The Legal Intelligencer
(by Julie Domike and Gina Falaschi)
The transportation sector is the nation’s largest source of greenhouse gas emissions. To reduce these emissions, cleaner transportation initiatives are on the rise nationwide, with new state programs being announced almost daily. While California has always been in the forefront of these enterprises, other states, including Pennsylvania, are not far behind. This is especially true of the new clean transportation initiatives for the medium- and heavy-duty vehicle market, which produces 25% of the transportation sector emission but only represents 4% of the vehicles on the road.
At a public hearing on June 25, the California Air Resources Board adopted a long-awaited Advanced Clean Trucks Regulation. California Air Resources Board, Notice of Decision (June 25, 2020). This program builds on California’s 2012 Advanced Clean Cars Regulation to further reduce emissions from the transportation sector by requiring truck manufacturers to sell a certain percentage of zero-emission vehicles beginning in model year 2024. The percentage will increase annually, meeting the ultimate goal of phasing out new diesel trucks by 2045.
The federal Clean Air Act affords California the ability to pass historic initiatives and to be at the forefront of setting new, more stringent, environmental standards. While Section 209 of the federal Clean Air Act generally preempts state and local emission standards for new motor vehicles, there are a few exceptions. See 42 U.S.C. Section 7543(a). The EPA can waive preemption for any state that had adopted standards for control of emissions from new motor vehicles or new motor vehicle engines prior to March 30, 1966. The only state that qualifies to receive such waivers is California, the only state to have adopted motor vehicle emission standards prior to March 1966. …


