Noise Pollution

Noise Pollution
The process of obtaining an acceptable noise environment is called Noise control .
The increase in noise level due to Industrial development and many other human actions is called noise pollution.
Different countries passed legislation and started creating regulations to control noise pollution.
Noise pollution affects the operators of machines and vehicles. It also affects occupants of buildings in which machines are installed.
Sound is a three-dimensional wave motion in the atmosphere. The acoustic waves travel from the source with a speed independent of their amplitude . This speed is dependent on the acoustic medium. The speed of sound c is 1117 ft/s (343 m/s)
Noise Sources
Aircraft noise
The main sources of noise are
1) Surface transportation noise,
2) Aircraft noise,
3) Industrial noise,
4) Noise in the community from industrial and construction sites,
5) At home.
Surface transportation noise
Sources of this noise:
1)road traffic,
2)railways,
3)off-road vehicles,
4)ships,
Aircraft noise It occurs only around major airport. It is local and more easily identifiable, it seems to receive more attention. Most of the noise is produced by scheduled airlines; Large number of light aircraft produce less noise.
In Delhi, capital of India, Residents of Vasant Vihar colony are agitating against the Noise Aircrafts at Delhi Airports. Traffic and aircraft noise which are very annoying problem, 
Industrial noise
Industrial noise is a widespread in the industrial cities. Exposure to industrial noise can cause permanent hearing damage.



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