Calculating noise doses and limits
Here, L1, L2 are the various levels to which the employee is exposed during
different periods; t1, t2 are the corresponding exposure times.
The number 8 in the denominator represents an assumed working day of 8 h.
This standard working day is used irrespective of how many hours the employee
actually works. It assumes that all time periods are measured in hours. If for some
reason it is decided to measure all times in minutes, then the 8 must be replaced by
480, the number of minutes in 8 h.