The Truck and Bus Regulation applies to privately and federally owned diesel trucks and buses that operate in California.
Need help finding information about the State Air Resources Board (CARB) On-Road Truck Regulations? Telephone the CARB Hotline number: 866-634-3735 (866-6Diesel) and talk with a live person, or go on line at CARB website link The Truck Stop or The Truck and Bus Regulation Web page
Questions and Answers:
Fact sheets are available at https://ww3.arb.ca.gov/msprog/truckstop/azregs/outreach.htm. If you need help with reporting after reading the Online User Guide, please call or email the Diesel Hotline at 866-634-3735 or firstname.lastname@example.org or visit http://www.arb.ca.gov/dieseltruck for additional information.