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Sounds above what level are considered hazardous noise pollution?

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Sounds above what level are considered hazardous noise pollution?
A. above 30 dB
B. above 80 dB
C. above 100 dB
D. above 120 dB
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Noise pollution is measured in decibels. Noise level up to 64 dB is well tolerated. Noise above 80 dB causes discomfort in man. WHO recommends an industrial noise limit of 75 dB.
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