The short answer
Crystalline silica is a mineral in sand, stone, and concrete. Breathing its fine dust — created by cutting or grinding these materials — can cause lung cancer and silicosis. Wet methods, ventilation, and respirators control the dust.
Crystalline silica is classified as a known human carcinogen (IARC Group 1).
People are mainly exposed by breathing fine dust released by cutting or grinding stone, concrete, and similar materials.
It is most strongly linked to lung cancer.
A carcinogen classification describes hazard — whether something can cause cancer — not your personal risk at a given exposure.
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The whole article, with every detail and caution.
Anyone who cuts stone, concrete, or tile at work will find this page useful. It describes silica dust, the lung cancer and lung disease it causes, and how dust control lowers exposure.
The simple version
Silica is a very common mineral. It is found in sand, quartz, stone, and concrete. Cutting, grinding, or drilling those materials releases a fine dust. Breathing that dust over time can scar the lungs and cause lung cancer. Controlling the dust is the key.
What crystalline silica is
Crystalline silica is a natural mineral, and it makes up much of the earth's crust. The hazard is the very fine dust released when workers cut, grind, drill, or crush materials that contain it. That dust is called 'respirable' because the particles are small enough to reach deep into the lungs. Concrete, brick, tile, and engineered stone all contain silica.
How people are exposed
People breathe in silica dust in settings like these:
- Cutting, grinding, or drilling concrete, stone, brick, or tile.
- Working with engineered quartz countertops, sandblasting, or mining.
- Construction, masonry, foundry work, and quarrying.
- Breathing dust that hangs in the air in a poorly ventilated space.
The cancer connection
Respirable crystalline silica causes lung cancer. It also causes silicosis, a serious scarring lung disease, and it raises the risk of other lung problems. Smoking pushes the lung cancer risk higher still.
The World Health Organization has a cancer agency, the International Agency for Research on Cancer (IARC). It places crystalline silica in Group 1, carcinogenic to humans. Group 1 sits at the top of IARC's scale. It means the evidence shows the dust can cause cancer in humans. A US agency, the National Toxicology Program, says the same thing. Its Report on Carcinogens names crystalline silica as known to be a human carcinogen.
Hazard is not the same as risk
The Group 1 listing is about the dust, not about you. It says respirable silica can cause cancer. Your own risk is a separate question, and it turns on how much dust you breathe and over how many years. A stonemason cutting quartz countertops all day is not in the same position as someone who once drilled a hole in a patio slab. Same mineral, same hazard, very different risk.
How to lower your exposure
- Use wet-cutting methods and tools with dust collection, so the dust never gets airborne.
- Keep the air moving, and wear a properly fitted respirator when you need one.
- Follow the OSHA exposure limits for silica.
- Do not smoke.
Dust control is the whole game here. For where a single exposure sits in the bigger picture, see our overview of cancer prevention and what raises cancer risk.
The bottom line
Crystalline silica is a known human carcinogen (IARC Group 1). The risk lives in the dust, not in stone sitting still. If your work makes silica dust, the controls that keep it out of the air matter more than anything else you can do.
Sources
- National Cancer Institute, Crystalline Silica: https://www.cancer.gov/about-cancer/causes-prevention/risk/substances/crystalline-silica
Common questions
Does crystalline silica cause cancer?
Yes. Crystalline silica is classified as a known human carcinogen, which means there is strong evidence it can cause cancer in people. How much any one person's risk rises depends on how much they are exposed to and for how long.
How are people exposed to crystalline silica?
Mostly on the job. Workers breathe in fine dust when they cut, grind, drill, or crush stone, concrete, brick, tile, or engineered stone.
Which cancers are linked to crystalline silica?
Lung cancer is the main one. The dust also causes silicosis, a scarring lung disease, and smoking raises the lung cancer risk further.
How can I reduce my exposure to crystalline silica?
Keep the dust out of the air. Wet-cutting tools, dust collection, good ventilation, and a properly fitted respirator all help, along with following OSHA exposure limits.
Does a carcinogen label mean I will get cancer?
No. A classification is about hazard — whether crystalline silica can cause cancer under some conditions — not a prediction that any one exposed person will develop cancer. Your actual risk depends on the amount and length of exposure and other factors.
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Last updated: 2026-08-10Next planned review: 2028-07-05
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes, and this is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and then compared with the sources listed on it, looking for statements those sources do not back up. That check is not a sentence-by-sentence record and can miss errors. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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