September 3, 2020

03 September 2020

California NOx Omnibus Regulation Requires 90 Percent NOx Reduction by 2027

On August 27, 2020, the California Air Resources Board (CARB) approved the Heavy-Duty Low NOx Omnibus Regulation (Omnibus Regulation), which requires heavy-duty truck manufacturers to achieve stringent nitrogen oxide (NOx) emission standards. The Omnibus Regulation follows the board’s June 2020 approval of the Advanced Clean Trucks regulation, which requires medium- and heavy-duty truck manufacturers to increase the sales of zero-emission models. Both rules require that certain compliance milestones be met by 2024.