# 2024-31128: EPA Lets California Be Even More Annoying About Car Emissions

2024-31128, California State Motor Vehicle and Engine Pollution Control Standards; Advanced Clean Cars II; 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/2024-31128
- As of: 2026-06-08
- Plain-text twin of the page above; the HTML and this file carry the same facts.

## Facts
- Document number: 2024-31128
- Title: California State Motor Vehicle and Engine Pollution Control Standards; Advanced Clean Cars II; 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

EPA Lets California Be Even More Annoying About Car Emissions

## Summary

The EPA just gave California the green light to enforce its Advanced Clean Cars II rules, which means car makers selling in California will need to meet tougher pollution and clean car standards. This decision helps push cleaner, greener vehicles on the road, starting soon, and could save money on health and environmental costs down the line. If anyone wants to challenge this, they have until March 7, 2025, to speak up.

## Abstract

The Environmental Protection Agency ("EPA") is providing notice of its decision granting the California Air Resources Board's ("CARB's") request for a waiver of Clean Air Act preemption for its Advanced Clean Cars II ("ACC II") regulations. EPA's decision was issued under the authority of the Clean Air Act ("CAA" or "Act") section 209.

## Effects PRIA read

- EPA Approves California ACC II Waiver: benefit, medium. On December 17, 2024, the EPA granted California a Clean Air Act section 209 waiver allowing California to enforce its Advanced Clean Cars II (ACC II) regulations for new 2026 and subsequent model year light- and medium-duty on-road vehicles in California.
- Manufacturers Must Sell More ZEVs Starting 2026: cost, medium. The ACC II ZEV program requires vehicle manufacturers to sell increasing percentages of zero-emission vehicles beginning with the 2026 model year; manufacturers may meet up to 20 percent of their sales requirement using plug-in hybrid vehicles (PHEVs) that meet specified requirements.
- Stricter LEV IV Emissions Standards Applied: benefit, medium. ACC II’s LEV IV requirements apply fleet-average exhaust and evaporative emission standards solely to internal combustion engine vehicles (excluding ZEVs from the fleet calculation), reduce the maximum allowed exhaust and evaporative emission rates, and apply emissions standards to a broader range…

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## Sources
- [2024-31128 on federalregister.gov](https://www.federalregister.gov/documents/2025/01/06/2024-31128/california-state-motor-vehicle-and-engine-pollution-control-standards-advanced-clean-cars-ii-waiver)
- [2024-31128 as published (PDF)](https://www.govinfo.gov/content/pkg/FR-2025-01-06/pdf/2024-31128.pdf)

## Related
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- [All Federal Register documents](https://policyrisk.com/federal-register)

Source: PRIA, https://policyrisk.com/federal-register/2024-31128 (as of 2026-06-08).