Everyone knows that people do not need the sound is called noise. The city's noise sources are transportation, industry, construction, life noise.
For their health, the permissible noise is 70 to 90 decibels, to ensure the mental conditions for 40 ~ 60 dB, rest and sleep for 30 to 42 db. China has formulated the "Urban Regional Environmental Noise Standards", will be divided into five regional.
0 class: 50 dB day-night 40 dB, a special quiet area. Class 1: Day 55 decibels, 45 decibels night, residents cultural and educational area. Two categories: Day 60 decibels at night 50 dB, residents mixed area. Three categories: Day 65 decibels at night 55 decibels, industrial zones. Four categories: Day 70 decibels at night 55 decibels, traffic trunk area.
Noise is a kind of environmental pollution, strong noise, hearing-impaired people, this damage is cumulative, like Dishuichuandan. According to newspaper reports, Germany has 12 million ~ 15 million people suffering from hearing loss, 6 million to 800 million people ringing in the ears. The human ear can not be like the eye, as close together, even in sleep, the hearing also disrupted many long years of noise-induced hearing disorders.
Can be seen that for their own and others health, everyone should consciously reduce the noise, such as whisper, not loud noise; chaos sounded his horn; civilized construction. In addition, the sound source should be used for different sound absorption, sound insulation, noise elimination, vibration isolation, noise barriers and other technical means. Do not build residential buildings along the street; should be more planting trees and grass and so on.

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