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Radon in homes can increase risk of lung cancer

November is Lung Cancer Awareness and Radon Action Month. Learn about one of the leading causes of lung cancer in B.C. and how to test for it in your home.
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​Dr. Kong Khoo was stunned when he was diagnosed with stage I lung cancer in March 2020 during a routine medical exam.  

Dr. Kong Khoo (top right) with his familyDr. Khoo immediately ordered a digital radon detector to measure the level of radon gas in his home of 25 years. The non-smoking oncologist with BC Cancer in Kelowna found the radon levels were significantly higher than Health Canada’s radon guideline level of 200 Bq/m3.  

“The radon detector was the most important thing I’ve bought in my life,” he said. 

Radon is one of the leading causes of lung cancer in BC.  It is a naturally occurring radioactive gas that’s produced when uranium breaks down in soil and rock. When radon gas mixes with outside air it usually gets diluted quickly and isn’t a health concern. But when it seeps into homes through cracks in floors, walls and foundations, it can build up to harmful levels. 

“Lung cancer linked to radon is completely preventable, yet each year, almost 5,000 people in Canada are diagnosed with it,” says Dr. Xuan Zhao, a resident physician in Public Health and Preventive Medicine at the BC Centre for Disease Control (BCCDC). 
“You can’t see it, smell it, or taste it. That’s why it’s so important for everyone to know about radon, test for it, and take action to reduce our exposure.” 

What should I do about radon?  

Radon is the number one cause of lung cancer in non-smokers and the second leading cause of lung cancer for smokers. One in 10 smokers develop lung cancer, but add in long-term exposure to high levels of radon and the risk of lung cancer risk increases to one in three.
Watch this short video to learn more about radon, cancer risk  and what you can do to lower your exposure

Dr. Zhao explains that once it’s in the home, radon can break down into other radioactive particles that damage cells lining the lungs when inhaled. The tissue in our lungs is thin and delicate, so progressive damage over years can develop into cancer. 

Health Canada recommends taking action to reduce radon in homes where the average annual radon concentration is higher than 200 Bq/m³ within two years.  In homes with radon over 600 Bq/m³, they recommend acting within one year. 

Dr. Cheryl Peters“British Columbians can take the first step to reducing their exposure to this cancer-causing gas by testing their homes,” says Dr. Cheryl Peters, a senior scientist for cancer prevention at B.C. Cancer and the BCCDC. 

Dr. Zhao adds that radon tests are easy to do, either on your own or through a certified radon professional.

“We know radon is more common in Interior and Northern BC and in the Fraser Valley, but every part of B.C. has homes with high levels of radon. No matter the age, building type, or location of your home, the only way to be sure of the radon level in your home is to test,” she says.


After Dr. Khoo tested his home, he immediately hired a specialist to reduce radon levels by installing a system to safely divert the gas through a pipe under his house. 

“The irony of the situation isn’t lost on me,” admits Dr. Khoo, who sees first-hand the devastating effects of lung cancer on his patients. “I should have tested and acted years ago to protect myself and my family.” 
Dr. Khoo is grateful his cancer was caught early and successfully removed with surgery. 

He continues to share his story – particularly during the month of November, Lung Cancer Awareness Month and Radon Action Month. 
“I urge every homeowner to protect themselves and their family by checking for radon and taking any required mitigation measures."

Radon resources for people in B.C. 

A great starting point to see how common elevated levels of radon are in your community is the BCCDC online radon map. Radon levels vary widely across the province and can be different even within the same neighbourhood. Everyone, regardless of where they live in B.C. or the age of their house, should test their home for radon.  

Long-term testing kits, which are the most accurate, are sold by the BC Lung Foundation and start at $50 and may also be available free-of-charge in certain parts of the province. Listed below are a few resources for radon detectors: 
If you find high levels in your home, a professional certified with the Canadian National Radon Proficiency Program (C-NRPP) can work with you to figure out what type of mitigation system works best for your home and budget.
As the high cost of radon reduction systems can be a barrier for some people, the Canadian Lung Association has a Grant Program to partially fund radon reduction systems for those with lower income.




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