3.3.4.5 Probabilities of a person standing in a dangerous location

The probability of a person being in a dangerous location (Equation 3.3.4.5.1) depends on the how long they are there:

[equation](3.3.4.5.1)

Here, t_z is the duration of stay in hours per year at the hazardous location. If t_z is not known, P_p = 1 should be set.