Silica dust is a common hazard on construction, demolition, and earthworks sites. When inhaled, fine crystalline silica particles can cause serious lung diseases, including silicosis, chronic bronchitis, and even lung cancer. Unlike visible dust, silica can remain airborne for hours, making exposure easy if controls are inadequate.
Health Risks
Workers exposed to respirable crystalline silica (RCS) over time can suffer permanent lung damage. Symptoms may develop slowly, and once disease occurs, it is irreversible. Minimising exposure is essential to protect health.
Monitoring
Occupational hygienists assess exposure using:
- Air monitoring (personal and static)
- Dust sampling and analysis
- Real-time dust monitoring for high-risk activities
Monitoring ensures exposure levels stay within the Workplace Exposure Standard (WES) of 0.05 mg/m³ in NSW. Accurate measurement also helps verify the effectiveness of dust control measures like wet methods, ventilation, or PPE.
NSW Compliance
Silica dust is regulated under Work Health and Safety (WHS) laws. Employers must:
- Identify high-risk silica work
- Implement a control plan (Silica Risk Control Plan or SWMS)
- Monitor exposure
- Maintain records and provide worker training
Failing to comply can result in regulatory enforcement, fines, and serious worker harm.
Key Takeaway
Silica dust is invisible but highly dangerous. Early engagement with an occupational hygienist ensures health risks are assessed, monitored, and controlled, keeping workers safe and projects compliant.