This action finalizes amendments to the national emission standards for hazardous air pollutants (NESHAP) for the site remediation source category. This action finalizes amendments to remove exemptions from the rule for site remediation activities performed under authority of the Comprehensive Environmental Response, Compensation, and Liability Act (CERCLA) as a remedial action or a non-time-critical removal action, and for site remediation activities performed under Resource Conservation and Recovery Act (RCRA) corrective actions conducted at treatment, storage, and disposal facilities. This final rule is effective on 22 December 2022. POC is Matthew Witosky, Sector Policies and Programs Division (E143-05), Office of Air Quality Planning and Standards, EPA, Research Triangle Park, North Carolina 27711; tele: (919) 541-2865; and email:witosky.matthew@epa.gov.(Federal Register 22 December 2022 [Rule] pages 78545-78558)