In Australia, the law says that your employer (your boss) must do all they can to make sure your job does not hurt you or make you sick. This law is called work health and safety (WHS) or occupational health and safety (OHS).
The model WHS Regulations, define the exposure standard for long term exposure to noise as the amount of sound energy, that is equivalent to a steady noise level of 85 decibels over an 8 hour shift. Whether this is exceeded depends on the level of noise involved and how long workers are exposed to it.
Everyone has a right to be safe at work, including volunteers. Volunteers play a vital role in communities across Australia and make significant contributions by carrying out unpaid work for a variety of organisations every day.