President Trump Signs Resolution Blocking California's Strict Zero-Emission Truck Mandates

11 states had adopted California's Advanced Clean Trucks rule before Congress blocked it

By 2035, California's ACT rule would have required 40% of Class 7–8 tractor sales and 75% of Class 4–8 straight truck sales to be zero-emission

Heavy-duty trucks make up about 6% of on-road vehicles but generate roughly 45% of smog-forming NOx pollution from all U.S. transportation

California reported 18,473 medium- and heavy-duty ZEV sales in 2023 — five times its ACT compliance requirement for that year

California holds a Clean Air Act waiver — in place since 1968 — that has historically allowed it to set stricter vehicle emission rules than federal standards