While no specific tax increase is taking effect in California, at least two state lawmakers are raising alarm about a set of regulatory and business circumstances that could send pricing soaring.

Stellantis NV, owner of the Jeep and Ram brands, is petitioning against emissions standards adopted by California and 13 other states that it says give competitors unfair advantages.

An 18-state coalition is backing the EPA in a legal action supporting California’s future strict emissions controls on medium- and heavy-duty trucks.

California’s Air Resources Board voted April 27 to approve a rule that would ban the use of locomotive engines more than 23 years old by 2030 and increase the use of zero-emission tech at ports and railyards.

General Motors said it will recognize California’s authority to set vehicle emission standards under the Clean Air Act.

Peterbilt and Kenworth separately announced California customers for their medium-duty battery-electric trucks are eligible for a $95,000 voucher from the California Air Resources Board.

California’s South Coast Air Quality Management District has approved the first installment of $27 million in a program that ultimately will provide up to $90 million to replace higher-polluting Class 8 trucks and port drayage trucks with zero-emission vehicles.

California regulators already have issued a proposal aimed at lowering oxides of nitrogen and particulate matter emissions for new trucks built beginning in 2024, but federal regulators are still working to craft a separate nationwide low-NOx and PM proposal scheduled to take effect in 2027.

California environmental regulators approved a measure that within a few years will require truck manufacturers to transition a percentage of their sales in the state from diesel trucks to electric zero-emission vehicles.

The California Air Resources Board has conditionally approved a slate of regulatory amendments intended to more closely monitor the additives blended into B20 biodiesel that so far have not been deemed effective at mitigating oxides of nitrogen in the alternative diesel fuel.