EPA is taking direct final action to approve Allegheny County Health Department's (ACHD's) request for delegation of authority to implement and enforce its hazardous air pollutant regulations which have been adopted by reference from the Federal requirements set forth in the Code of Federal Regulations. This approval will automatically delegate future amendments to these regulations. For sources which are required to obtain a Clean Air Act operating permit, this delegation addresses all existing hazardous pollutant regulations. For sources which are not required to obtain a Clean Air Act operating permit, this delegation presently addresses the hazardous air pollutant regulations for perchloroethylene drycleaning facilities, hard and decorative chromium electroplating and chromium anodizing tanks, ethylene oxide sterilization facilities, halogenated solvent cleaning, secondary lead smelting, hazardous waste combustors, portland cement manufacturing, and secondary aluminum smelting. This delegation addresses all sources subject to the accidental release prevention regulations. In addition, EPA is taking direct final action to automatically delegate all future hazardous air pollutant regulations which ACHD adopts unchanged from the Federal requirements. EPA is not waiving its notification and reporting requirements under this approval; therefore, sources will need to send notifications and reports to both ACHD and EPA. This action pertains to affected sources, as defined by the Clean Air Act's (CAA's or the Act's) hazardous air pollutant program, as well as covered processes, as defined by the Act's chemical accident prevention provisions. EPA is taking this action in accordance with the CAA.