SACRAMENTO – The California Air Resources Board (CARB) today approved amendments to the state’s Advanced Clean Truck (ACT) and Zero-Emission Powertrain (ZEP) Certification standards to maintain the emissions benefits while providing manufacturers additional flexibility. Through the partnership, truck manufacturers committed to meeting CARB’s regulations in the state regardless of CARB’s overall authority to implement those regulations. Over the last 50 years, the state’s clean air efforts have saved $250 billion in health costs through reduced illness including reducing diesel-related cancer risk nearly 80%. Although California standards have dramatically improved air quality, the state’s unique geography means continued progress on vehicle emissions is required to achieve state and federal standards. What’s nextIn response to illegal federal efforts to revoke California’s clean air waivers, Governor Gavin Newsom signed an executive order on June 12, 2025.