In circumstances duly justified to the Labour Inspectorate monitoring officer and for activities characterised by a significant variation in daily noise exposure from one working day to the next, the weekly noise exposure level may be used instead of the daily exposure level to assess the noise levels to which workers are exposed, for the purposes of applying the exposure limit values and the values triggering preventive action.
This substitution may only be made on condition that the weekly noise exposure level indicated by an appropriate control does not exceed the exposure limit value of 87 dB(A) and that appropriate measures are taken to minimise the risks associated with these activities.