Clean Air – Page 3 – Environmental and Energy Law Program

Quick Takes

EPA Finalizes Weakened Standards for OOOO Rules

Rule loosens requirements for flares and vent gas. EPA states the revisions are intended to provide flexibility to oil and gas operators.

April 10, 2026

Legal Analysis

EPA’s Final Rule Rescinding 2024 MATS Rule and Reinstating 2012 Standards

The legal foundations, regulatory history, and contested cost-benefit rationale behind EPA’s repeal of the 2024 MATS rule.

March 18, 2026

Quick Takes

EPA Rejects Colorado’s Regional Haze Plan Over Disputed Coal Plant Closure

A quick take on the disapproval, including a look at some of the legal arguments raised by commenters.

March 18, 2026

Regulatory Tracker

Ethylene Oxide (EtO) Emissions Standards for Commercial Sterilizers

In March 2026, EPA proposed rolling back many of the 2024 rule’s more stringent emissions limits.

March 17, 2026

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‘The Clean Air Act is the bedrock of U.S. climate regulation, but it cannot do the job alone.’

Jody Freeman in Yale Environment 360: Now is the time to develop climate strategies that can be pursued when the political balance shifts.

March 3, 2026

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Podcast: Unpacking EPA’s Decision to Rescind the Endangerment Finding

Jody Freeman on the history of the Endangerment Finding, EPA’s rescission, and what could happen if it reaches the Supreme Court.

March 2, 2026

Legal Analysis

Eliminating the Foundation: Vulnerabilities in and Implications of EPA’s Endangerment Finding Rescission

Analysis breaking down EPA’s arguments in the final rule and what it could mean for regulating GHG emissions in the future.

March 2, 2026

Legal Analysis

Climate Brief: The Legal Reasoning Behind the Endangerment Rescission

How the Trump Administration justified eliminating the bedrock finding for federal greenhouse-gas regulation, and what comes next.

February 17, 2026

Legal Analysis

The Congressional Review Act in 2025: Expanding Use and Emerging Questions

After decades of limited use, Congress used the Congressional Review Act 22 times in 2025, testing the boundaries of congressional power, agency rulemaking, and the courts’ role in reviewing CRA actions.

February 5, 2026