Rollback of Mercury/Toxic Standards Rule (Illinois v. U.S. Environmental Protection Agency, D.C. Circuit)

Lawsuit challenging the Environmental Protection Agency’s rollback of the 2024 Mercury and Air Toxics Standards Rule, which would allow power plants to release more dangerous chemicals into the air—chemicals that can travel across state lines and settle into rivers and waterways.

Litigation Details

Case filed on: March 31, 2026

Docket Links:      Trial »

Updates

Date

Update

03/31/2026

On 3/31/26, the states filed their petition for review.

05/18/2026

On 5/18/26, the plaintiff states and plaintiffs in the consolidated cases filed a motion to hold the cases in abeyance.

08/13/2026

On 8/13/26, the District of Columbia Circuit Court of Appeals issued an order holding the cases in abeyance pending further order of the court.