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Dr K K Aggarwal

Some facts on noise levels

By Dr K K Aggarwal
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  • Continuous exposure to sounds above 85 db can cause progressive hearing loss. Anyone exposed to sounds above 85 db of noise requires hearing protection.
  • The special limit for people who are exposed to noise above 90 db is 8 hours, for 95 db is 4 hours and 2 hours for 100 db.
  • A short blast of loud sound also can cause severe to profound sensory neural hearing loss and pain. This usually involves exposure to noise above 120-155 db. Hearing protection in the form of muffins or ear plugs is highly recommended anytime a person is exposed to loud noise.

Noise standards

By Dr K K Aggarwal
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The ambient noise standard for residential areas is 55 decibel dB during the day and 45 dB at night. Permissible noise in industrial area is 75 dB in daytime and 70 dB in nighttime. Permissible noise in commercial area is 65 dB in daytime and 55 dB in nighttime. Permissible sound in residential area is 55 dB in daytime and 45 dB in nighttime. Permissible sound in silence zone is 50 dB in daytime and 40 dB in nighttime. Day time shall mean from 6am to 10 pm and nighttime shall mean from 10 pm to 6am. Silence zone are areas up to 100 m around hospitals educational institutions and courts. One can complain to the authorities if the noise levels exceed from the allowable limit by more than 10dB. High noise levels lead to stress related dysregulation of the autonomic system leading to high blood pressure and heart disease.