Optional Reduced NOx Standards for Heavy-duty Vehicles
Mobile Source Control Division
In 2013, CARB adopted optional low oxides of nitrogen (NOx) emission standards for on-road heavy-duty engines to encourage engine manufacturers to introduce new technologies to reduce NOx emissions below the current mandatory on-road heavy-duty diesel engine emission standards. Please see the link below for a table of engines currently certified to the optional low NOx emission standards.
More about this program
Keep up to date with the latest information regarding the optional reduced NOx emission standards for on-road heavy-duty engines.