EPA opens comment period on truck emission rule changes

The Environmental Protection Agency has opened public comment on proposed changes to a 2023 truck emission rule, and it is asking truck drivers and other stakeholders to weigh in.

According to the Land Line report, the 2023 rule set new truck emission standards starting with model year 2027 vehicles. It also required nitrogen oxide, or NOx, reduction standards that were 80% stricter than previous standards.

The proposed revisions would replace engine deratements with audible or visual warnings, return the compliance timeline to 435,000 miles, and restore emissions-related warranties to five years or 100,000 miles.

The public comment period is open through Aug. 29. Comments can be submitted at Regulations.gov using docket number EPA-HQ-OAR-2026-0728.

EPA will also hold two public hearings. The first is at 9 a.m. Eastern on July 29, followed by another at 10 a.m. on July 30. Registration is required to listen or testify, and EPA says registration forms must be submitted no later than July 22 for those who want to testify.