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The EPA promulgated a rulemaking for the halogenated solvent cleaners source category in 2007 (72 FR 25138; May 3, 2007). That rule, applicable to existing and new sources of hazardous air pollutants, included National Emission Standards for Hazardous Air Pollutants (NESHAP) at 40 CFR Part 63, Subpart T, to limit emissions of three pollutants: methylene chloride; trichloroethylene; and perchloroethylene. Following promulgation, the EPA received several petitions for reconsideration. The planned-for action would address petitioners’ issues by providing a required periodic technology review to satisfy Clean Air Act (CAA) section 112(d)(6). In addition, while we do not plan to redo the current risk analysis, we do plan to address the comments raised on the risk analysis as part of the petitions for reconsideration. Further, pursuant to subsections (d)(2) and (d)(3) of CAA section 112, the amendments would newly include technology-based emission standards (maximum achievable control technology, or MACT) for 1-bromopropane (1-BP; also known as n-propyl bromide, nPB). The chemical compound 1-BP was listed as a HAP under CAA section 112(c) effective February 4, 2022 (87 FR 393; January 5, 2022).