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Key Messages
- Radon is an invisible, odourless radioactive gas that forms naturally in soil and rock and can accumulate indoors.
- People who smoke face a sharply increased lung cancer risk when exposed to elevated levels of radon, rising to 1-in-3 compared with 1-in-20 in people who choose not to smoke (Health Canada, 2025).
- Introducing radon testing as an important preventive action for patients who smoke can help lower their lung cancer risk. People who choose not to smoke too can benefit from knowing their home’s radon levels.
- Elevated radon levels occur in Ottawa, across Ontario, and throughout Canada; no home is radon free, and testing is the only way to know a home’s level.
| Canadian Guidelines |
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According to Health Canada’ s 2025 guideline for radon levels, the Canadian indoor radon guideline is 200 Bq/m3 and corrective action to lower the level within 1 year is recommended when a long-term test result indicates a radon level above 200 Bq/m3. |
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Radon in the home
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