https://www.dmv.ca.gov/portal/vehicle-registration/license-plates-decals-and-placards/clean-air-vehicle-decals-for-using-carpool-lanes/
Clean Air Vehicle Decals - California DMV
Oct 1, 2025 - If you drive a vehicle that meets certain emissions standards and other criteria, you may be able to get Clean Air Vehicle (CAV) decals and a CAV decal...
clean airvehicle decalscaliforniadmv