The "famous" 2003/10/CE.

Concern for the relevant social impact of Hearing Disabilities caused the European Council to issue Directive 2003/10/EC with more stringent exposure limit values.
Now, where daily noise exposures are expected to reach or exceed 80dB(A), employers and employees must assess the relevant risks. At the 8-hour daily upper exposure value of 85dB(A) noise-control measures must be adopted.
In the interests of improving worker health and safety, the Directive specifically invites employers to keep up with technical progress and scientific knowledge regarding the risks of exposure to noise.