Noise pollution on people, animals, instruments and meters, and buildings are a hazard, the harm degree mainly depends on the frequency and intensity of noise and exposure time. Noise level is 30 ~ 40 decibels quieter in the normal environment; More than 50 decibels can affect sleep and rest. Due to lack of rest can’t eliminate fatigue, can affect the normal physiological function will be affected by; Talk to over 70 decibels interference, cause upset, lack of concentration, affect work efficiency, and even accidents; Long-term work or live in to over 90 decibels of noise environment, will seriously affect the hearing and cause other diseases.
1. The interference of language communication
The influence of noise on language communication, from the influence of noise on hearing. This kind of influence, light to reduce the communication efficiency, heavy damage people’s language listening. Studies show that 30 decibel belongs to very quiet environment, such as studio, hospitals should satisfy this condition. 40 decibels is normal environment, such as general office should keep this level. 50 to 60 decibels belong to the noisy environment, mental work at this time, conversation and interference. When the call, the surrounding noise of 65 decibels dialogue is difficult; At 80 decibels, is can’t hear clear. In 80-80 decibels, distance is about 0.15 meters also had to raise his voice to a dialogue. If the noise decibels high again, actually could not have a dialogue.
2. The impact on the people listening
Damage to people’s hearing. Noise is the most direct harm to the human body hearing impairment. It can cause temporary body and persistence hearing impairment. Also said that acute and chronic injury. Short-term noise damage hearing person is in noisy environment, contact with strong noise and exposed to a period of time, will feel your ears uncomfortable, can appear tinnitus, hearing loss, and even there will be a headache. Even leave the noisy environment, the ear can cause hearing loss in short-term, but as long as the time is not long, when back to the quiet environment, namely can recover after a short time. This phenomenon is called auditory adaptation. However, if a long time without protection work in the strong noise environment, leaving the noise environment after hearing sensitivity of recovery will be extended, after several hours or more than ten hours, hearing can be restored. This can recover the hearing loss is called temporary threshold shift, also known as the auditory fatigue. And people work in strong noise environment, has been contact with strong noise, the hearing continues to decline, noise can cause hearing loss, as the deterioration of the auditory fatigue will cause the auditory function recovery. Auditory fatigue can’t get back in time, and the inner ear organ implement qualitative sex pathological change, will happen become pathological change. That form a permanent auditory threshold shift, also called noise deafness. If a person who suddenly exposed to an extremely strong noise environment, auditory organs sharp injury occurs, the eardrum rupture bleeding, bleeding, lost corti from acute stripping basement membrane, may make the ear completely lost his hearing, namely, appear BaoZhen deafness. Further development course of the disease, such as, listening curve will continue to fall, hearing loss, on average, more than 25 decibels, there will be a language hearing abnormal, subjective feeling session with difficulty, is called noise deafness. In addition, powerful sound critical, such as explosions and gunfire, can cause acute BaoZhen deafness, tympanic membrane rupture, middle ear small ear ossicle displacement, torn ligament, bleeding, partial or total loss of hearing. Subjective symptoms have ear pain, dizziness, headache, nausea and vomiting. Studies have shown that noise pollution is an important cause of presbycusis. In addition, the hearing damage is also associated with the environment and the career of life, such as rural presbycusis incidence is lower than city, textile workers, blacksmith, and blacksmiths and hearing loss more than their peers.
Therefore, to prevent noise deafness in the first place to prevent the occurrence of fatigue. In general, below 85 db noise unapt harm hearing, while 85 decibels may be dangerous. Statistics show that working for a long time in 90 decibels of noise environment, obviously increase the incidence of deafness.