Auditory fatigue appears in the 90 dB region and greatest at 4000Hz. It may be associated with side effects such as whistling and buzzing in the ears. Deafness is the most serious pathological effect. The victum is generally unware of it in early stages. The hearing loss may be temporary or permanent.
Nonauditory effects are interference with speech, annoyance, effeciency and physiological changes.
A variety of approach may be needed control noise. These include :
1. Careful Planning of cities : In planning cities the following measures should be taken to reduce noise-
- division of the city into zones with separation of areas concerned with industry and transport.
- the separation of residental areas from the main streets by means of wide green belts.
- widening of main streets to reduce the level of noise penetration into dwellings.
2. Control of vehicles
3. To improve acoustic insulation of building
4. Industries and railways
5. Protection of exposed persons
6. Legislation
7. Education
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