Silica dust can be invisible, but air monitoring provides objective data on exposure. Understanding when results indicate a high-risk situation is crucial for worker safety and compliance under NSW WHS laws.
What Air Monitoring Shows
Air monitoring measures respirable crystalline silica (RCS) in mg/m³. Results reflect:
- The effectiveness of dust control measures
- Workers’ actual exposure levels
- Whether work practices are safe or need adjustment
Monitoring can be personal (worn by workers) or static (fixed location), depending on the activity.
When Results Indicate High Risk
High-risk action is generally required if monitoring shows exposure at or above the Workplace Exposure Standard (0.05 mg/m³) over an 8-hour shift. This may trigger:
- Immediate review of work methods
- Additional engineering controls, such as wet cutting or local exhaust ventilation
- Provision of higher-grade PPE or respirators
- Increased monitoring frequency
Even results below the WES can warrant caution if exposure patterns are intermittent or if vulnerable workers are present.
Why Timely Action Matters
Ignoring high readings can lead to:
- Long-term health impacts for workers (silicosis, chronic lung disease)
- Regulatory enforcement or stop-work notices
- Increased liability and project delays
Key Takeaway
Air monitoring is not just a compliance formality—it is a critical tool for managing silica risk. Engaging an occupational hygienist ensures results are accurately interpreted, controls are effective, and workers remain safe.