OSHA 1910.95 Noise Dose and TWA
Multi-row workshift dose with the OSHA 5 dB exchange formula, 8-hr TWA.
Example
You enter
- Rows level dba 88, hours 8; level dba 95, hours 2
You get
- Total dose (%) 125.7 %
- 8-hr TWA (dBA) 91.65
Details, formula, and sources
Multi-row workshift dose with the OSHA 5 dB exchange formula, 8-hr TWA, and pass / fail against the 85 dBA action level and 90 dBA PEL.
T_hr = 8 / 2^((L - 90) / 5). D_pct = sum(C_i / T_i) * 100. TWA_dBA = 16.61 * log10(D / 100) + 90. Levels below 80 dBA contribute zero to the OSHA dose.
OSHA 29 CFR 1910.95(b) Appendix A and Table G-16a.
ecfr.gov for 1910.95; cdc.gov/niosh for the NIOSH 98-126 alternative.
Math aid for personal verification. Stop work and consult the qualified person on site if any number does not match the field condition.
Field names used by the API: rows, total_dose_pct, twa_dBA
- Exchange rate 5 dB (OSHA)OSHA 1910.95(b) Appendix A
- NIOSH alternative 3 dB exchange rate; not implemented here because OSHA is the regulatory recordNIOSH 98-126
- Action level TWA 85 dBA = 50% doseOSHA 1910.95(c)
- PEL TWA 90 dBA = 100% doseOSHA 1910.95(b)
- Threshold levels below 80 dBA contribute zero doseOSHA 1910.95 Appendix A