Here is a position statement from CARST for real estate transactions High levels of radon are known to occur randomly in homes in all provinces. We believe that all real estate agents and brokers should encourage buyers to take a radon test. The test should be performed at the time of purchase if the seller has not already performed a recent certified radon test. The test should be performed according to Health Canada recommendations. Radon is a radioactive gas that has been classified as a Group 1 carcinogen and which, according to Health Canada, is responsible for approximately 3,200 lung cancer deaths per year in Canada, and of this number approximately 1,000 people in Quebec province. Radon occurs naturally outdoors at low concentrations and in this environment, it does not pose a serious health risk as it is diluted to very low levels. However, radon concentrations can reach high levels inside homes, which can potentially put the health of the occupants at great risk. Elevated radon levels in homes can be caused by a number of reasons such as the underlying geology, construction design, installed mechanical equipment and/or the natural stack effect inside the house. It is prudent for the buyer to understand the environment of the home they are buying. CARST (Canadian Association of Radon Scientists and Technologists) also encourages all sellers to strive for certified radon testing, as described above, before listing their home for sale or rental. If high levels of radon are identified during the test, this should not be considered a barrier to selling a property. Regardless of building type or radon levels detected, all homes can be easily repaired, in most cases in less than a day, by a Certified Radon Mitigation Technician.