Air Plan Approval; Arizona; Interstate Transport Requirements for the 2012 Fine Particulate Matter National Ambient Air Quality Standards

Document 2026-07400 is a Final Rule published by the Environmental Protection Agency in the Federal Register on April 16, 2026, with an effective date of May 18, 2026. The Clean Air Act (CAA) requires each state implementation plan (SIP) to contain adequate provisions prohibiting emissions that will significantly contribute to nonattainment or interfere with maintenance of air quality in other states. The State of Arizona submitted SIP revisions to the Environmental Protection Agency (EPA) to address these requirements for the 2012 fine particulate matter (PM<INF>2.5</INF>) national ambient air quality standards (NAAQS). The EPA is finalizing approval of Arizona's SIP submission as meeting the requirement that the Arizona SIP contains adequate provisions to prohibit emissions activity, within the State, from emitting air pollutants in amounts that will significantly contribute to nonattainment or interfere with maintenance of the 2012 PM<INF>2.5</INF> NAAQS in any other state. View the original at https://www.federalregister.gov/documents/2026/04/16/2026-07400/air-plan-approval-arizona-interstate-transport-requirements-for-the-2012-fine-particulate-matter.

No. Document 2026-07400 is not classified as economically significant under Executive Order 12866. Economically significant rules require OIRA review and are estimated to have impacts of $100 million or more per year.