How Often Should Air Monitoring Be Conducted on Construction Sites?
Air monitoring is essential for managing silica dust exposure, but knowing how often to test is key to protecting workers and maintaining compliance.
Factors Influencing Monitoring Frequency
- Type of Work – High-risk activities like cutting, grinding, or demolition of silica-containing materials require more frequent monitoring.
- Duration and Intensity – Longer shifts or continuous dust-generating tasks increase the need for repeated testing.
- Control Measures in Place – Sites with robust engineering controls may require less frequent monitoring than those relying mainly on PPE.
- Regulatory Requirements – NSW WHS codes recommend monitoring whenever there is potential exposure to respirable crystalline silica.
Recommended Approach
- Initial baseline monitoring to determine exposure levels
- Regular monitoring during ongoing high-risk activities
- Follow-up monitoring if work practices, materials, or controls change
Why It Matters
Monitoring ensures that exposure stays below the Workplace Exposure Standard (0.05 mg/m³). It also provides evidence of compliance, validates control measures, and identifies if additional protections are needed.
Key Takeaway
There is no “one-size-fits-all” frequency for silica air monitoring. An occupational hygienist can design a monitoring plan tailored to your site, protecting workers and ensuring compliance under NSW WHS laws.