The EPA is finalizing requirements for sources that reclassify from major source status to area source status under the National Emission Standards for Hazardous Air Pollutants (NESHAP) program. The requirements of this final rule apply to all sources that choose to reclassify after September 10, 2024. The final amendments include a requirement that sources subject to certain major source NESHAP used to meet the Agency's obligations under the Clean Air Act (CAA) for seven specific persistent and bioaccumulative pollutants must remain subject to those NESHAP even if the sources reclassify to area source status. This requirement is based on the EPA's analysis of the statute and of comments received on the EPA's 2023 proposal to amend requirements for NESHAP-regulated sources that choose to reclassify from major to area source status. These final amendments will assure that sources accounting for not less than 90 per centum of the aggregate emissions of each persistent and bioaccumulative hazardous air pollutant (HAP) listed in CAA remain subject to standards promulgated under the CAA, as the Act requires, and will thereby ensure continued health protections from NESHAP that regulate those HAP. Additionally, we are finalizing clarifications to notification requirements and updating language regarding submittal of confidential business information.