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Noise assessments

Protecting hearing and health

Excessive noise in the workplace is a leading cause of permanent hearing loss and can contribute to stress, reduced productivity and increased risk of accidents. Often, hearing damage occurs so gradually that by the time workers notice, it may be too late to prevent it. New Zealand has strict workplace noise exposure limits, legally requiring employers to assess and control noise risks to protect workers and ensure that noise exposure does not exceed an 8-hour average of 85 dB(A) or a peak of 140 dB(C). Impact noise above 140 dB can cause immediate hearing loss. If there is uncertainty about exposure, noise monitoring must be carried out.

An industrial hygienist conducting noise level measurements in a manufacturing plant, with sound meters and production machinery visible, Noise level measurement scene

The importance of noise assessments

Conducting a noise assessment is essential for protecting worker health, ensuring legal compliance and managing workplace risks. Identifying and controlling noise hazards helps prevent hearing loss claims, reduces absenteeism and supports a safer, more productive workplace.

Noise monitoring typically begins with a preliminary assessment to identify potential noise hazards, followed by detailed exposure surveys and personal noise dosimetry using specialised equipment. The frequency of monitoring should be based on risk, with high-risk occupations requiring more frequent assessments. Detailed surveys help pinpoint sources of noise, evaluate the effectiveness of controls and guide improvements.

You should conduct a noise assessment:
  • When workers are exposed to loud machinery, tools or processes
  • During or after changes to plant, equipment or work practices
  • In response to worker complaints or health concerns
  • As part of routine occupational hygiene or risk management programs.

We can help you identify, assess and control noise risks in your workplace.

 
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