The Environmental Protection Agency is proposing its first new rules governing heavy-truck nitrogen oxide emissions in two decades, but engine manufacturers say the proposals would be difficult to meet and counterproductive because they could slow the move to cleaner technology.
May 9, 2022nox
Industry Leaders Raise Concern About Proposed EPA NOx Rule

Diesel Engine Makers Need to Innovate to Meet Stricter NOx Emission Standards

As state and federal clean-air regulators move forward with plans to further reduce nitrogen oxide and particulate matter emissions from commercial trucks, diesel engine makers are exploring new technologies to meet those targets in the coming years.
May 10, 2021Have EPA, CARB Reached Détente Over Emission Policy?
Almost since Donald Trump moved into the White House, the Environmental Protection Agency and California Air Resources Board have been in a political war over the direction of U.S. environmental policy. Can there be a thaw in the works now that EPA has announced plans to begin an “environmental review” to reduce nitrogen oxide emissions for heavy trucks?
November 29, 2018State, Local Agencies Petition EPA for National Truck Rule on NOx
With publication of the Phase 2 federal greenhouse-gas final rule for trucks expected soon, 12 agencies from state and local government have petitioned the Environmental Protection Agency to quickly produce a national rule that would tighten nitrogen-oxide emissions from trucks.
July 11, 2016California Pushes EPA to Lower NOx Limit as Part of GHG Rule for Heavy Trucks
California environmental regulators said they plan to begin development of tougher nitrogen oxide standards for heavy trucks, possibly as early as 2017.
October 12, 2015