1, category 0 (refers to the special need for quiet residential areas, such as rest and recuperation areas, high-level villa areas, high-level hotel areas, etc.) daytime limit of 50 decibels, the night limit of 40 decibels;
2, category 1 (applicable to residential, cultural and educational institutions mainly in the area. Rural residential environment can refer to the implementation of the standards in this category) daytime limit of 55 dB, the night limit of 45 dB;
3, category 2 (for residential, commercial, industrial mixed areas) daytime limit of 60 dB, the night limit of 50 dB;
4, category 3 (for industrial areas) daytime limit of 65 dB, the night limit of 55 dB;
5, category 4 (for urban road traffic arteries) In the city on both sides of the road traffic arterial road area, through the city on both sides of the inland waterway area. Through the urban areas of the railroad on both sides of the main and secondary trunk line of the background noise (refers to the noise level when the train does not pass) limits also implement the standards of this category) limit of 70 dB during the day, the night limit of 55 dB.
Noise is usually harmful to the human body in the following aspects:
1, a serious impact on the central nervous system function, resulting in neurological weakness and dysfunction of the nervous system, such as long-term in the noise will lead to insomnia, dreamy, rest and sleep conditions are poor, or the quality of rest and sleep deterioration, the appearance of a shortening of the phase of deep sleep, the prolongation of the phase of light sleep, or neurological headaches, Migraine, insomnia, sleeplessness and other clinical symptoms and performance;
2, the symptoms of insufficient blood supply to the heart, long-term noise hazards will lead to coronary artery ischemia and transient vasospasm, which will appear chest tightness, shortness of breath, palpitations, precordial discomfort, etc.;
3, the noise will also be on the ear canal and the auditory system causing irreversible damage, such as leading to neurotic tinnitus and even the onset of neurological deafness.
"The Chinese people *** and the State Environmental Noise Pollution Prevention and Control Law" Article 45 prohibits any unit or individual in the urban areas of noise-sensitive construction in the concentrated area of the use of high-pitched broadcasting loudspeakers. In urban urban streets, squares, parks and other public **** place to organize entertainment, assembly and other activities, the use of audio equipment may produce interference with the surrounding living environment of excessive volume, must comply with the provisions of the local public security organs.