as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
research the regulations for motor vehicle emission standards in california.
user
the california clean truck, bus and off-road regulation (formally known as the truck and bus regulation) is the state's 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.
assistant