The sounds that affect normal work and life are collectively called noise. Noise is not necessarily the high decibel, and noise is definitely not the low decibel. For example, if you watch a movie on TV, the decibel value of the sound is very high, often exceeding 90 decibels, but it can't be called noise for the people who watch the movie. However, if the sound insulation effect of electricity is not good, the sound will be transmitted to nearby residential buildings, and it may be only 50 decibels after attenuation, but it is noise for people in the house, because this sound will cause discomfort.

The following are the reference values of human hearing tolerance: 44 decibels-acceptable level; 55 decibels-I feel a little annoyed; 60 decibels-no drowsiness; 70 decibels-making people nervous; 85 decibels-covering your ears is unacceptable; 100 decibel-can make your ears temporarily lose hearing; 120 db-can instantly pierce your eardrum; 160 dB- broken glass; 200 decibels-causing death. A decibel value below 60 is a harmless zone, 60- 1 10 is a transitional zone, and 1 10 is a harmful zone. This shows how harmful noise is to human body!

Noise pollution mainly comes from car horns, industrial noise, building construction, concert halls, speakers, loud noises and so on. Most of them are man-made. Therefore, as long as everyone is civilized, some noises can be reduced, such as car horns, loud talking and industrial noise. ...

As the saying goes, "there is' noise' above and' silencing' below." Smart people have also come up with many ways to deal with it, such as: inventing sound insulation glass, planting a variety of flowers indoors, and putting a "protective layer" on your ears-earplugs ... There are many ways to deal with noise.

Of course, the best way is to "uproot", so as to eliminate noise permanently and effectively.

Grade 5: Sun Jingjing.