Sound becomes hazardous noise pollution at level a) Above 30 dB b) Above 80 dB c) Above 100 dB d) Above 120 dB.

Sound becomes hazardous noise pollution at level a) Above 30 dB b) Above 80 dB c) Above 100 dB d) Above 120 dB.
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Answer :

b) Above 80 dB
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