EPA and the National Highway Traffic Safety Administration (NHTSA) amended carbon dioxide standards for passenger cars and light trucks with model years 2021 and later, and NHTSA amended fuel economy standards for model year 2021 and set new fuel economy standards for model years 2022-2026; the rules represent the second part of the Administration's action related to the proposed 2018 Safer Affordable Fuel-Efficient Vehicles Rule and follow the agencies' action in September 2019 to ensure one national program for automobile fuel economy and carbon dioxide emission standards by finalizing regulatory text related to preemption under the Energy Policy and Conservation Act and withdrawing a waiver previously provided to California under the CAA.

The National Highway Traffic Safety Administration and EPA finalized the Safer Affordable Fuel-Efficient (SAFE) Vehicles Rule for Model Years 2021-2026 Passenger Cars and Light Trucks; the rule amends existing greenhouse gas (GHG) and corporate average fuel economy standards for light-duty vehicles and withdraws the waiver previously provided to California for its GHG and zero emission vehicle programs.