Clean Cars – Environmental and Energy Law Program

Regulatory Tracker

Clean Car Rules — Corporate Average Fuel Economy Standards/Greenhouse Gas Standards

The Trump EPA issued a proposal to rescind the Endangerment Finding and the GHG standards for light, medium, and heavy-duty vehicles.

October 27, 2025

Regulatory Tracker

Corporate Average Fuel Economy Penalties

In July 2025, Congress eliminated the Corporate Average Fuel Economy civil penalties, resetting penalties to $0.00.

July 4, 2025

Legal Analysis
Quick Takes

Quick Take: Diamond Alternative Energy v. EPA

A look at the decision, how this case ended up in the Supreme Court, and how California’s vehicle standards work.

June 27, 2025

Legal Analysis

Clean Fuel Standard Directed Benefit Mechanisms to Promote Equity

New paper co-authored by Abby Husselbee looks at how CFS programs could be designed to direct public health, mobility, and economic benefits.

April 3, 2025

CleanLaw Podcast

CleanLaw — The Road to Clean Cars and Clean Air: California’s Pivotal Role

California’s role in driving car and air emissions regulation and what may happen in the coming years under either election outcome.

June 13, 2024

Legal Analysis

EPA Finalizes Multipollutant Vehicle Emissions Standards for Model Years 2027 through 2032

A review of the light-duty vehicle tailpipe standards that EPA adopts in the final rule and explanation of EPA’s legal authority to promulgate those standards.

April 4, 2024

CleanLaw Podcast

CleanLaw–3 lawsuits on auto emissions, 1 United Auto Workers strike, and the impact on the EV transition with Jody Freeman, Kevin Poloncarz, and Jack Ewing

Jody, Kevin, and Jack discuss three cases before the D.C. Circuit about how agencies set vehicle standards to reduce greenhouse gas emissions and improve fuel efficiency.

October 17, 2023

Quick Takes

Texas v. EPA Quick Take

These new standards are more stringent than those promulgated by the Trump administration in 2020 and reflect EPA’s consideration of improved vehicle technology, reduced electric vehicle battery costs, and the shift toward electrification by the auto industry.

August 15, 2023

Legal Analysis

Ambitious and Achievable: EPA’s Proposed Multi-Pollutant Emissions Standards for Model Years 2027 and Later Light- and Medium-Duty Vehicles

Overview of the proposed requirements and review the statutory authority, regulatory history, and evolving legislative and economic context in which EPA developed this proposal.

April 25, 2023