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Requirements for hygiene monitoring

Hygiene monitoring includes toxic substance monitoring and noise monitoring, and must be done by a competent person.

What is hygiene monitoring

Hygiene monitoring tests the workplace environment, and includes toxic substance monitoring and noise monitoring. Monitoring must be done by a competent person.

A competent person needs to complete the relevant WSQ certification, including the following:

  • For noise monitoring, they should complete the Monitoring Noise and Vibration course.
  • For toxic substance monitoring, they should complete the Measure Exposure and Assess the Risk due to Hazardous Substances course.

Relevant regulations:

What is monitoring

Monitoring helps you assess your workers’ level of exposure to hazards and how effective your hazard control measures are.

You should evaluate the results of workplace monitoring and take the necessary measures to safeguard your workers’ health. You should also inform employees of the results and keep a record.

Toxic substances monitoring

If your workplace uses or generates toxic substances, you must conduct regular toxic substances monitoring and it must be done by a competent person. The frequency of monitoring is dependent on the level of contaminant compared against the Permissible Exposure Limit (PEL) stated in the WSH (General Provision Regulations) First Schedule.

The recommended frequencies for monitoring are:

Ratio (%) of concentration of contaminants compared to PEL Frequency of monitoring
< 10% PEL No monitoring is required. A re-assessment should be carried out if there is any change in the process.
10% to 50% PEL At least once a year.
> 50% to 100% PEL At least once every 6 months.
> 100% PEL At least once every 3 months, until the exposure is reduced to below the PEL by appropriate control measures.

For details on monitoring requirements, refer to guidelines on sampling strategy and submission of toxic substances monitoring.

Submit a toxic substances monitoring report.

Noise monitoring

If more than 10 people are likely to be exposed to excessive noise at your workplace, you must conduct noise monitoring at least once every 3 years. Noise monitoring must be done by a competent person.

Noise monitoring involves:

  • Workplace noise monitoring – testing noise levels throughout the workplace.
  • Personal noise monitoring – testing noise levels that specific groups of workers are exposed to.

For details on monitoring requirements, refer to the Workplace Safety and Health Guidelines.

Submit a noise monitoring report.