N.Y.C. Admin. Code § 24-230: § 24-230 Paving breakers.

(a) No person shall operate or cause to be operated a paving breaker, other than one operated electrically or hydraulically, unless a pneumatic discharge muffler certified by the manufacturer of such muffler to provide a dynamic insertion loss of 5 dB(A) of the sound released from the air discharge of such paving breaker is installed on such air discharge.

(b) No person shall sell, offer for sale for use within the city of New York, operate or permit to be operated a paving breaker that when operated produces a maximum sound level that exceeds 95 dB(A), when measured at a distance of one meter or more from a face of such paving breaker.