SERNEM · HSE
Noise Exposure
NIOSH 85 dBA / 8 hours and 3 dB exchange rate.
Use a decimal point or comma; no thousands separators.
Calculation inputs
Result
Complete all fields with valid finite values and the specified units; denominators/durations must be positive. Cases/workers must be whole numbers.
Review the methodology and limits below before interpreting this result.
Example: 85 dBA × 480 min → 100% dose, 85 dBA. Invalid: zero total duration → no result.
Methodology & limits
T(L) = 480 × 2^((85 − L)/3) min; D = 100 Σ(C/T); L8 = 85 + 10 log10(D/100)
NIOSH recommendation: 85 dBA, 8 hours, 3 dB exchange; not a local legal limit. Continuous noise range 0–115 dBA, total >0–1440 minutes; no lower-threshold cutoff. Unrecorded time assumes zero energy; 0 dBA is not absolute silence. 100+ dBA needs prompt controls; >115 dBA/impulse noise needs specialist measurement. Rounded 3 dB exchange causes small logarithmic-level differences. Dose <100% is not a declaration of safety.
Calculated at full precision; display rounded to two decimal places only.
Official reference / methodologyhttps://www.cdc.gov/niosh/docs/98-126/pdfs/criteriadoc_98-126.pdf