How does radon get into my indoor spaces?
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What is radon gas and where does it come from?

Radon is a colourless, odourless, radioactive gas and is the #1 environmental cancer-causing agent. The rock conditions in the BC Interior have created soils that emit radon, which comes from the radioactive decay of uranium found in these soils and rocks.

Although radon is natural, the way buildings are constructed can cause radon to become trapped indoors and build in concentration to levels that cause harm.

How does radon gas get into my house?

Radon takes the easiest path into our homes, and this can vary. Radon can enter a home through small and large openings in the foundation and the amount entering can be influenced by the heating and ventilation system. During the cooler months windows and doors are often closed and rising warm air in a home draws more radon from the ground.

How many houses in Canada have radon?

All houses will have some radon. Indoor areas in contact or below the ground are more likely to contain higher levels. Any amount of radon is putting residents at risk.

Do other buildings have radon too?

Yes, all indoor spaces will have some amount of radon. Exposure to radon also occurs at places of work, school and public buildings. Lower levels of buildings in contact or below ground are more likely to have higher levels of radon. The longer the time spent in a building the greater the exposure time to radon.

How do I know how much radon I am being exposed to?

The only way to know the radon levels in your home or other building is to test for radon. Just because your neighbours may have tested their homes and have low results does not mean your home is low too. How each house is constructed is a significant factor.


As a step towards reconciliation, Interior Health acknowledges the land that we live, work, and play on as the traditional territories of the Dakelh Dene, Ktunaxa, Nlaka’pamux, Secwepemc, St’at’imc, Syilx and Tsilhqot’in peoples. It is with humility that we continue to strengthen our relationships with the First Nation, Métis, and Inuit peoples of the interior.
MoH     PCQO