Workplace Noise Rules
NIOSH recommends keeping exposure under 85 dBA over an 8-hour day. In the US, OSHA requires a hearing conservation program at 85 dBA averaged over 8 hours. In the UK and EU, action is required from 80 dB.
| Rule | Level | What It Means |
|---|---|---|
| NIOSH recommended limit | 85 dBA, 8 hours | Half the time for every 3 dB more |
| OSHA action level | 85 dBA, 8 hours | Hearing conservation program required |
| OSHA permissible limit | 90 dBA, 8 hours | Half the time for every 5 dB more |
| UK and EU action values | 80 and 85 dBA, daily | Information, then hearing protection |
How to Check a Workplace
- Measure where people work, with the phone at ear height and the microphone uncovered.
- Let it run through each noisy task for a minute or two and note Avg, the average level.
- A quick rule: if you have to shout to be heard by someone an arm’s length away, the level is probably above 85 dBA.
This meter is a quick check, not a compliance instrument. Use a certified meter or dosimeter for formal assessments. Our sound level meter guide covers Class 2 meters, and the sound level meter comparison lists more models side by side. For what Type 1, Type 2, and dosimeters each measure, see the types of sound level meters.