Worksafe regulations revolve around 3 main issues.
1. Identifying hazardous noise in the workplace.
2. Control hazardous noise, or protect staff from hazardous noise if control is not possible.
3. Monitor the hearing of staff that work in hazardous noise, and notify Worksafe if Serious Harm occurs.
Whether or not a person is wearing appropriate hearing protection, the following values of noise exposure are considered to be the limit for an acceptable risk to their hearing in a 24-hour period, any more and their hearing should be monitored.
Noise Threshold Requiring Hearing Monitoring
It is recommended that testing be done at the commencement of employment, 3 months later, then every 12 months.