# 2026-02350: Air Plan Revisions; California; Heavy-Duty Vehicle Inspection and Maintenance Program

2026-02350, Air Plan Revisions; California; Heavy-Duty Vehicle Inspection and Maintenance Program, is a Federal Register rule from Environmental Protection Agency published 2026-02-06, effective 2026-03-09 (as of 2026-06-11).

- Canonical: https://policyrisk.com/federal-register/2026-02350
- As of: 2026-06-11
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2026-02350
- Title: Air Plan Revisions; California; Heavy-Duty Vehicle Inspection and Maintenance Program
- Type: Rule
- Agencies: Environmental Protection Agency
- Citation: 91 FR 5325
- Published: 2026-02-06
- Effective: 2026-03-09
- Comments close: not stated
- Significant: no
- Touches household money: no
- Regulation identifier numbers: none
- Last updated: 2026-06-11

## Summary

The EPA is giving a thumbs-up to California’s new rules for checking and fixing big trucks over 14,000 pounds to cut pollution, but it’s saying no to applying these rules to trucks from other states. This means California’s program will be official and enforceable starting March 9, 2026, helping keep the air cleaner without extra penalties or costs for out-of-state vehicles. Truck owners in California should get ready for these updated inspections soon!

## Abstract

The U.S. Environmental Protection Agency (EPA) is taking final action to partially approve and partially disapprove a submission by the State of California to revise its State Implementation Plan (SIP) relating to the control of emissions from non-gasoline combustion vehicles over 14,000 pounds. The EPA's partial approval will allow the submitted Heavy-Duty Inspection and Maintenance Regulation ("HD I/M Regulation") to become federally enforceable as part of the California SIP with respect to vehicles registered within the State. The EPA is partially disapproving the submission to the extent that the HD I/M Regulation purports to apply to out-of-state vehicles as inconsistent with the Clean Air Act (CAA), because the State has not provided adequate assurances under CAA section 110(a)(2)(E)(i) that implementation of the SIP is not prohibited by Federal law. The partial disapproval will not trigger CAA section 179 sanctions because the submittal is not a required submission under CAA section 110(a)(2).

## Effects PRIA read

- California truck owners must comply: cost, high. If you own or operate a heavy-duty vehicle registered in California (over 14,000 pounds GVWR), the EPA-approved parts of California’s Heavy-Duty Inspection and Maintenance (HD I/M) Regulation become federally enforceable as part of the SIP starting March 9, 2026. You must report owner and vehicle i…
- EPA blocks federal reach to out‑of‑state trucks: benefit, medium. The EPA disapproved the parts of California’s submission that would make the HD I/M Regulation apply to vehicles registered outside California (including out-of-country vehicles) that merely traverse the State, so those extraterritorial requirements will not become federally enforceable. California…

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## Sources
- [2026-02350 on federalregister.gov](https://www.federalregister.gov/documents/2026/02/06/2026-02350/air-plan-revisions-california-heavy-duty-vehicle-inspection-and-maintenance-program)
- [2026-02350 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2026-02-06/pdf/2026-02350.pdf)

## Related
- [Previous: 2026-02344, Approval and Promulgation of Air Quality Implementation Plans; Nevada; Regional…](https://policyrisk.com/federal-register/2026-02344)
- [Next: 2026-02354, Safety Zone; Annual Fireworks Displays and Other Events in the USCG Heartland D…](https://policyrisk.com/federal-register/2026-02354)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2026-02350 (as of 2026-06-11).