This week, leaders of the U.S. House Energy and Commerce Committee sent a letter to California Air Resources Board (CARB) Executive Officer Steven Cliff, demanding answers on California’s refusal to implement the Clean Air Act as written by Congress and its attempted enforcement of state vehicle emission standards that, according to the Committee, “… disregard recent Congressional actions to disapprove waivers of federal preemption under the Clean Air Act (CAA).”
The Committee cites CARB’s failure to provide documents requested in its August 11, 2025 letter, including internal guidance, communications with other states, and correspondence with the Governor’s Office and Attorney General.
If CARB does not comply by December 5, 2025, the Committee will seek transcribed interviews with six senior CARB officials, including former Chair Liane Randolph and current Chair Lauren Sanchez, by December 12, 2025. The information gathered will help the Committee determine whether California’s waiver authority under Section 209(b) of the CAA should be modified or eliminated. Litigation over these waivers is ongoing in federal court.
This dispute could reshape the regulatory landscape for vehicle emissions nationwide. If waiver authority is curtailed, California—and other states following its lead—may lose the ability to set stricter standards, impacting manufacturers, fleets, and clean transportation initiatives. Industry stakeholders should monitor this closely, as future compliance obligations and investment strategies could change significantly.
Read more here.