California Phase 1 Greenhouse Gas Standards
- Greenhouse Gas Standards for Medium- and Heavy-Duty Engines and Vehicles
- Meetings and Workshops
- CA Environmental Performance Label for Medium-Duty Vehicles
- CA Phase 2 GHG Trailer Certification
- CA Phase 2 GHG Standards
- CA Phase 2 Background Materials
- CA Phase 1 GHG Standards
- CA Phase 1 Background Materials
In 2013, California Air Resources Board (CARB) adopted a new regulation for greenhouse gas (GHG) emissions from heavy-duty trucks and engines sold in California. It establishes GHG emission limits on truck and engine manufacturers and harmonizes with the adopted U.S. Environmental Protection Agency (EPA) rule for new trucks and engines nationally. Existing heavy-duty vehicle regulations in California include engine criteria emission standards, tractor-trailer GHG requirements to implement Smartway strategies (i.e., the Heavy-Duty Tractor-Trailer Greenhouse Gas Regulation), and in-use fleet retrofit requirements such as the Truck and Bus Regulation. In September 2011, the U.S. EPA adopted their Phase 1 standards for heavy-duty trucks and engines. The U.S. EPA rule has compliance requirements for new compression and spark ignition engines, as well as trucks from Class 2b through Class 8. Compliance requirements begin with model year (MY) 2014 with stringency levels increasing through MY 2018. The rule organizes truck compliance into three groupings, which include: a) heavy-duty pickups and vans; b) vocational vehicles; and c) combination tractors. The U.S. EPA rule does not regulate trailers.
In 2016, U.S. EPA and NHTSA jointly adopted the federal Phase 2 standards that built on the Phase 1 standards and achieved additional GHG reductions. California aligned with these federal Phase 2 standards in 2018 (CA Phase 2).