How to define the scope of hearing protection and carry out occupational hazards on noise

Netizen Zeng Zejun: The company is a production line assembly and assembly industry. Its production site is a 20,000 square meter large bay production plant. There are occupational hazards with noise exceeding 85 dB(A) in a few operating positions. How to define the scope of hearing protection and conduct noise Occupational hazard checkups are as follows:
1. All assembly employees must include a pure hearing test at the entrance examination. Do managers who often go to the production workshop to check work (one hour each morning and afternoon) must perform a physical examination or establish a listening basic line?
2. It is no problem to include posts above 85dB(A) into the scope of hearing protection. Can the position below 85dB(A) be excluded from hearing protection? If not, what position is greater than ?dB(A) must be included in the scope of hearing protection?
3. Does the occupation within the scope of hearing protection carry out a noise and occupational hazard check every year, or does the occupation above 85dB(A) conduct an annual noise occupational hazard check?
4. Noise Occupational hazards There are several items for physical examination. Is it possible to only perform pure hearing tests? Are other medical examination items similar to the regular (2 year) medical examinations of general employees? Can they be replaced?
5. What is the risk of a professional occupational health inspection agency requesting an occupational health examination? If the company does not do this assessment?

Expert reply

Li Xiaokuan (Chief Researcher, Professional Committee of Noise and Vibration Control, Chinese Occupational Safety and Health Association)

This question is not clear about the current status of noise in the factory. It only mentions that the noise in certain operating positions exceeds 85dB(A). Therefore, some questions cannot be answered in a targeted manner.

The amount of evaluation dB(A) involved in the hearing protection program is 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. The inspectors should consider whether sound exposure is needed at different times to consider whether they need to be included in the scope of hearing protection.

The requirements for the protection of employees in industrial enterprises require LAeq, an enterprise with 8 ≥ 85 dB to implement this specification, and the requirement of <85 dB is not required.

Employees engaged in work at LAeq, 8≥85dB site for the first time, should receive a hearing test within 3 months and the resulting audiogram is called the basic audiogram. Employees exposed to noise workplaces with 85 dB ≤ LAeq and 8 <100 dB should conduct audiometric measurements every two years. Exposure to LAeq, 8 ≥ 100 dB, should be followed up once a year.

The main physical examination items involving hearing protection are hearing tests, using pure tone air conduction. The test frequency should include at least 500, 1000, 2000, 3000, 4000 and 6000 Hz.

The fifth question cannot be answered because my job is not involved.

Suggestion: If possible, the company should develop a hearing protection plan and master the noise characteristics of the company's noise sources, noise transmission routes and reception sites, including noise emission, noise exposure and noise exposure measurements. According to the actual situation of the enterprise, implementation of reasonable and feasible Sound source control, propagation route control and receiving position protection measures effectively control the impact of workplace noise on the health of employees.

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