Radon exposure is the leading cause of lung cancer in non-smokers. Explore average residential radon concentrations by province, health region, and postal area. Health Canada's Indoor Action Level is 200 Bq/m³.
Enter the first 3 characters of your postal code (Forward Sortation Area) to see local radon statistics.
Tip: a Canadian postal code looks like A1A 1A1. Only the first 3 characters identify your area.
Type the first 3 characters of your postal code (FSA) to look up radon data for your area.
See average radon levels and the percentage of homes above Health Canada's 200 Bq/m³ guideline.
What it is, why it matters, and how to test and reduce radon in your home.
Radon is a naturally occurring radioactive gas produced when uranium in soil and rock breaks down. It is invisible, odourless, and tasteless, and can accumulate to harmful levels inside homes — especially in basements and lower floors.
A 91-day (3-month) test captures seasonal swings in radon levels — outdoor temperature, barometric pressure, and soil moisture all affect how much radon enters your home. Shorter tests are less reliable because they may miss high-season spikes or low-season dips.
Radon levels change constantly with weather, ventilation, and daily habits. An Ecosense digital monitor captures these real-time shifts day and night.
Explore Ecosense →Health Canada's 200 Bq/m³ guideline, WHO's 100 Bq/m³ reference, pCi/L conversions, and how to read your result.
Read more →Why radon has no acute symptoms — and how long-term exposure causes lung cancer in non-smokers.
Read more →Long-term kits vs. real-time monitors, where to place them, and how long to measure.
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