The California Air Resources Board (CARB) has adopted greenhouse gas (GHG) standards that largely align with the U.S. Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) GHG standards for new medium- and heavy-duty engines, vehicles, and trailers sold in California. The regulations will reduce GHG emissions from on-road medium- and heavy-duty vehicles.
More about this program
Rulemaking Documents - Phase 2
Learn more about the next generation of GHG standards for trucks and tractor-trailers, California’s Phase 2 standards, as well as amendments to CARB’s Tractor-Trailer GHG Regulation.