Noise is a kind of sound that causes people to be agitated or loud and is harmful to human health.
Noise pollution mainly comes from social noise such as traffic, vehicle horn, industrial noise, building construction, concert hall, tweeter, morning market and people talking loudly.
The physical and psychological damage caused by noise mainly includes the following aspects:
Hearing impairment. Experiments have shown that people's hearing will be impaired after 8 hours of continuous listening to motorcycle sounds; If you are in a rock concert hall, your hearing will be impaired in half an hour.
It is harmful to people's cardiovascular system. The survey of urban noise and residents' health in China shows that the incidence of hypertension increases by 3% for every increase of 1 decibel in regional noise.
It affects people's nervous system and makes people irritable.
Affect sleep and cause fatigue.
What does decibel value mean? The decibel value represents the unit of measurement of sound.
The sound that the human ear can just hear is 0- 10 decibel. Every increase of 1 0dB means that the volume increases by10dB, that is, from1dB to 20dB, which means that the volume increases by100th.
People speak in a low voice about 30 decibels, and speak loudly about 60-70 decibels. A decibel value below 60 is a harmless zone, 60- 1 10 is a transitional zone, and 1 10 is a harmful zone. The car noise is 80- 100 decibels, and the TV sound can reach 85 decibels. Living in a noise environment with 85-90 decibels for a long time, people will get "noise disease". The sound of the chainsaw is 1 10 decibel. The sound of a jet plane is about 130 decibels. When the sound reaches 120 decibels, people's ears will feel pain.