have particulate matter (PM) filters installed by December 31, 2010. In January 2019, the Board approved amendments to the SWCV regulation.
Clean Truck Check (HD I/M)
In December of 2021, CARB approved for adoption the HD I/M program in an ongoing effort to meet air quality standards by ensuring heavy-duty vehicle emissions control systems are properly operating throughout the life of the vehicle. The program sets regular testing requirements for all non-gasoline heavy-duty trucks operating in the State and will be tied to DMV registration.
Zero-Emission Vehicle Regulations
In recent years CARB has begun developing and adopting zero-emission vehicle (ZEV) regulations.
Portable Equipment Registration Program (PERP)
Owners or Operators of portable engines and other types of equipment can register their units under the CARB Statewide Portable Equipment Registration Program (PERP) in order to operate their equipment throughout California without having to obtain individual permits from local air districts.
Cargo Handling Equipment
Mobile cargo handling equipment is any motorized vehicle used to handle cargo or perform routine maintenance activities at California’s ports and intermodal rail yards. The type of equipment includes yard trucks (hostlers), rubber-tired gantry cranes, container handlers, forklifts, etc.