Sound above what level (in decibels) is considered hazardous noise pollution ?

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Q: 14 (UPPSC/2013)
Sound above what level (in decibels) is considered hazardous noise pollution ?

question_subject: 

Science

question_exam: 

UPPSC

stats: 

0,23,43,5,16,22,23

keywords: 

{'hazardous noise pollution': [0, 0, 0, 1], 'decibels': [1, 1, 0, 1], 'level': [1, 0, 0, 1]}