# 2024-31125: California Gets Green Light for Super-Strict Truck Pollution Rules

2024-31125, California State Motor Vehicle and Engine and Nonroad Engine Pollution Control Standards; The “Omnibus” Low NOX Regulation; Waiver of Preemption; Notice of Decision, is a Federal Register notice from an unnamed agency published 2025-01-06, effective 2024-12-17; PRIA reads it as touching household money (as of 2026-06-08).

- Canonical: https://policyrisk.com/federal-register/2024-31125
- As of: 2026-06-08
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2024-31125
- Title: California State Motor Vehicle and Engine and Nonroad Engine Pollution Control Standards; The “Omnibus” Low NOX Regulation; Waiver of Preemption; Notice of Decision
- Type: Notice
- Agencies: unknown
- Citation: unknown
- Published: 2025-01-06
- Effective: 2024-12-17
- Comments close: not stated
- Significant: no
- Touches household money: yes
- Regulation identifier numbers: none
- Last updated: 2026-06-08

## In one line

California Gets Green Light for Super-Strict Truck Pollution Rules

## Summary

The EPA just gave California the green light to enforce its new tough rules that cut pollution from big trucks, engines, and off-road diesel machines. This means cleaner air for everyone, but manufacturers will need to meet these stricter standards soon. If anyone wants to challenge this decision, they have until March 7, 2025, to speak up.

## Abstract

The Environmental Protection Agency ("EPA") is providing notice of its decision to grant the California Air Resources Board's ("CARB") request for a waiver of Clean Air Act (CAA) preemption for its Heavy-Duty Vehicle and Engine "Omnibus" Low NO<INF>X</INF> Regulations ("Omnibus Low NO<INF>X</INF> program"). EPA's decision also includes an authorization for portions of the Omnibus Low NO<INF>X</INF> program that pertain to off-road diesel engines. This decision was issued under the authority of the Clean Air Act ("CAA" or "Act") section 209.

## Effects PRIA read

- California may enforce 2024+ heavy-duty NOx rules: cost, medium. EPA granted California a waiver so California can enforce its Omnibus Low NOX regulations for new 2024 and subsequent model year on-road heavy‑duty vehicles and engines. The Omnibus program includes revised heavy‑duty emission standards, test procedures, regulatory useful life, and emissions warran…
- Off‑road diesel engine PM rules authorized: cost, medium. EPA authorized portions of California's Omnibus Low NOX program that apply to off‑road diesel engines, including new particulate matter (PM) emission standards for off‑road diesel‑fueled auxiliary power units. Makers and sellers of off‑road diesel engines and equipment used in California will be su…
- EPA found California standards protective and feasible: benefit, medium. EPA concluded that California's Omnibus Low NOX standards are, in the aggregate, at least as protective of public health and welfare as applicable Federal standards and found those standards technologically feasible within the available lead time. EPA therefore granted the requested waiver and auth…

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## Sources
- [2024-31125 on federalregister.gov](https://www.federalregister.gov/documents/2025/01/06/2024-31125/california-state-motor-vehicle-and-engine-and-nonroad-engine-pollution-control-standards-the-omnibus)
- [2024-31125 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-01-06/pdf/2024-31125.pdf)

## Related
- [Previous: 2024-31123, California State Nonroad Engine Pollution Control Standards; Small Off-Road Eng…](https://policyrisk.com/federal-register/2024-31123)
- [Next: 2024-31128, California State Motor Vehicle and Engine Pollution Control Standards; Advanced…](https://policyrisk.com/federal-register/2024-31128)
- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2024-31125 (as of 2026-06-08).