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The Agency received two petitions to add 1- bromopropane (1-BP) to the list of Hazardous Air Pollutants (HAP) under section 112 of the Clean Air Act (CAA). After review and comment, the EPA found that the petitioners met the requirements contained in CAA section 112(b)(3) and granted the petition. The final action granting the petitions was published on June 18, 2020 (85 FR 36851). This subsequent action adds 1-BP (CAS 106-94-5) to the CAA section 112(b)(1) list of HAP by modifying 40 CFR part 63, subpart C, which will result in regulation of 1-BP under section 112 of the CAA. Before proposing regulatory changes, the agency wants to assess whether changes are warranted to the General Provisions of 40 CFR part 63, subpart A or other part 63 subparts to address impacts from this listing action. The agency will, thus, issue an Advanced Notice of Public Rule Making (ANPRM), seeking public comment and information, followed by a proposed and final action to add 1-BP to the CAA section 112(b)(1) list of HAP.