Cleaner Trucks Initiative starts NOx-reduction journey

The U.S. Environmental Protection Agency (EPA) is in the beginning stages of establishing new NOx regulations for heavy-duty on-highway trucks. The agency is spurred by advances in technology and a desire to streamline the certification process.

The EPA last revised NOx standards for on-road heavy-duty trucks and buses in January 2001. The process that culminated in those standards actually started in the late 1990s. Rulemaking takes time, both to understand technology trends and incorporate a wide group of stakeholders. It will take no less time to update those NOx standards under the program called the Cleaner Trucks Initiative (CTI), announced by the EPA in November 2018.