Enter your Canadian postal code to see local radon exposure based on 11,168 long-term Health Canada measurements. 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.
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.
Radon is the leading cause of lung cancer in non-smokers and the second leading cause overall. Long-term exposure to elevated indoor radon significantly increases lung-cancer risk over a lifetime.
Monitor your home for ≥91 days on the lowest lived-in level of your home. Health Canada recommends every Canadian home be tested, regardless of regional averages — neighboring homes can have very different levels.
Health Canada recommends taking action when long-term average indoor radon exceeds 200 Bq/m³. If your result is between 200 and 600 Bq/m³, plan remediation within two years. If it is above 600 Bq/m³, take action within one year. A certified radon professional can install a mitigation system (typically a fan and venting pipe) to reduce levels.
Radon levels change constantly based on the weather, ventilation, and daily habits. A high-sensitivity Ecosense digital monitor captures these real-time shifts instantly, showing you exactly how your indoor air behaves day and night. Instead of waiting months for lab results, you get continuous, precise peace of mind right on your smartphone.
Explore Ecosense Home Solutions →A 91-day (3-month) test captures seasonal swings in radon levels — 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. If you start late or stop early, contact your test provider: some labs can still analyze slightly shorter durations, but you may need to restart with a new detector to get a valid long-term average. Do not move the detector once placement has begun.
Dig into symptoms, testing, safe levels, and mitigation in Canada.
Why radon has no acute symptoms — and how long-term exposure causes lung cancer.
Long-term kits vs. real-time monitors, placement, and timing.
Health Canada 200 Bq/m³, WHO 100 Bq/m³, and pCi/L conversions.
Sub-slab depressurisation, typical $2,000–$3,500 cost, C-NRPP contractors.
See provincial averages, health-region hotspots, and the postal areas with the highest measured radon.
Open the Canadian Radon Map →