What are the best ways to mitigate noise hazards?

Netizen Pan Xingfeng: Experts and teachers are good. The place where my mother works is very noisy. There are also protective ear plugs in the factory. However, because of work, I basically don’t wear it. Is there any other way to reduce the noise hazard? For example, there are good ways to go after work. Thank you, looking forward to your reply.

Expert reply

Li Xiaokuan (Researcher of the Professional Committee on Noise and Vibration Control of the Chinese Occupational Safety and Health Association):

There is no specific description of the noise in the workplace, nor does it mention the reason for not wearing protective earplugs (the reason for the work is not specific), so it is impossible to give a targeted explanation and only general questions can be given.

In addition to direct damage to human hearing, noise is basically indirect to other people, and it takes time to accumulate.

Hearing protection involves the evaluation of the equivalent sound level exposed for 8 hours per working day. This amount is, in a sense, an average of energy. The integral sound level meter or sound exposure meter can be used to measure, and can also be calculated by different sound levels corresponding to different time periods. Through research and research on noise-induced hearing loss by a large number of scholars and research institutes at home and abroad, the occupational noise exposure standard is set at 85dB(A), which ensures that the hearing of over 90% of working workers is not affected by the noise of the workplace. Most countries in the world have adopted this standard. Based on this, the contact time is halved and the noise is allowed to increase by 3dB (A). The maximum allowable value is 115 dB (A).

Generally, a comprehensive assessment shall be made of the noise situation in the workplace, including the noise exposure in the workshop (all noises transmitted to a certain job site) and the noise exposure of the employees (the noise accepted by the human ear within the specified time). Excess areas with noise exposure and people with excessive noise exposure.

Through the measurement of the environmental noise exposure value, the harm situation of the workplace noise can be determined. For areas with excessive noise, timely noise control, noise reduction through sound insulation, sound absorption, noise reduction, vibration isolation and other engineering techniques.

Through the measurement of human noise exposure, determine the level of hearing protection it needs, and select suitable ear protectors for those exposed to high noise. Operators should raise their awareness of protection. When exposed to a noisy environment, consciously and correctly use ear protectors to protect their hearing. At the same time, it is also possible to reduce the exposure of personnel by adopting methods such as shift work, job position exchange, and process adjustment through the means of exposure time management of workers. According to the principle of equal energy, every time the noise exposure increases by 3dB, the working time is reduced by half. The reasonable arrangement of working hours and the use of ear protectors can reduce noise exposure.

In the face of a noise pollution problem, the control is usually considered from three aspects: one source noise control (the most fundamental solution); two noise transmission path control (the most commonly used solution); three receivers individual protection (most direct The solution to this problem is that when the noise control of the current two aspects cannot be implemented, the third link is the last line of defense for hearing protection and the ear protectors must be properly used.

It is suggested that the comrade’s mother should understand the noise status of her work environment to determine whether hearing impairment will be caused, and at the same time understand which steps the unit may use to reduce noise. I can therefore reduce the noise exposure. If the noise exceeds the standard, the unit will not To take control measures to reduce noise, individuals must use the ear protectors correctly, and should avoid the high-noise environment in daily life after work.

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