Noise pollution poses a hazard to people, animals, instruments, and buildings. The degree of harm depends on the frequency, intensity, and exposure time of the noise. The noise hazards mainly include: (1) Noise damage to hearing
The most direct hazard to humans from noise is hearing impairment. When people enter a strong noise environment for a period of time, they will feel uncomfortable on their ears and may even experience headaches. After a period of rest from a noisy environment to a quiet place, hearing will gradually return to normal. This phenomenon is called temporary hearing threshold deviation, also known as hearing fatigue. However, if people work long-term in a strong noise environment, auditory fatigue can not be restored in time, and the inner ear organs will produce a qualitative lesion, which will form a permanent hearing threshold shift, also known as noise deafness. If a person is suddenly exposed to an extremely strong noisy environment, the auditory organs will undergo rapid trauma, causing rupture of the tympanic membrane, hemorrhage of the labyrinth, and acute detachment of the spiral from the basement membrane, which may cause the person's ears to completely lose hearing, that is, violent deafness.
Studies have shown that noise pollution is an important cause of senile deafness. In addition, the hearing impairment is also related to the living environment and occupations. For example, the incidence of deafness in rural areas is lower than that in urban areas. Textile workers, forgers and blacksmiths have more hearing impairments than their peers.
(2) Noise can induce many diseases
Because noise acts on the central nervous system of the brain through the auditory organs, which affects all organs of the body, noise, in addition to damage to human hearing, can also cause harm to other systems of the human body. Due to the effects of noise, symptoms such as headaches, brain swelling, tinnitus, insomnia, general fatigue, and memory loss may occur. The incidence of hypertension, arteriosclerosis, and coronary heart disease is 2-3 times higher in those who work in a high-noise environment for a long period of time than in a low-noise environment. Visible noise can cause cardiovascular disease. Noise can also lead to dysfunction of the digestive system, causing indigestion, loss of appetite, nausea, and vomiting, which can increase the incidence of gastrointestinal and ulcer diseases. In addition, noise also has some influence on the visual organs, endocrine function and the normal development of the fetus. People who work and live in high noise generally decline their levels of health year by year, weaken their resistance to the disease, and induce some diseases, but they are also related to individual physical factors and cannot be generalized.
(3) Noise interference with normal life and work
Noise has a great impact on people's sleep. Even when a person is sleeping, hearing must withstand noise stimulation. Noise can lead to more dreams, easier wakening, decreased sleep quality, etc. The sudden noise has a more pronounced effect on sleep. Noise can interfere with people's conversation, work, and study. Experiments have shown that when people are disturbed by sudden noise, they lose 4 seconds of ideological concentration. According to statistics, noise will reduce labor productivity by 10 to 50%. With the increase of noise, the error rate will increase. It can be seen that noise can distract people's attention, leading to unresponsiveness, fatigue, reduced work efficiency, and increased error rate. Noise also masks safety signals, such as alarm signals and vehicle traffic signals, causing accidents.
(4) Impact of noise on animals
Noise can cause pathological changes in the auditory organs, visual organs, internal organs, and central nervous system of animals. Noise has a certain influence on the animal's behavior. It can cause the animal to lose its ability to control behavior, appear irritated, and lose normality. Strong noise can cause the animal to die. Birds in the noise will appear feather off, affecting the spawning rate.
(5) Harmful noise on equipment and building structure
Experimental studies have shown that exceptionally strong noise can damage the instrumentation and even cause the instrumentation to fail. The influence of noise on the instrument and equipment is related to noise intensity, frequency, and the structure and installation method of the instrument and equipment itself. When the noise level exceeds 150dB, components such as resistors, capacitors, and transistors will be seriously damaged. When the extraordinarily strong noise acts on mechanical structures such as rockets and astronauts, due to the repeated action of alternating alternating loads, the material will cause fatigue and break, and this phenomenon is called acoustic fatigue.
General noise has little effect on buildings, but when the noise level exceeds 140dB, it begins to have a destructive effect on light buildings. For example, when a supersonic aircraft flies at low altitudes, sudden changes in pressure and density will occur at the head and tail of the aircraft. After reflection on the ground, an N-shaped shock wave will form. When it passes to the ground, it will sound like an explosion. This particular noise is called a boom. . Under the effect of booming, buildings will be damaged to varying degrees, such as door and window damage, broken glass, cracked walls, falling plaster, and collapsed chimneys. Due to the slow decay of the boom, it spreads far and has a wide range of influence. In addition, the use of air hammers, piling or blasting near buildings can also cause damage to buildings.
Noise is a type of sound that causes people to be irritable, or whose volume is too strong to harm human health. Noise pollution mainly comes from transportation, vehicle whistle, industrial noise, construction, social noise such as concert halls, tweeters, morning markets, and people's loud voices.
Experience talking glass window door
Wire Stainless Steel Product.
China Kitchen Rack,Sink Grid,Stainless Mesh Storage Baskets,Kitchen Wire Storage, we offered that you can trust. Welcome to do business with us.
Kitchen Rack is made of high quality 304 stainless steel, This kind of material steel luxury, never rust, resist corruption, easily clean, safe, healthy and durable. Prevent rust or chemicals from contaminating food and damaging health
Kitchenware,Bread basket,dish rack,cutting board rack,Sink Grid,dish drying rack
Shenzhen Lanejoy Technology Co.,LTD , https://www.brassinsert.net