The law does not specify what time to start counting nuisance, but regardless of what time, the decibel is too large is a nuisance. If it is a residential, cultural and educational institutions and other areas, 55 decibels during the day, 45 decibels at night, even if it is a nuisance. If it is a residential, commercial, industrial mixed area, 60 decibels during the day, 50 decibels at night, even if it is a nuisance.
Legal basis: "Environmental Noise Pollution Prevention and Control Law" Article 58: One of the following acts, the public security organs to give a warning, and may be fined: (a) the use of high-pitched broadcasting loudspeakers in urban areas in the concentration of noise-sensitive buildings; (b) violation of the provisions of the local public security organs in urban areas in the streets, squares, parks, and other public **** place to organize recreation, gatherings and other activities. The use of sound equipment, produce interference with the surrounding living environment of excessive volume; (3) not in accordance with the provisions of Article 46 and Article 47 of this Law to take measures, from the family indoors to send out serious interference with the surrounding residents living in the environmental noise.