The U.S. Climate Alliance submitted a letter to the U.S. Environmental Protection Agency (EPA) to strongly support approval of California’s clean trucks rule and urge EPA to grant California's request for a waiver under the CAA.

Read the Letter

2022 EPA Letter Transportation

U.S. Climate Alliance Requests EPA Approval of California's Clean Trucks Waiver

August 1, 2022

The Alliance has long supported state flexibility in the Clean Air Act (CAA) that permits California to adopt, and allows other states to follow, regulations with more protective emissions standards than the federal standards. We strongly support approval of California’s clean trucks rule, which was promulgated consistent with CAA requirements, and we urge EPA to grant the waiver without delay.  


The Alliance is committed to doing its part to tackle greenhouse gas emissions in the transportation sector — the largest source of climate pollution in the United States. Our states are leading the nation in deployment of zero-emission vehicles and are working to put cleaner and more efficient medium- and heavy-duty vehicles (MHDVs) on the road. Already, five more Alliance members have adopted California’s clean trucks regulation, and 16 Alliance members are currently collaborating with each other to foster a self-sustaining market for zero-emission MHDVs.  


EPA’s approval of this waiver is essential not only for California, but for all states that choose to adopt the Advanced Clean Trucks rule to protect their communities, advance their emission reduction targets, and lead the market transition to zero-emission vehicles.   

About the Alliance

Launched on June 1, 2017 by the governors of Washington, New York, and California to help fill the void left by the previous administration’s decision to withdraw the U.S. from the Paris Agreement, the Alliance has grown to include governors from across the U.S. Governors in the Alliance have pledged to collectively reduce greenhouse gas emissions by at least 26-28% below 2005 levels by 2025, at least 50-52% below 2005 levels by 2030, and collectively achieve overall net-zero greenhouse gas emissions as soon as practicable, and no later than 2050.


Alliance states and territories are achieving lower levels of air pollution, delivering more energy savings to homes and businesses, preparing more effectively for climate impacts, generating more electricity from zero-carbon sources, and collectively employing over 40% more workers in the clean energy sector than the rest of the country. For more information on Alliance members’ bipartisan, cross-sector climate action, see our Fact Sheet.