Comment submitted by Hyundai Motor America
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Summary: Hyundai Motor America supports the proposed 2-year delay of Tier 4 standards and the extension of Tier 3 standards for model years 2027-2028. The company emphasizes the need for regulatory certainty and an expeditious release of Part 2 to facilitate product planning and maintain competitiveness.
Please see Hyundai's comments attached in response to EPA’s Proposed Rule: Revision of Tier 4 Criteria Pollutant Standards, Part 1: Amendments to Phase-In Schedule for Light-Duty and Medium-Duty Vehicles, EPA-HQ-OAR-2025-3297