Clean Air

In September 2026, EPA rescinded most GHG emissions standards from fossil fuel-fired power plants. EPA also proposed a rule that would prevent it from issuing such standards.

Through two state plan approvals, EPA finalized a new policy that eases all states’ Regional Haze planning obligations. Environmental groups are challenging the approvals.

In June 2026, EPA partially withdrew SSM SIP Call findings of failure to submit, leaving four state agencies with outstanding SSM revision obligations.

EPA rescinded the 2024 mercury and air toxics standards (MATS) for power plants and reinstated the 2012 MATS.

EPA establishes the baseline requirements for new source review (NSR) permits, which are then issued by state and local air pollution agencies. In 2025 and 2026, EPA made changes to the NSR program easing permitting requirements.