Public Hearing and Public Comments: Revision of Tier 4 Criteria Pollutant Standards – Ends July 6

https://www.epa.gov/regulations-emissions-vehicles-and-engines/public-hearing-and-public-comments-revision-tier-4

EPA invites public comment on the proposed rule, Revision of Tier 4 Criteria Pollutant Standards, Part 1: Amendments to Phase-In Schedule for Light-Duty and Medium-Duty Vehicles which was published in the Federal Register on May 18, 2026 under docket ID number [EPA–HQ–OAR–2025–3297; FRL–13030–02–OAR].