This joint resolution revokes waivers granted to the California Air Resources Board regarding several of its regulations, including the Heavy-Duty Vehicle and Engine Emission Warranty Regulations and Maintenance Provisions. (Under the Clean Air Act, California may seek waivers of the preemption prohibiting states from enacting certain emission standards.) Specifically, the joint resolution nullifies the Environmental Protection Agency notice titled California State Motor Vehicle and Engine Pollution Control Standards; Heavy-Duty Vehicle and Engine Emission Warranty and Maintenance Provisions; Advanced Clean Trucks; Zero Emission Airport Shuttle; Zero-Emission Power Train Certification; Waiver of Preemption; Notice of Decision .
CRS summary — Public Law (2025-06-12)
| Date | Chamber | Question | Yea–Nay | Result | |
|---|---|---|---|---|---|
| 2025-04-30 | House | On Passage | 231–191 | Passed | ⭐ Became law |
| 2025-05-22 | Senate | On the Motion to Proceed | 51–46 | Motion to Proceed Agreed to | |
| 2025-05-22 | Senate | On the Joint Resolution | 51–45 | Joint Resolution Passed | ⭐ Became law |
Senate counts are senators only; a Vice President tie-breaking vote is not included (e.g. 50–50, passed).
