Canada radon map: what the surveys show for your area
Explore Cross-Canada Radon Survey results by region, province, city and census division, with the source, weighting and sample for every figure.
Tool
Canada radon map: what the surveys show for your area
Share of properties at or above 200 Bq/m³ by survey reporting unit, Canada
- 5% or less
- over 5% to 10%
- over 10% to 20%
- over 20% to 30%
- over 30% to 40%
- over 40%
- No data
- Insufficient data
Each census division shows the figure for its reporting unit, so every division in a pooled unit takes the pooled figure. Divisions the report lists with no data or fewer than four readings are marked.
Source: Cross-Canada Survey of Radon Exposure in the Residential Buildings of Urban and Rural Communities, 2024 Report, Version 1.1 (CCSR.24.1.1), released October 2024, ISSN 2818-8195. Cross-Canada Survey of Radon working group. Boundaries: Statistics Canada, 2021 Census census-division cartographic boundary file, adapted. Not an endorsement by Statistics Canada.
Method
The tool follows the steps on this page, in order. You can follow them with a pen. Work it out by hand
Pick a province, city or census division to see what the 2024 Cross-Canada Radon Survey (Version 1.1) found there. Each figure shows the survey page it came from and its sample. Each average says whether it is weighted, and so does each province share; where the survey does not say, we say so. No figure on this map is your home’s level.
See every figure in one table, with its survey page.
A map shows area averages, not your home; only a test shows your level
Every figure on the map describes a group of homes in an area, not one home. Radon is found in every building in Canada at some level. No average can tell you the level in your home.
The survey says not to use its results to judge your own risk or to decide whether to test. Only a long-term test shows your home’s level.
See how to test your own home.
Every figure links to its survey, its weighting and its sample size
Every figure comes from the 2024 Cross-Canada Radon Survey (Version 1.1). Each figure names its page in the survey and its sample, and says whether it is weighted where the survey says. The sample is a count of long-term readings or, for cities, a band of properties with radon data. Province figures print no sample.
We show the weighting because it can move an average. Weighting raised the Prince George average by 18% and lowered the Kelowna average by 15.4%. Check the weighting before you compare two areas.
See what other radon maps show.
Areas with too few tests are marked as such, never guessed
The survey pooled census divisions that had fewer than 25 readings with their neighbours until each unit had 25. Those units cover 278 of the 293 census divisions.
Nunavut has no indoor test results. Where a shape has no data, the map shows “No data” and does not guess.
See what the figures add up to across Canada.
Province views are simplified; the census divisions carry the detail
The map is drawn from Statistics Canada’s 2021 census division boundaries and shows the whole country at every screen size. At small sizes you may see a simpler province view. It is labelled “Provincial view” and uses provincial data.
The area picker under the map lists every census division, and each province page has its full census division table. Use either to choose your area on any screen.
Find your province’s page and its census division table.
How to work it out by hand
You can check any figure on the map against the levels dataset, one row at a time, with these five steps.
- Open the levels dataset.
- Find the row for your province, city or census division.
- Read the share of tests at or above 200 Bq/m³ and the average.
- Read the row’s weighting status and its sample.
- Test your own home, because no row is your home.