Noise is undesirable sound considered loud, and disruptive to hearing. If we need to raise our voice to speak to someone who is three feet away, the noise level might be over 85 decibels.
A lot of sound measuring devices are used to measure the noise levels in a working place e.g sound level meters, noise dosimeters.
The OSHA has an allowable exposure limit for noise that is an 8-hour time-weighted average (sound levels averaged over an 8 hour day) of 90 decibels (dB) and an action level of 85 dB. It also states that no person should be exposed to noise levels above 115 dB at any time.
Sounds at or lower than 70 dBA is commonly considered safe. Any sound at or higher than 85 dBA may damage your hearing over time.
Damage hearing may show the following signs
- Ringing in ears when leaving work.
- One has to scream to be heard by a colleague arm’s length away
- Experience temporary hearing loss when to leave work
OSHA carry out a hearing conservation program when noise exposure is at or above 85 decibels averaged over 8 working hour.
- Workers working in a pharmaceutical should be safeguarded from noise.
- Workers should be given Protective hearing kits like muffs etc working at or above 85db.
- Should keep a suitable distance from the noisy machine.
- Should change the worker after some time interval.
- Machines should be properly maintained to reduce noise.