TWA from Dose

TWA from Dose

NO-03
ASPCSPFoundational

Formula
TWA = 16.61 × log₁₀(D/100) + 90
When to Use

Convert a noise dose percentage into an equivalent 8-hour TWA exposure level in dB.

Symbol Legend
SymbolMeaningUnitNote
TWA8-hour Time-Weighted Average noise level )dB(A
DMeasured noise dose from dosimeter%
16.61Constant based on 5 dB exchange rate
90OSHA reference level )dB(A

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