The state stipulates that any person who operates for more than 8 hours in a working environment with a noise level of more than 85 decibels must wear earplugs (anti-noise earplugs) or soundproof earmuffs to protect our hearing.

The following types of noise in the production process can cause hearing damage:

1) Mechanical noise: noise generated by mechanical impact, friction, solid vibration and rotation, such as the sound produced by chainsaws, machine tools, and rock crushers;

2) Aerodynamic noise: Noise due to air vibrations, such as sounds from ventilators, air compressors, ejectors, sirens, and boiler exhausts;

3) Electromagnetic noise: noise due to alternating forces in the motor. Such as generators, transformers sound.

This shows that in most industrial environments we all need to wear soundproof earplugs (noise-proof earplugs) or soundproof earmuffs to protect our hearing.

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