Regulatory Tracker

The Clean Air Act’s Good Neighbor provision requires upwind states to ensure that their instate sources do not contribute to downwind states’ attainment of the NAAQS. On Mar. 12, 2025, EPA announced its plan to roll back the Biden Administration’s Good Neighbor Plan, which the Supreme Court stayed in June 2024.

The Biden EPA strengthened mercury standards for coal-fired power plants, which industry challenged in the D.C. Circuit. The Trump EPA provided exemptions to 68 power plants and EPA has slated the rule for rollback.

EPA is reviewing Regional Haze state implementation plans. The Trump administration announced that it plans to restructure the Regional Haze Program.

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.

EPA sets NAAQS for six common and harmful pollutants: carbon monoxide, lead, PM, ozone, nitrogen dioxide, and sulfur dioxide.

EPA establishes the baseline requirements for new source review permits, which are then issued by state and local air pollution agencies. The Trump EPA has announced it plans to change the NSR program.

The Biden EPA finalized standards for GHG emissions from existing coal-fired power plants and new gas-fired power plants. The Trump EPA slated these rules for rollback.

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.