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The Clean Air Act (CAA) requires EPA to regulate compounds that are listed as air toxics, also known as hazardous air pollutants (HAP). Air toxics are those pollutants known, or suspected, to cause cancer and other serious human health problems. The CAA requires the EPA to consider petitions to modify the list, by adding or removing substances. Individuals seeking to add a substance must demonstrate the substance is an air pollutant and that emissions, ambient concentrations, bioaccumulation or deposition of the substance are known to cause or may reasonably be anticipated to cause adverse effects to human health or to the environment. The Agency received two petitions to add n-propyl bromide (nPB) to the HAP list; one from the Halogenated Solvents Industry Alliance in October 2010 and one from the State of New York in November 2011. The EPA conducts two reviews when it receives a petition: (1) a completeness review to determine whether there is sufficient information on which to base a decision; and (2) a technical review to evaluate the merits of the petition. The petitions were determined to be complete and a notice of receipt of a complete petition was published in the Federal Register on February 6, 2015. A draft action seeking comments on the technical review of the petitions and on the EPA's initial determination of granting the petitions was published January 9, 2017 (82 FR 2354). This action will issue a final notice granting the petitions to add nPB to the list of HAP. A following action will add n-PB, as 1-bromopropane (CAS 106-94-5), to the CAA section 112(b)(1) list of HAP by modifying 40 CFR part 63, subpart C. This action is required since granting the petitions by itself just indicates the Administrator has accepted the petitions under the requirements laid out in CAA section 112(b)(3). The listing action is needed to modify the CAA section 112(b)(1) HAP list itself and regulated sources of nPB emissions by CAA Section 112(d).