Rulemaking

Revision of Tier 4 Phase-in Schedule for Light-Duty and Medium-Duty Vehicles

🏛 Environmental Protection Agency (EPA)EPA-HQ-OAR-2025-3297

Climate & Emissions Vehicles & Auto Safety

Documents

57

Total comments

353

1 awaiting analysis

Comment status

Closed

Last activity

Jul 14, 2026

In this docket

Documents

Rules, notices, and supporting material — the primary rule pinned first.

All 57 Supporting & Related Material 56 Proposed Rule 1

Proposed Rule· May 18, 2026
Tier 4 Criteria Pollutant Standards, Part 1: Phase-In Schedule for Light-Duty and Medium-Duty Vehicles→
Closed on Jul 7, 2026💬 353