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This action will amend the Integrated Iron and Steel Manufacturing Facilities National Emission Standards for Hazardous Air Pollutants (NESHAP), 40 CFR part 63, subpart FFFFF, as required by the Clean Air Act (CAA). This action will address Louisiana Environmental Action Network v. EPA, 955 F.3d 1088 (D.C. Cir. 2020) (“LEAN”), in which the court held that EPA must set limits on uncontrolled hazardous air pollutant (HAP) emissions when the Agency conducts technology reviews under CAA section 112(d)(6), 42 U.S.C. section 7412(d)(6). The Iron and Steel Manufacturing Facilities NESHAP was promulgated pursuant to section 112(d) of the Clean Air Act on May 20, 2003, and subsequently amended on July 13, 2006. The residual risk and technology review (RTR) was promulgated pursuant to CAA sections 112(f) and 112(d)(6) on July 13, 2020. The NESHAP establishes emission limitations and/or work practice requirements based on maximum achievable control technology (MACT) for controlling emissions of HAP from iron-making blast furnaces; steel-making oxygen furnaces; ancillary operations, such as ladling, hot metal transfer, skimming and desulfurization; and sinter plants.