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THE disturbance produced in the environment due to undesirable and harsh sounds from various sources is called sound pollution.

sources of noise are :
1. noise in homes.
2. noise in surroundings.
3. noise in factories.
4. noise due to transportation.

harmful effects:
1. it causes anger and tension.
2. it produces headache and irritatibility.
3. it may result in the loss of hearing.

methods of prevention:
1. all automobiles should be provided with silencers.
2. heavy vehicles should not enter residential areas.
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