Radon testing guides

Le radon est un gaz radioactif qui se forme dans le sol quand l’uranium se dégrade. Il entre par les fissures de la fondation et les joints des tuyaux. L’isolation et une maison étanche le retiennent à l’intérieur. Des années d’exposition causent le cancer du poumon, et ce gaz reste méconnu. Utilisez la recherche pour les mots que les gens cherchent : gaz radioactif, uranium, fondation, maison étanche, cancer du poumon, becquerels.

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

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

25 oct. 2026

Radon and children: test the bedroom and the playroom

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

25 oct. 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.

25 oct. 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.

25 oct. 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.

25 oct. 2026

After radon mitigation: the retest that checks the fan

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

25 oct. 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.

25 oct. 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.

25 oct. 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.

25 oct. 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.

25 oct. 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.

25 oct. 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.

25 oct. 2026

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