| Description | Equation |
| Compute the noise dose based on several time periods of constant noise during the shift | The total noise dose over the
work day, as a percentage, is
given by the following equation
where Cn indicates the total time
of exposure at a specific noise
level, and Tn indicates the
reference duration for that level. D = 100*((C1/T1) + (C2/T2) +(C3/T3) + ... + (Cn/Tn)) |
| The reference duration is equal to the time of exposure to continuous noise at a specific sound level that will result in a one hundred percent dose | The reference duration, T, for
sound level, L, is given in hours
by the equation: T = 8/(2^((L - 90)/5)) |
| Given a noise dose as a percentage, compute the equivalent eight-hour time weighted average noise level | The equivalent eight-hour time
weighted average, TWA8, is
computed from the dose, D, by
the equation: TWA8 = 16.61* Log10(D/100) + 90 |