Radon testing guides

Radon is a radioactive gas that forms in the soil as uranium breaks down. It seeps in through foundation cracks and gaps around pipes. Insulation and a tight house hold it indoors. Years of exposure cause lung cancer, and the gas is still little known. Use the search below for the words people look up: radioactive gas, uranium, foundation, airtight home, lung cancer, becquerels.

100, 148 or 200 Bq/m³: WHO, the US EPA and Canada

Three policies, one house. Compare the report with 200 first.

Oct 25, 2026

Radon and children: test the bedroom and the playroom

Not a detector in the hallway. The lowest room where someone sleeps.

Oct 25, 2026

Radon and smoking: the risks combine, they do not cancel

Health Canada states the combined risk without a single magic multiplier for every home.

Oct 25, 2026

Radon and lung cancer in Canada: no cough, a long exposure

Class 1 carcinogen. The risk is years in the room where you sleep, not a weekend spike.

Oct 25, 2026

Radon in Canadian schools and daycares: test the rooms children use

Where to put detectors in a school, and why a summer test misses the exposure.

Oct 25, 2026

After radon mitigation: the retest that checks the fan

Manometer, same room, heating season: how to confirm a system that is already installed.

Oct 25, 2026

Radon in a crawl space: test the room above, fix the soil path

Vents closed for winter, a vapour barrier that stops at the wall, and the test that actually matches the guideline.

Oct 25, 2026

Radon in Windsor: Essex tested at 13.8%, well above Toronto

Southwestern Ontario was not the GTA in this survey. Windsor’s sample is one of the larger ones.

Oct 25, 2026

Radon in Gaspé: 25.3% of homes in the Gaspésie health region

The highest Quebec region in the Health Canada survey. Gaspé, Carleton and the Islands still test one house at a time.

Oct 25, 2026

Radon in Montreal: 6.9% of 73 homes, lower than Laval in the same survey

The island tested lower than Laval and much lower than Gaspésie. A basement in Rosemont is still a basement.

Oct 25, 2026

Radon in Charlottetown: the Island’s only line was 3.5%

The lowest province in the survey. Charlottetown does not get a cleaner number than the Island.

Oct 25, 2026

Radon in St. John’s: the eastern region tested at 4.0%, the west of the island at 10.4%

St. John’s sat low in the survey. The west of the same island did not.

Oct 25, 2026

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