How long is a dBA reading safe?
If Honest Decibel shows a loud reading, the next question is time: is this a brief check, a whole shift, a concert, or headphones for hours? Use this page to compare the reading with common NIOSH and OSHA exposure-time references.
Boundary: this is an educational reference for quick awareness checks. It is not medical, legal, workplace-compliance, or hearing-conservation advice. Phone meters are not certified Type 1 or Type 2 instruments.
Measure with Honest Decibel ↗Fast answer
NIOSH uses an 85 dBA / 8-hour recommended exposure limit and a 3 dB exchange rate, meaning every 3 dB increase roughly halves the recommended exposure time. OSHA's older permissible exposure limit starts at 90 dBA / 8 hours with a 5 dB exchange rate. That is why the same reading can look more conservative under NIOSH than under OSHA.
NIOSH, more protective
- 85 dBA: about 8 hours
- 88 dBA: about 4 hours
- 91 dBA: about 2 hours
- 94 dBA: about 1 hour
- 100 dBA: about 15 minutes
OSHA PEL, legal baseline
- 90 dBA: 8 hours
- 95 dBA: 4 hours
- 100 dBA: 2 hours
- 105 dBA: 1 hour
- 110 dBA: 30 minutes
How to use this with Honest Decibel
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Measure from the place your ears actually are
Open Honest Decibel, tap Start, and hold the iPhone near where your head normally is. Do not cover the microphone.
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Use the steady level, not one spike
Watch the reading for 20 to 60 seconds. A single dropped glass or shout is different from a steady 95 dBA room.
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Match the reading to time
At 85 dBA, NIOSH's reference is roughly a full workday. At 100 dBA, the more protective NIOSH table is roughly minutes, not hours.
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Escalate when decisions matter
If you are making workplace, legal, lease, medical, or hearing-conservation decisions, use certified measurement methods and qualified professionals. Honest Decibel is a quick awareness meter, not evidence by itself.
Common scenarios
Concerts and clubs
Concerts can sit in the 95 to 110 dBA range, depending on venue, position, and sound system. If you see sustained readings near 100 dBA, think in short exposure windows and use ear protection. See also our concert decibel guide.
Headphones and AirPods
Daily headphone exposure is cumulative. A reading that feels tolerable can still be too much for hours. Pair this page with the guide on checking headphone volume in dB.
Neighbor or apartment noise
A phone meter can help you describe a pattern, but it cannot prove a legal violation by itself. Use it to decide whether the problem is worth documenting more carefully. Start with how to measure neighbor noise.
Sources: CDC / NIOSH noise guidance, OSHA occupational noise, and WHO hearing loss fact sheet.
Honest Decibel is a private iPhone sound level meter. The microphone stays off until you tap Start, readings are calculated on device, and there is no account, tracking, or subscription.