Noise level that describes the size of the noise level classification, the noise level of 30 to 40 decibels is relatively quiet normal environment, more than 50 decibels will affect sleep and rest. 70 decibels or more to interfere with the conversation, affecting the efficiency of the workplace, and even accidents, long-term work or live in a noise environment of more than 90 decibels, will seriously affect the hearing and lead to the occurrence of other diseases.
The decibel is the unit of sound pressure level, which is recorded as d B . It is used to indicate the size of a sound.1 A decibel is about as loud as a person can just feel. A suitable living environment should not exceed 4.5 decibels and should not be less than 1.5 decibels.
According to ordinary human hearing 0 to 20 decibels is very quiet, almost can not feel, 20 to 40 decibels of quiet, as if the whisper, 40 to 60 decibels of ordinary indoor conversation, 60 to 70 decibels of noisy, damaged nerves,
70 to 90 decibels of very noisy, nerve cell damage, 90 to 100 decibels of noisy intensification of the hearing damage.
Noise control includes:
1, control noise sources. Reduce the noise of the source, industry, transportation industry can choose low-noise production equipment and improve the production process, or change the movement of the noise source;
2, blocking the noise propagation. Reduce noise in the transmission path, control the propagation of noise, change the sound source has been issued by the noise transmission path, such as the use of sound absorption, sound insulation, sound barriers, vibration isolation and other measures, as well as rational planning of urban and architectural layout, etc.;
3, in the human ear to attenuate the noise. Noise protection of the recipient or the recipient organ, in the sound source and transmission pathway can not take measures, or take the acoustic measures still can not achieve the desired effect, it is necessary to the recipient or the recipient organ to take protective measures, such as long-term occupational noise exposure of the workers can wear earplugs, ear muffs or helmets and other ear protectors.
Legal basis
"The Chinese People's **** and the State Environmental Noise Pollution Prevention and Control Law"
Article 40 In addition to takeoff, landing, or the circumstances prescribed by law, civil aircraft shall not fly over the urban area of the city. The people's government of a city shall delineate an area around the clearance for take-off and landing of aircraft to restrict the construction of noise-sensitive buildings; where noise-sensitive buildings are constructed within such an area, the construction unit shall take measures to mitigate and avoid the impact of the noise generated by the operation of the aircraft. The civil aviation department shall take effective measures to mitigate environmental noise pollution.