Indoor Air Quality

Radon

Indoor radon averages, risk categories, and geology notes for 70 communities. Sourced from Health Canada Cross-Canada Radon Survey data.

Indoor air quality

Radon Levels Across Canada

Mean indoor radon, homes above the Health Canada reference level, and regional geology for every tracked community.

169
Communities tracked
13 provinces
160 Bq/m³
National avg radon
Sample city mean
22%
Homes above 200 Bq/m³
Average across sample cities
58
High / very high risk
59 cities above reference level
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From geology to indoor levels

Understanding Radon Risk By City

Radon is a colourless, odourless gas that varies house to house. Each community page shows mean indoor radon levels, the share of homes above 200 Bq/m³, risk category, and underlying geology — drawn from Health Canada's national survey data.

Browse by region

All Provinces & Territories

Select a province to explore local radon profiles

Featured communities

Highest Mean Radon Levels

Communities with the highest average indoor radon in our sample

Test Your Home

Explore radon levels for Canadian communities — mean concentrations, risk categories, and geology on every city page.

Mitigation guide