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Radon is a chemical element with symbol Rn.  It is a noble gas, colorless, odorless and radioactive occurring mostly naturally as the decay product of radium but also uranium.

Because it is a little heavier than air, radon is more likely to settle and cause harm in a building’s low, non-ventilated area, such as a basement.  Enough radon gas can seeps out of soil into basements and crawl to pose a health risk to homes residents

Exposure to radon is the second leading cause of lung cancer after smoking.  Therefore it’s important to perform test to know if there is a risk and if radon level need to be reduced

Risk and consequences related to radon are well documented by public organization:

Health Canada


U.S. National Cancer Institute


U.S. Environmental Protection Agency (EPA)


Cancer Care Ontario


Health Canada recommends radon level 200 Bq/m³ (5.4 pCi/L) as an upper limit, while the US Environmental Protection Agency fixed the limit to 4.0 pCi/L (148 Bq/m³)

Conversion rate between theses two unit is:  1 pCi/L = 37 Bq/m³