Noise - Maximum Daily Dose Level
Calculate daily noise exposure dose and convert to 8-hr Time-Weighted Average (TWA). When exposed to different noise levels throughout the day, this tool computes the cumulative daily dose as a percentage and the corresponding TWA in dB(A). According to NIOSH guidelines, the daily dose should not exceed 100%.
Noise Dose Calculation
When exposed to different noise levels throughout a working day, the daily dose can be calculated using:
D = (te₁/td₁ + te₂/td₂ + ... + teₙ/tdₙ) × 100%
where:
- D = daily noise exposure (%)
- te = exposure time at a specified noise level (min)
- td = maximum duration time at specified noise level (min)
The Time-Weighted Average (TWA) for an 8-hour shift is then calculated as:
TWA = 10 log(D/100) + 85
According to NIOSH, the daily dose level should not exceed 100%.