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Friday, October 17, 2014


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Sound without value is called as noise. It is the sound which is undesired by the recipient. Noise interferes with communication, relaxation, leisure, heartbeat, eardrum and mental conditions. It is very harmful to sick persons and students on their studies. Hence, noise is considered as serious pollutant which spreads through air.

Pressure horns of cars and other vehicles, noise produced through loud speakers during social and religious functions, noise produced by heavy machines, irresponsible practice of hearing high pitched sound of music systems, televisions etc. are some remarkable sources of noise pollution.

The popular unit of sound measurement is decibel (db). This unit has been named after Sir Alfred Bell. The human ear is sensitive to sound from 0 to 180 db. However, the sound beyond 140 db is harmful

Key Words: noise pollution, horns, db,

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