Equivalent level, sound exposure, and peak level
Prevention of occupational risks related to noise

The risk associated with occupational noise depends on its level, duration, and frequency distribution. These parameters must therefore be taken into account to characterize the noise. This is achieved by averaging the measured signal over a given time period and weighting it in the frequency domain to bring it in line with the ear’s sensitivity. Regulations rely on two indicators to assess the risk of hearing loss: the daily noise exposure level and the C-weighted peak level.

In addition, information must be provided regarding noisy machinery: the instruction manual must specify the A-weighted sound pressure level measured at workstations and, when this level is excessive, the A-weighted sound power level emitted by the machine.

Finally, when noisy machinery is installed in a space, the premises must be treated so that reverberation does...