N.Y. Comp. Codes R. & Regs. tit. 6, § 621.2
(i) Delegated permit means a permit issued by the department for which a comparable permit may be required by Federal law. Delegated permits include those for which the department has been delegated the authority to make permit decisions on or for which the State's regulatory program has been approved by the United States Environmental Protection Agency pursuant to Federal law. For the purposes of this Part the term delegated applies to permits issued by the department for the following programs:
(3) Clean Air Act (CAA) amendments, 42 United States Code 7401 et seq., (see section 200.9 of this Title) for any air pollution control source under ECL article 19 subject to any of the following Federal requirements: