Silica dust: what you can't see can hurt you

Where respirable crystalline silica comes from, and why wet methods and dust control come first.

Cutting, grinding, drilling or crushing concrete, brick, stone and some other materials can release very fine dust that goes deep into the lungs. Long-term exposure can cause serious lung disease, including silicosis and lung cancer.

Key points

  • Employers must assess the risk and have an exposure control plan where workers may be exposed to respirable crystalline silica.
  • Controls come first at the source: wet cutting, tools with dust capture, enclosures and ventilation. A respirator is the last line, not the first.
  • Workers must be instructed and trained in the hazards and in the controls for their task.
  • Do not dry-sweep or use compressed air to clean off dust. Use wet methods or a suitable HEPA vacuum.
  • Keep dusty work clothes out of your vehicle and home where practicable, and wash up before eating or drinking.
  • If you wear a respirator, it must be the right type, fit-tested and used correctly.

Ask the crew

  • Which tasks today make dust, and how are we controlling it at the source?
  • Is the water supply or dust capture working on each tool?
  • Who is fit-tested for the respirators on this job?

Sign-off sheet

The PDF includes a sign-off sheet with date, location, presenter and nine signature lines. Print it, run the talk and keep the signed copy with your site safety records.

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Free to print and share

This resource is free to print, copy and share with attribution to Gama Safety Canada. Please keep the Gama Safety footer on printed copies, and link to this page if you share it online. Please do not sell it, and check any regulatory citation against the source before changing it.

Link to this page (copy and paste)

Sources

Regulation references were checked against the online OHS Regulation in October 2026. Regulations change: confirm against the current text and your employer procedures. General information, not legal advice.

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