The harm of noise

Near the airport, hens will not lay eggs; the music played by the band is extremely harsh and can make the audience faint suddenly. These are all caused by noise. From a biological point of view, any unwanted and irritating sound is noise. From a physical point of view, noise refers to sounds with chaotic and irregular sound intensity and frequency. Environmental noise mainly comes from transportation, industrial production, construction and social life. In cities, traffic noise has the greatest impact on residents. The main effects and hazards of noise include: First, it affects hearing. The degree of hearing damage is related to the time of exposure to the noise environment. In a noise environment above 85 decibels, the incidence of noise-induced deafness can reach 5%. Second, it affects study and work and interferes with sleep. In a noisy environment, the doctor's accuracy rate when auscultating patients is only 8%. If the noise reaches 100 to 200 decibels, almost everyone will wake up from their sleep. The third is affecting cardiovascular function and endocrine system. This is mainly manifested in tachycardia, irregular heartbeat, and high blood pressure. Fourth, it harms the central nervous system. In a strong noise environment, symptoms such as headache, tinnitus, dreaminess, memory loss, and general weakness may occur. Fifth, it affects children's intellectual development. Someone has done a survey and found that the intelligence of children in a noisy environment is 20% lower than that of children in a quiet environment.

Tests show that people will suffer from hearing loss after listening to the sound of motorcycles for 8 hours. If you stay in a rock concert for half an hour, your hearing will be damaged, which is harmful to your cardiovascular system. my country's survey on urban noise and residents' health shows that for every decibel increase in regional noise, the incidence of hypertension in the region increases by 3%. Noise is responsible for 3 out of 4 cases of neurosis in France. Noise is responsible for 35% of suicides in Paris and Tokyo. A further 35% of crime-related crimes are related to noise. Different noises have different effects on people. For example, intermittent noise has a greater impact on people than continuous noise. Noise at night has a greater impact than noise during the day. The noise from home appliances affects people's sleep quality and quantity, which in turn affects people's work efficiency and has adverse effects on health. According to statistics, 84% of the population in the United States is severely disturbed by noise, and 20% of the population is under the threat of hearing damage from strong noise.

Through a series of examples, we can see that noise is increasingly affecting our lives, work, and study, and can even cause social conflicts and cause economic losses. Noise control is very important. We can do a small experiment: there are two classes of students, one class A is set up in a noisy environment, and the other class B is set up in a quiet environment. Everyone learns the same course together, with the same teacher. Under the guidance of the teacher, after a month of study, you will find that the listening efficiency of Class A is far less than that of Class B. What is the reason for this? The results reflected in the above experiments are very obvious. Noise can cause great damage to human hearing. Noise is widely affecting people's various activities. In the past, people often regarded deafness as a common disease of the elderly, but scientific experiments have proved that people are not necessarily deaf when they are old, but noise is an "invisible killer" that causes people's hearing to weaken or even become deaf. It can be seen that noise is very harmful to us, so it is urgent to understand the harm of noise and stop it.