Respirable Crystalline Silica FAQ
Q1: What is respirable crystalline silica (RCS)?
RCS is the fine fraction of silica dust created when materials like concrete, stone and brick are cut, drilled or ground. The particles are small enough to be inhaled deep into the lungs and can cause silicosis, lung cancer and other serious lung disease.
Q2: What is the UK Workplace Exposure Limit for silica dust?
The Workplace Exposure Limit (WEL) for respirable crystalline silica is 0.1 mg/m³, averaged over an 8-hour working day (8-hour TWA). Employers must reduce exposure below this and as low as reasonably practicable.
Q3: Who should have silica dust monitoring carried out?
Any organisation whose workers cut, grind, drill or otherwise disturb concrete, masonry, tiles, bricks, stone or silica-containing products — particularly in construction, demolition, stone fabrication, quarrying and precast operations.
Q4: How is silica dust exposure measured?
We use personal air sampling pumps with respirable dust sampling heads worn in the breathing zone. Samples are collected over a period (task or shift), analysed by an accredited lab and compared to the WEL and ALARP guidance.
Q5: How often should RCS monitoring be repeated?
Frequency depends on your risk profile, how close exposures are to the WEL, and whether processes or controls change. Many sites monitor every 1 year or sooner after major changes, new methods or HSE feedback.