Final rule · 2026-17494

Air Plan Approval; Arkansas; Regional Haze State Implementation Plan for the Second Implementation Period

Pursuant to the Clean Air Act (CAA or the Act), the U.S. Environmental Protection Agency (EPA) is finalizing approval of a State Implementation Plan (SIP) revision submitted by the State of Arkansas through the Division of Environmental Quality (DEQ) on August 8, 2022, clarified by DEQ on July 29, 2025, and further supplemented on May 4, 2026, to satisfy the requirements of the Act and the EPA's Regional Haze Rule (RHR) for visibility protection in mandatory Class I Federal areas (Class I areas) for the program's second implementation period. Arkansas' SIP submission addresses the requirement that States must revise their long-term strategies for making reasonable progress to prevent any future and remedy any existing man-made visibility impairment in the Class I areas. The EPA is taking this action pursuant to CAA sections 110 and 169A.