Clean Air – Page 2 – Environmental and Energy Law Program

Regulatory Tracker

Implementation of 2015 Ozone National Ambient Air Quality Standards (NAAQS)

Under the Trump executive order Regulatory Freeze Pending Review, the Biden administration’s final rule setting deadlines for states to submit SIPs for nonattainment areas did not go into effect. On June 3, 2025, EPA announced its plans to reconsider the rule.

September 15, 2025

Regulatory Tracker

National Ambient Air Quality Standards (NAAQS) for Particulate Matter (PM)

The CAA requires EPA to review and set primary and secondary standards for PM NAAQS every 5 years. The Biden EPA strengthened the standard in March 2024. On Aug 13, 2025, EPA announced it plans to reconsider the rule.

September 5, 2025

Regulatory Tracker

Power Plant Startup, Shutdown, and Malfunction Rule

In early January 2025, the Biden EPA withdrew its direct final rule and indicated it would release a subsequent rule addressing the 13 states that failed to submit state implementation plan revisions.

September 5, 2025

Regulatory Tracker

Once In Always In Guidance for Major Sources under the Clean Air Act

Congress used the Congressional Review Act to repeal the 2024 rule which required facilities that reclassified from major sources of hazardous air pollutants to area sources to remain subject to the major source standards for 7 pollutants.

August 19, 2025

CleanLaw Podcast

CleanLaw — What Science and the Law Say About EPA’s Authority to Regulate GHGs

Jody Freeman, Richard Lazarus, and Stanford’s Solomon Hsiang discuss EPA’s proposal to eliminate greenhouse gas regulations and the flawed science the proposal relies on.

August 18, 2025

Legal Analysis

EPA’s Proposal to Eliminate the Endangerment Finding and Motor Vehicle Greenhouse Gas Regulations

An analysis of EPA’s proposal and assessment of its legal risks and gaps.

August 12, 2025

CleanLaw Podcast

CleanLaw — Trump’s Move to Kill the Clean Air Act’s Climate Authority, Forever

In this joint Shift Key/CleanLaw episode, Jody, Rob, and Jesse discuss EPA’s proposed roll back of the endangerment finding.

August 6, 2025

EELP News

‘This Isn’t Just Another Regulatory Rollback. It’s an Assault on the Foundation of all Federal Climate Policy.’

In the LA Times, Jody Freeman details the administration’s attack on the legal and scientific basis of the endangerment finding.

August 5, 2025

Regulatory Tracker

Regulating Greenhouse Gases for New and Existing Fossil Fuel-Fired Power Plants

In June 2025 EPA proposed a rule rolling back the 2024 EPA standards for GHG emissions from existing coal-fired power plants and new gas-fired power plants.

August 1, 2025