Brooklyn, Bronx, Queens, Staten Island and Manhattan Quiet Hours
Quiet Hours in all five boroughs of New York City, as specified in Local Law 113, are from 10 p.m. until 7 a.m. Reasonable noise levels are expected at all times.
The code was amended in 2007 due to increasing problems with noise control in the City. It now reads:
It is hereby declared to be the public policy of the city to reduce the ambient sound level in the city, so as to preserve, protect and promote the public health, safety and welfare, and the peace and quiet of the inhabitants of the city, prevent injury to human, plant and animal life and property, foster the convenience and comfort of its inhabitants, and facilitate the enjoyment of the natural attractions of the city. It is the public policy of the city that every person is entitled to ambient sound levels that are not detrimental to life, health and enjoyment of his or her property. It is hereby declared that the making, creation or maintenance of excessive and unreasonable noises within the city affects and is a menace to public health, comfort, convenience, safety, welfare and the prosperity of the people of the city.
The code goes on to say:
No person shall make, continue or cause or permit to be made or continued any unreasonable noise … Unreasonable noise shall include but shall not be limited to sound, attributable to any device, that exceeds the following prohibited noise levels:
(1) Sound, other than impulsive sound, attributable to the source, measured at a level of 7 dB(A) or more above the ambient sound level at or after 10:00 p.m. and before 7:00 a.m., as measured at any point within a receiving property or as measured at a distance of 15 feet or more from the source on a public right-of-way.
(2)Sound, other than impulsive sound, attributable to the source, measured at a level of 10 dB(A) or more above the ambient sound level at or after 7:00 a.m. and before 10:00 p.m., as measured at any point within a receiving property or as measured at a distance of 15 feet or more from the source on a public right-of-way.
See a summary of the noise code here: http://nyc.gov/html/dep/pdf/noise_code_guide.pdf
And the full code here: http://nyc.gov/html/dep/pdf/law05113.pdf