EPA Issues Proposed Rule on Tier 4 Phase-In for Light- and Medium-Duty Vehicles
May 21, 2026
May 21, 2026
WASHINGTON, May 21 (TNSFR) -- The U.S. Environmental Protection Agency (EPA) is reconsidering the Tier 4 criteria pollutant standards for new motor vehicles promulgated within the final rule entitled "Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light-Duty and Medium-Duty Vehicles." This reconsideration will occur in two separate, but coordinated, rulemakings. In this Part 1 rulemaking, the EPA is proposing to amend the phase-in schedule for the Tier 4 criteria po . . .