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
Government, Business, Technology, Equipment, Fuel 
Most OEMs, like Cummins, support stronger NOx requirements and efforts to reduce emissions eventually down to zero. (Cummins Inc.)
Industry Leaders Raise Concern About Proposed EPA NOx Rule
Most OEMs, like Cummins, support stronger NOx requirements and efforts to reduce emissions eventually down to zero. (Cummins Inc.) Government, Business, Technology, Equipment, Fuel 
A truck is being readied for testing of its emissions levels at the EPA emissions laboratory in Ann Arbor, Mich. (Environmental Protection Agency)
Diesel Engine Makers Need to Innovate to Meet Stricter NOx Emission Standards
A truck is being readied for testing of its emissions levels at the EPA emissions laboratory in Ann Arbor, Mich. (Environmental Protection Agency)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, 2021 Government, Business, Technology, Fuel 
Getty Images
Have EPA, CARB Reached Détente Over Emission Policy?
Getty ImagesAlmost 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, 2018 Government, Fuel 
iStock
State, Local Agencies Petition EPA for National Truck Rule on NOx
iStock 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, 2016 Government, Fuel 
Jamie Rector/Bloomberg News
California Pushes EPA to Lower NOx Limit as Part of GHG Rule for Heavy Trucks
Jamie Rector/Bloomberg NewsCalifornia environmental regulators said they plan to begin development of tougher nitrogen oxide standards for heavy trucks, possibly as early as 2017.
October 12, 2015