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write article on noise pollution – an un necessary threat ​

Answer 1

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Answer 2

Noise pollution

Noise pollution is a serious threat to the quality of man's environment. Noise, by definition, is over-loud or disturbing sound.Sound levels are measured in decibels (dB). It is a unit for expressing the relative intensity of sound on a scale from 0 to 130.

Noise is unwanted sound and has become a part of urban life and industrial centres in this century. Noise pollution may come from loudspeakers, factories, aeroplanes, moving trains, construction activity or even a radio.

Noise level of 80 decibels or more for more than 8 hours a day increases tension and changes in breathing patterns. Continued exposure to high levels of noise results in fatigue, hearing loss or even total loss of hearing, changes in blood circulation, changes in breathing, etc. Noise pollution above 120 decibels can cause many adverse biochemical changes. Cholesterol levels in the blood and white cell counts increase, besides causing hypertension.

Effects of Noise Pollution

• Even short exposure to noise can produce temporary hearing losses.
• Prolonged exposure to noise can lead to a gradual deterioration of the inner ear and subsequent deafness.
• Constant noise causes the blood vessels and muscles to contract. This causes a gradual loss of hearing, tension, nervousness and psychiatric illness. High intensity sounds emitted by many industries and supersonic aircraft, when continued for long periods of time not only disturb but also permanently damage hearing.
• Noise has harmful effects on non-living materials too. Numerous examples can be cited where old buildings and even new constructions have developed cracks under the stress of explosive sounds.

Sources of Noise

The major sources of noise are

• Use of Television and Radio
• Railways
• Use of loudspeakers
• Industrial activities
• Aircraft

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