N.Y.C. Admin. Code § 24-147: § 24-147 Emission of nitrogen oxides.

(a) No person shall cause or permit the use or operation of fuel burning equipment that is covered by subpart 227-2 of part two hundred twenty-seven of title six of the New York codes, rules and regulations in a manner inconsistent with the requirements regarding emission limits for nitrogen oxides set forth in such subpart.

(b) The commissioner may establish rules regulating nitrogen oxides emissions from boilers not regulated under subpart 227-2 of part two hundred twenty-seven of title six of the New York codes, rules and regulations.