Noise pollution
“Unwanted or undesired sound or sound without agreeable musical quality is called noise pollution”
Normal audible frequency range 80-1500 Hz
Noise measurement
These are measured in sound pressure level expressed as db
Decibel is relating unit of power and energy on logarthmetic scale
60db is 10 time higher than 70db
80 db is 100 time higher than 60db
Different ranges
| 1) | Conversation | 60db |
| 2) | Street traffic | 70db |
| 3) | Sports car | 80db |
| 4) | Rock and roll band | 120db |
| 5) | Jet plan | 140db |
0db is threshold level of hearing
Effect of noise
1) Interfere in communication
2) Loss of hearing
3) Increases blood pressure
4) It effects nervous system
5) It effects emotion and personality
6) A noise of 85-90 db is danger mark above this range it may cause serious threat for health
7) In Pakistan noise limit is 85 db for 8hr working
Noise measure
1) Restrict use of siren
2) Industries should use sound absorbing materials
3) For safety of workers use ear plugs
4) Reduction the noise level at domestic level
5) Maintained of automobiles
6) Control over vibrations
7) Low voice speaking
8) Prohibit use of loud speaker
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