California regulators have unanimously approved a sweeping regulation that will lower oxides of nitrogen and particulate matter emissions for new trucks built beginning in 2024.

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.

Stakeholder comments on the Environmental Protection Agency’s plans to aggressively reduce oxides of nitrogen emissions generally were positive, but with some caveats.