This joint resolution revokes the waiver granted to the California Air Resources Board regarding its Advanced Clean Cars II (ACC II) regulations, which include new requirements for low-emission vehicles and zero-emission vehicles. (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; Advanced Clean Cars II; Waiver of Preemption; Notice of Decision .
CRS summary — Public Law (2025-06-12)
| Date | Chamber | Question | Yea–Nay | Result | |
|---|---|---|---|---|---|
| 2025-05-01 | House | On Passage | 246–164 | Passed | ⭐ Became law |
| 2025-05-21 | Senate | On the Motion to Proceed | 51–46 | Motion to Proceed Agreed to | |
| 2025-05-22 | Senate | On the Joint Resolution | 51–44 | Joint Resolution Passed | ⭐ Became law |
Senate counts are senators only; a Vice President tie-breaking vote is not included (e.g. 50–50, passed).
