Compliance · US MSHA
MSHA Occupational Noise Exposure (30 CFR Part 62)
Occupational: mines (USA), hearing conservation
The US Mine Safety and Health Administration's noise standard, 30 CFR Part 62, protects miners' hearing. It sets a permissible exposure level of 90 dBA as an 8-hour time-weighted average (a dose of 100 %), an action level of 85 dBA (a dose of 50 %) that requires enrollment in a hearing conservation program, and a ceiling: no miner may be exposed at any time to sound levels above 115 dBA. Doses use a 5 dB exchange rate.
Limit values
MSHA noise Limit Values
Every value US MSHA publishes for the 2 parameters below, with its averaging period, as the standard states it.
Who it applies to
Who Must Comply
Operators of US coal and metal and nonmetal mines, for every miner exposed to noise on a work shift.
Monitoring
How Monitoring Demonstrates Compliance
Exposure is determined with a dosimeter or sound level meter integrating the levels the standard specifies over the shift. Above the permissible exposure level the operator must use feasible engineering and administrative controls; continuous noise monitoring at fixed points shows where and when levels rise, which is where those controls go.
Recommended
best match-
Thiamis connects 1 instrument
A gateway that connects the third-party instruments you choose to the Aethair Platform.
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Max Level (Lmax)TWA / Noise DoseTSI Quest SoundPro SE/DL Class 1 and Class 2 integrating sound level meters and real-time analyzers measure broadband…
Also measures 5 more
Average Level (Lavg)Equivalent Continuous Level (Leq)Min Level (Lmin)Peak Level (Lpeak)Sound Pressure Level (SPL) -
Who measures each parameter
| Parameter |  Aethair PRO |  Aethair IAQ | External |
|---|---|---|---|
| TWA / Noise Dose | — | — | 1 instrument via Thiamis |
| Max Level (Lmax) | — | — | 1 instrument via Thiamis |
Devices
Devices That Cover MSHA noise
How much of this standard one Aethair monitor covers, followed by the third-party instruments in the sensor catalog that measure its parameters. Each connects to Environet through a Thiamis gateway, which adds whatever the monitor leaves out.
Covers both on its own
Solutions
Solutions Judged Against MSHA noise
Cabin Air Quality
Respirable dust, gases, and blast monitoring
Questions
MSHA noise FAQ
What is the MSHA noise limit?
A permissible exposure level of 90 dBA as an 8-hour time-weighted average, with an action level of 85 dBA and no exposure at any time above 115 dBA.
How does MSHA's noise standard differ from OSHA's?
Both use a 90 dBA permissible level, an 85 dBA action level, and a 5 dB exchange rate; MSHA's applies to mines, OSHA's (29 CFR 1910.95) to general industry.
What happens at the MSHA action level?
A miner whose exposure reaches the 85 dBA action level must be enrolled in a hearing conservation program.
Monitor Against MSHA noise
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