The U.S. Climate Alliance submitted a letter to the U.S. Environmental Protection Agency (EPA) supporting timely approval of California’s request for a waiver under the Clean Air Act (CAA) for the Advanced Clean Cars II (ACC II) regulation.

Read the Letter

2024 EPA Letter Transportation

U.S. Climate Alliance Requests EPA Approval of California’s Clean Cars Waiver

February 23, 2024

The Alliance has long supported state flexibility under the Clean Air Act (CAA) that permits California to adopt, and allows other states and territories to follow, regulations that can have more protective emissions standards than the federal standards. In comments to EPA, the Alliance encouraged timely approval of California’s waiver request for the Advanced Clean Cars II (ACC II) regulation. ACC II accelerates the adoption of zero-emission light-duty vehicles and supports our shared goals to confront the climate crisis, reduce harmful air pollution, advance environmental justice, promote American manufacturing and good-paying jobs, save consumers money, and protect public health.  


The Alliance stands firmly with California and its authority under the CAA to set its own vehicle emission standards, as well as the other states and territories that choose to voluntarily adopt those standards. 


Read the Alliance’s full letter here.

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 24 governors from across the U.S. representing approximately 60% of the U.S. economy and 55% of the U.S. population. 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.


The Alliance’s states and territories continue to demonstrate that climate action goes hand-in-hand with economic growth, job creation, and better public health. While reducing emissions by 18% between 2005 and 2021, Alliance members grew their collective GDP by nearly 30%. The coalition’s states and territories are employing more workers in the clean energy sector, achieving lower levels of dangerous air pollutants, and preparing more effectively for climate impacts and executing more pre-disaster planning than the rest of the country.