Respirable Crystalline Silica vs Nuisance Dust – What’s the Difference?
Not all dust is equally hazardous. On construction sites, it’s important to distinguish between respirable crystalline silica (RCS) and ordinary nuisance dust to manage risks effectively.
Respirable Crystalline Silica (RCS)
- Small particles (<10 microns) that can penetrate deep into the lungs
- Found in concrete, stone, masonry, and engineered stone
- Exposure can cause silicosis, lung cancer, and chronic respiratory disease
- Strictly regulated under NSW WHS laws
Nuisance Dust
- Larger particles that generally settle quickly
- Can cause temporary irritation to the eyes, nose, or throat
- Not associated with long-term lung disease
- Still requires good housekeeping and dust control to prevent slips, falls, and discomfort
Why the Difference Matters
- Controls for nuisance dust (e.g., sweeping or basic PPE) are usually insufficient for RCS.
- Only targeted control measures, monitoring, and compliance strategies can protect workers from silica-related health risks.
Key Takeaway
Understanding the difference between nuisance dust and respirable crystalline silica is critical. If your site generates silica dust, an occupational hygienist can assess exposure, recommend controls, and ensure compliance, keeping workers safe and your project on track.