WTO notification · TBT
United StatesProposed measure, not in force yet
Official title
Revision of Tier 4 Criteria Pollutant Standards, Part 1: Amendments to Phase-In Schedule for Light-Duty and Medium-Duty Vehicles
The United States notified this proposed TBT measure to the WTO on 19 May 2026. The comment period closed on 6 July 2026.
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Source: WTO ePing (opens in a new tab). Summaries by Expodite, which is independent of the WTO.
Published here:
Pollutant emission standards for light-duty and medium-duty vehicles; Product and company certification. Conformity assessment; Environmental protection; Air quality; Road vehicle systems
The comment period closed on 6 July 2026. You can still raise concerns about the measure with your country's WTO TBT enquiry point, quoting the document symbol G/TBT/N/USA/2281; it can take them up with the United States.
Find your country's enquiry point on WTO ePing (opens in a new tab)Proposed rule - 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' (notified as G/TBT/N/USA/1991/Add.1). 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. The EPA plans to hold a public hearing for this proposal on 3 June and 4 June 2026. If there is sufficient interest, an additional day of hearings will be held on the subsequent day. Information on the public hearing is available at Please also refer to this website for any updates regarding the hearings. The EPA does not intend to publish additional documents in the Federal Register…
Expodite writes its summary from the official record. The notification and the documents it notifies are on the WTO's own websites.
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