Radon risk varies significantly across Canada. Alberta and Saskatchewan consistently rank among the highest. Coastal provinces tend to be lower on average, but every home is different.
Health Canada recommends that all Canadians test their homes, regardless of province. A long-term test kit (90+ days) gives the most accurate picture.
Average Radon Levels by Province
Based on Health Canada survey data. The national action level is 200 Bq/m³.
Alberta
~168 Bq/m³ · Higher RiskAlberta has one of the highest radon concentrations in Canada, with significant areas exceeding the 200 Bq/m³ action level — particularly in Calgary and surrounding regions.
Saskatchewan
~152 Bq/m³ · Higher RiskSaskatchewan has among the highest radon levels in Canada. A significant proportion of homes exceed the 200 Bq/m³ action level.
Manitoba
~94 Bq/m³ · Higher RiskManitoba has some of the highest radon levels in Canada. Winnipeg and southern regions have recorded elevated readings in many homes.
Yukon
~91 Bq/m³ · Moderate RiskLimited testing data. The geology in parts of Yukon can produce elevated radon. Testing is recommended.
Quebec
~89 Bq/m³ · Moderate RiskQuebec's radon levels are moderate on average. Areas near the Laurentian Mountains and Canadian Shield geology can see higher readings.
Northwest Territories
~85 Bq/m³ · Moderate RiskLimited data available. Testing recommended for all homes given geological variability.
Ontario
~84 Bq/m³ · Moderate RiskOntario's radon levels vary by region. Northern Ontario and areas near the Canadian Shield tend to have higher levels. Southern Ontario varies widely by neighbourhood.
Newfoundland and Labrador
~78 Bq/m³ · Moderate RiskRadon levels in Newfoundland can be elevated, particularly in areas with granite-rich geology.
British Columbia
~75 Bq/m³ · Moderate RiskRadon levels vary significantly across BC. Interior regions and some parts of the Lower Mainland have elevated levels. Coastal areas tend to be lower.
Nova Scotia
~72 Bq/m³ · Higher RiskNova Scotia has elevated radon levels, tied to granite geology across much of the province. Testing is recommended for every home.
New Brunswick
~66 Bq/m³ · Higher RiskRadon levels in New Brunswick are elevated in much of the province, with variability depending on soil and geology.
Prince Edward Island
~47 Bq/m³ · Moderate RiskPEI has generally lower radon levels than the other Atlantic provinces, though testing is still recommended.
Nunavut
~40 Bq/m³ · Lower RiskLimited testing data. Most structures are newer and well-ventilated, which helps reduce radon accumulation.