Under the federal Clean Air Act, once California obtained a waiver from the U.S. EPA to adopt its Advanced Clean Trucks rule, other states could choose to adopt the CARB rule or the federal EPA rule on truck and engine manufacturers emissions requirements. Now some states that had previously adopted the ACT rule are backing off of that decision.

As reported in Overdrive, New York is the latest state to consider dropping or delaying its adoption of the ACT, which was set to go into effect on January 1, 2025. The Advanced Clean Trucks rule requires manufacturers of vehicles greater than 8,500 pounds to sell an increasing number of zero-emission vehicles in New York, starting with a 7% ZEV sales percentage in 2025 and ramping up, eventually, to 100% ZEV by 2045.

As of last week, the New York State Thruway Authority, which covers all of I-90, much of I-87 and other vital trucking corridors in the state, said there were "no Medium or Heavy-duty [electric vehicle] chargers on its system."

In addition, the Oregon House Committee on Climate, Energy and Environment last week held a public hearing on House Bill 3119 -- a bipartisan effort to delay Oregon's ACT rule, which went into effect January 1, 2025.  It would also declare an emergency and demand the state's Department of Environmental Quality to delay adoption of the regulations until January 1, 2027.