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Radon is a radioactive gas that causes cancer. Radon is found in rock, soil, water, some building materials, and natural gas. You can't see, taste, or smell it.
Any home, school, office, or other building can have high levels of radon. Radon is found in new and old buildings. It can seep in through any opening where the building contacts the soil. If a house's water supply contains radon, radon may enter the air inside the house through pipes, drains, faucets, or appliances that use water. Then the radon may get trapped inside the house.
Studies show that nearly 1 out of 15 homes in Canada has unsafe levels of radon.footnote 1 If you live in an area that has large deposits of uranium, you may be more likely to be exposed to high levels of radon. But the construction features and exact location of your house may be just as likely to affect your risk. Even houses right next to each other can have very different radon levels.
Over time, exposure to radon can cause lung cancer. Radon causes about 4,000 lung cancer deaths each year in Canada. It is the second leading cause of lung cancer, after tobacco smoking.footnote 1 People who smoke have an even higher risk of lung cancer from radon exposure than people who don't smoke.
Radon exposure doesn't cause symptoms. Unless your home or office is tested for high radon levels, you may not realize that you are being exposed to dangerous levels of radon until you or someone in your family is diagnosed with lung cancer.
Health Canada recommends that all homes be tested for radon levels.
You can hire a qualified tester to do the test, or you can use a do-it-yourself test kit. You can buy radon test kits on the Internet or from home improvement stores. You can also contact your provincial environmental office for advice. There are short-term and long-term tests available. Both measure radon levels in the air. But Health Canada only recommends the use of the long-term test.
Health Canada recommends placing the test kit in your home on the lowest level that you regularly use. If you have questions about radon in your house, you can get help from Health Canada by calling 1-855-809-6966.
If tests find a high level of radon, you'll need to reduce it. There are two parts to this:
Health Canada recommends that you use a contractor certified by the Canadian National Radon Proficiency Program (C-NRPP). Hire a contractor with proper training in radon reduction to help with this work. For a list of certified radon professionals in your area, you can call C-NRPP at 1-855-722-6777 or go to www.c-nrpp.ca.
After radon reduction or prevention procedures are done, the home or building should be retested. You may need to retest more than once. It is usually safe to live in the home or building while the radon is being vented, but you may want to confirm this with your provincial environmental office.
For general information about removing or reducing radon in your house, you can call your provincial environmental office or go to the Health Canada website at www.healthcanada.gc.ca/radon for more information.
CitationsHealth Canada (2012). It's your health: Radon. Available online: http://www.hc-sc.gc.ca/hl-vs/iyh-vsv/environ/radon-eng.php.U.S. Environmental Protection Agency (2010). Consumer's Guide to Radon Reduction. Available online: http://www.epa.gov/radon/pdfs/consguid.pdf.
Current as of: March 2, 2023
Author: Healthwise StaffMedical Review: Anne C. Poinier MD - Internal MedicineDonald Sproule MDCM, CCFP - Family MedicineAdam Husney MD - Family MedicineE. Gregory Thompson MD - Internal MedicineKathleen Romito MD - Family MedicineR. Steven Tharratt MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology
Current as of: March 2, 2023
Author: Healthwise Staff
Medical Review:Anne C. Poinier MD - Internal Medicine & Donald Sproule MDCM, CCFP - Family Medicine & Adam Husney MD - Family Medicine & E. Gregory Thompson MD - Internal Medicine & Kathleen Romito MD - Family Medicine & R. Steven Tharratt MD, MPVM, FACP, FCCP - Pulmonology, Critical Care Medicine, Medical Toxicology
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