Paragraph 2 I1I2

If the work is such that the daily exposure consists of two or more periods with different sound levels, the daily personal noise exposure level (L_EP,d ) for the combination of periods is ascertained using the formula:

$${\displaystyle \colorbox[rgb]{}{$L_{EP,d}=10{log}_{10}[\genfrac{}{}{0.1ex}{}{1}{T_0}\sum _{i=1}^{i=n}(T_i{10}^{0.1{(L_{Aeq,T})}_i})]$}}$$

where—

• n is the number of individual periods in the working day;

• T_i is the duration of period i

• (L_Aeq,T)_i is the equivalent continuous A-weighted sound pressure level that represents the sound the person is exposed to during period i; and

• $$\sum _{i=l}^{i=n}{T}_i$$

  is equal to T_e , the duration of the person’s working day, in seconds.