Noise Exposure Limits: NIOSH
Occupational noise exposure limits, action levels, and hearing protector ratings per OSHA 29 CFR 1910.95 (5 dB exchange rate, 90 dBA PEL, 85 dBA action level), NIOSH REL 1998 (3 dB exchange rate, 85 dBA), ACGIH TLV 2024 (3 dB exchange rate, 85 dBA), EU Directive 2003/10/EC (80/85/87 dBA thresholds), and ISO 1999:2013. Includes time-weighted average duration limits at each exposure level, HPD noise reduction ratings (NRR per ANSI S3.19 and SNR per EN ISO 4869-2) for foam plug/earmuff/dual protection, and octave-band A-weighting correction factors (63–8000 Hz) per IEC 61672-1.
| regulatory framework | exposure parameter | action level dBA (dBA) | dose at action level pct (%) | duration hours (hours) | duration minutes (minutes) | exchange rate dB (dB) | level dBA (dBA) | notes | parameter type | peak limit dB (dB) | pel twa dBA (dBA) | standard document |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| NIOSH | 100dBA_0.25hr | 85 | 100 | 0.25 | 15 | 3 | 100 | 3 dB exchange rate: 100=85+15 dBA -> 15 min limit | time_limit | 140 | 85 | NIOSH REL 1998 |
| NIOSH | 103dBA_7.5min | 85 | 100 | 0.125 | 7.5 | 3 | 103 | 3 dB exchange rate: 103=85+18 dBA -> 7.5 min limit | time_limit | 140 | 85 | NIOSH REL 1998 |
| NIOSH | 106dBA_3.75min | 85 | 100 | 0.0625 | 3.75 | 3 | 106 | 3 dB exchange rate: 106=85+21 dBA -> 3.75 min limit | time_limit | 140 | 85 | NIOSH REL 1998 |
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