The National Institute on Deafness and Other Communication Disorders (NIDCD) notes that exposure
of just one minute to sounds of 110 decibels or higher can damage your hearing. No more than 15 minutes of unprotected exposure is recommended for noises of 100 decibels, as well as several hours exposure to noises of 90 decibels or higher. Here's the decibel level of some common noises:
- 140 decibels: rock concerts, firecrackers
- 120 decibels: boom cars, snowmobiles
- 110 decibels: chain saw
- 100 decibels: woodshop
- 90 decibels: lawn mower, motorcycle
- 80 decibels: city traffic noise
- 60 decibels: normal conversation
- 40 de ibels: refrigerator humming
- 20 decibels: whispered voice
- 0 decibels: threshold of normal hearing
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