California Air Resources Board

The ACF Regulation (California Code of Regulations, Title 13, Sections 2013, 2013.1, 2013.2, 2013.3, 2013.4, 2014,2014.1, 2014.2, 2014.3, 2015, 2015.1, 2015.2, 2015.3, 2015.4, 2015.5, 2015.6, and 2016) is the latest development in CARB’s decades‑long history of setting increasingly stringent emission standards for mobile sources that are needed to protect the public health and welfare of Californians by improving air quality and by mitigating the harms posed by greenhouse gases. The ACF regulation complements CARB’s recently adopted Advanced Clean Trucks regulation, and will help advance the introduction of zero-emission technologies into California’s truck and bus fleets requiring fleets that are well suited for electrification to reduce emissions through requirements to both phase-in the use of Zero-Emission Vehicles (ZEVs) for targeted fleets and requirements that manufacturers only manufacture ZEV trucks starting in the 2036 model year. Achieving these and other milestones will contribute to meeting the goals in the Governor’s Executive Order N-79-20 and result in cleaner, more healthful air for all Californians, especially those communities most heavily impacted by air pollution. The ACF regulation is expected to introduce 1,690,000 ZEVs into the California fleet by 2050. Additionally, the ACF regulation is expected to result in $26.5 billion in statewide health benefits from improved air quality and save fleet owners an estimated $48.0 billion through 2050.

Achieving California’s long-term air quality, climate, and public health goals will require medium- and heavy-duty vehicles to significantly reduce their emissions, such as by embracing commercially available zero-emission technologies where feasible, and by using near-zero-emission technologies powered by clean, low‑carbon renewable fuels everywhere else. Promoting the development and use of zero-emission trucks will contribute to the goals set by the Governor’s Executive Order N-79-20 and the Sustainable Freight Action Plan, and will help achieve emission reductions as outlined in the State Implementation Plan, Senate Bill (SB) 350 (de León, Chapter 547, Statutes of 2015), Assembly Bill 32 (Nuñez, Chapter 488, Statutes of 2006), and SB 32 (Pavley, Chapter 249, Statutes of 2016), and Assembly Bill 1279. The ACF regulation is an important part of California’s broader strategy to increase clean, affordable transportation options such as zero-emission technologies, innovative methods to improve freight activity, and transportation system efficiency in California.