Abstract
Radon is a colourless, odourless, radioactive gas emitted naturally from uranium in Canadian rocks and soils. Outdoor concentrations of radon are almost always low, but levels can build up indoors, especially in the lower levels of a building, because radon gas is heavier than air. Once inhaled, the radioactive decay products of radon can adhere to cells lining the lungs and can lead to lung cancer. Health Canada cites radon gas exposure as the second leading cause of lung cancer in Canada, accounting for about 3000 deaths each year, and it is the leading cause of lung cancer among nonsmokers (Chen 2012). Fortunately, exposure to radon is preventable; levels in current structures can be reduced through mitigation, and new buildings can be constructed to prevent radon from entering in the first place.
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