EPA proposes reversal of North Dakota regional haze SIP disapproval

The EPA proposed on September 9, 2026 to repeal its December 2024 partial disapproval of North Dakota's regional haze State Implementation Plan for the second implementation period, and to approve the previously disapproved portions. This reverses the agency's prior stance, likely reflecting a policy shift under the current administration. The change affects regulatory oversight of air quality and visibility in North Dakota, with implications for state-federal environmental relations.