This plain-language guide covers OSHA 29 CFR 1910.95 1910.95(b) — Permissible Noise Exposures — explaining exactly what the section requires, what it means in practice for EHS managers, and the most common compliance gaps. According to CDC/NIOSH, approximately 22 million U.S. workers are exposed to hazardous occupational noise annually. See the complete OSHA 1910.95 guide for the full standard overview.
Soundtrace delivers audiometric testing and noise monitoring that meets every 1910.95 requirement — including permissible noise exposures — supervised by a licensed audiologist.
What 1910.95(b) Actually Says
OSHA 29 CFR 1910.95(b)(1) states: "When employees are subjected to sound exceeding those listed in Table G-16, feasible administrative or engineering controls shall be utilized. If such controls fail to reduce sound levels within the levels of Table G-16, personal protective equipment shall be provided and used to reduce sound levels within the levels of the table."
1910.95(b)(2) adds: "If the variations in noise level involve maxima at intervals of 1 second or less, it is to be considered continuous."
Table G-16: OSHA's Permissible Noise Exposures
| Duration Per Day (Hours) | Sound Level (dBA Slow Response) |
|---|---|
| 8 | 90 |
| 6 | 92 |
| 4 | 95 |
| 3 | 97 |
| 2 | 100 |
| 1.5 | 102 |
| 1 | 105 |
| 0.5 | 110 |
| 0.25 or less | 115 |
The Table G-16 values represent OSHA's 5 dB exchange rate: each 5 dB increase in noise level halves the permissible exposure time. A worker can be at 90 dBA for 8 hours, but only at 95 dBA for 4 hours, 100 dBA for 2 hours, or 115 dBA for 15 minutes maximum.
The 90 dBA PEL vs. the 85 dBA Action Level
1910.95(b) establishes the PEL at 90 dBA for 8 hours. But the hearing conservation program (HCP) begins at the action level of 85 dBA TWA — 5 dB lower, defined in 1910.95(a)(1) and the definitions at Appendix I.
| Threshold | Level | What It Triggers |
|---|---|---|
| Action Level | 85 dBA TWA / 50% dose | Full 6-element HCP: monitoring, audiometry, HPD, training, records, access |
| PEL (Table G-16) | 90 dBA TWA / 100% dose | All HCP elements PLUS documented engineering controls assessment; HPD becomes mandatory (not just made available) |
| Ceiling | 115 dBA instantaneous | Cannot be exceeded without hearing protection, regardless of duration |
| Peak impact/impulse | 140 dB peak | OSHA limit for instantaneous peak; impulse noise standard |
The Engineering Controls Requirement Above the PEL
1910.95(b)(1) is explicit: when exposures exceed Table G-16 values, feasible engineering or administrative controls must be used. HPD alone is not sufficient above the PEL — you must document that engineering controls were evaluated and implemented where feasible. If controls reduce exposure to within Table G-16, HPD is still required as a backup. If controls cannot reduce exposure to within Table G-16, HPD must be used to do so.
Many employers treat the PEL as the compliance target. It is not. The HCP — with audiometry, HPD, training, and records — begins at 85 dBA. Workers at 88 dBA TWA are below the PEL but still require full HCP enrollment, audiometric testing, and HPD availability. The PEL governs engineering controls; the action level governs the HCP.
The 5 dB Exchange Rate vs. NIOSH's 3 dB Exchange Rate
OSHA uses a 5 dB exchange rate (Table G-16). NIOSH recommends a 3 dB exchange rate based on equal-energy principles. This means NIOSH considers 88 dBA for 8 hours equivalent to 91 dBA for 4 hours (doubling time = 3 dB), while OSHA considers 90 dBA for 8 hours equivalent to 95 dBA for 4 hours (doubling time = 5 dB).
The practical implication: NIOSH's limit is more protective. A worker whose OSHA dose is 80% (below the PEL) may have a NIOSH dose above 100%. Many industrial hygienists run NIOSH-based calculations alongside OSHA calculations for comprehensive exposure assessment. See: OSHA vs. NIOSH noise criteria: exchange rate comparison.
OSHA 1910.95 compliant — every section covered
Soundtrace automates 1910.95 compliance across monitoring, audiometry, HPD, training, and records — with licensed audiologist supervision of the complete program.
Get a Free Quote Book a demo →