Effective May 22, 2025, the U.S. Senate has revoked the Advanced Clean Trucks (ACT) rule. Additionally, they reversed California’s EPA waivers for Advanced Clean Cars II and the Omnibus Low NOX regulation.
ACT Rule Revoked
According to TPS, “The U.S. Senate passed H.J. Res. 87 and 89 Thursday (May 22), which would revoke EPA waivers granted to California’s Air Resources Board (CARB) in 2024 for its low-NOx Omnibus and Advanced Clean Trucks rules.” (Source) With the Senate approving these two House resolutions, they have effectively halted the state’s push to ban diesel trucks and mandate the adoption of zero-emission vehicles (ZEVs). Earlier the same day, the Senate also voted to overturn California’s ZEV mandate for the automotive industry.
Both regulations, which went into effect last year, aimed to tighten emissions standards in the trucking industry. The ACT rule required truck manufacturers to ensure a certain percentage of their sales were zero-emission vehicles (ZEVs), while the Omnibus rule required new diesel engines meet stricter greenhouse gas emission limits, exceeding current federal EPA standards.
While the Senate’s revocation of California’s ACT rule directly targets that state, the impact affects the other states that have adopted the same regulations. Among the states affected are Colorado, Maryland, Massachusetts, New Jersey, New Mexico, New York, Oregon, Rhode Island, Vermont, and Washington. (Source)