"The California Clean Truck, Bus and Off-Road Regulation (formally known as the Truck and Bus Regulation) is the states existing motor vehicle emissions standard for trucks, buses, and certain off-road vehicles. The rule sets limits on harmful emissions such as nitrogen oxides (NOx) and particulate matter (PM) emissions from these vehicles, and requires that they use low-sulfur diesel fuel. The regulation also requires vehicle owners to perform annual inspections, maintain their vehicles, and demonstrate compliance with the regulation."
Research the regulations for motor vehicle emission standards in California.?