Revision of Tier 4 Criteria Pollutant Standards, Part 1: Amendments to Phase-In Schedule for Light-Duty and Medium-Duty Vehicles
Key claim: The EPA is proposing to delay the Tier 4 criteria pollutant emissions standards phase-in for certain light-duty and medium-duty vehicles, extending Tier 3 standards through model years 2027–2028 and pushing Tier 4 compliance to MY 2029, citing changing circumstances and feasibility concerns.
Abstract
(Proposed Rule · Environmental Protection Agency) 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 pollutant standards for certain vehicles to address changing circumstances and feasibility concerns. These amendments, if finalized, would extend the Tier 3 standards for certain vehicles to model years (MYs) 2027 and 2028 such that the Tier 4 standards for these vehicles would phase in starting with MY 2029. The EPA is also proposing other changes to the test protocols used to evaluate emissions performance for certification and related regulatory issues. Potential amendments to the Tier 4 standards and other program elements will be proposed separately in a future Part 2 rulemaking.
Why this matters
Tier 4 sets the next generation of criteria pollutant limits (NOx, PM, VOCs) for new light- and medium-duty vehicles, and its timing directly shapes fleet emissions, compliance costs, and public health outcomes for the late 2020s. Delaying the phase-in preserves existing Tier 3 requirements for two additional model years, giving manufacturers more lead time but deferring anticipated air-quality gains. The proposal signals a broader recalibration of vehicle emissions policy that will interact with fuel economy, EV, and state-level (e.g., California waiver) programs.