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.