Geological factors result in varying radon levels across Canada. C-NRPP maintains a database of radon tests from different locations, organized by the first three characters of postal codes, although it does not cover all tests conducted.

Indoor radon levels can vary widely, even in the same neighbourhood. This is why it is advisable for you to test your home for radon, even in areas with a lower risk.

The interactive map below shows summarized data on indoor radon levels in the selected area. Click on a shape to view the number of tests, as well as the number and percentage of tests exceeding 200 Bq/m3.