CARB permanently adopts Emergency Vehicle Emissions Regulations

The California Air Resources Board permanently adopted the Emergency Vehicle Emissions Regulations that were initially adopted in 2025 as a temporary measure after the federal government purportedly disapproved California's waivers for newer vehicle emissions regulations, including Advanced Clean Cars II (ACC II) and Heavy-Duty Engine and Vehicle Omnibus (Omnibus). The amendments clarify that California's earlier vehicle emission standards remain in effect. Manufacturers may continue to seek CARB certification to pre-ACC II/Omnibus standards, may voluntarily comply with ACC II/Omnibus requirements, and voluntary compliance provides regulatory certainty and may benefit state procurement preferences. California is challenging federal actions in court.