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Thank you for your interest in testing with the Evict Radon National Study

The Evict Radon National Study is a national research study involving researchers and scientific partners from across Canada who are dedicated to solving Canada’s significant and worsening radon-gas exposure problem. Radon is a substantial cause of lung cancer even in non-smokers. By testing your home with our at-cost, research-grade radon test kits and enrolling in our national, public university-based research study, you are helping researchers from across Canada to understand radon exposure and develop new ways to protect ourselves and loved ones.

Common practice stated that winter is the optimal time to radon test. However, as we collect more data, we have determined little difference between winter and spring radon testing. We do, however, encourage our participants to test over seasonal change. At this time, the best and most accurate radon readings obtained during the spring and summer months are those that are longer than 6 months. 


With your home radon result, we are able to:

  • Better protect Canadians from the harmful effects of radon gas exposure
  • Understand why certain properties have higher or lower radon compared to others
  • Work towards solutions that mean lower radon for everyone
  • Determine what behaviours modify our radon exposure
  • Determine the best pathway forward for best radon testing in Canada

Our current and past Evict Radon research participant have contributed to new ground-breaking research exposing Western Canada’s radon problem. Their contribution is helping us accomplish our mission to ‘evict’ radon from our homes and prevent future cases of radon-induced lung cancer. 

The research has been published in the Nature Publishing Group’s multidisciplinary journal Scientific Reports. Titled “Radon exposure is rising steadily within the modern North American residential environment, and is increasingly uniform across seasons”. You can download a free copy of the journal below. 


Key Findings from the research: 

1. Radon exposure in Canada is increasingly uniform across the year

We have found that the existing dogma – that radon is always highest during winter heating months no longer applies in the Canadian context. Indeed, nearly half of residences we examined showed consistent radon all year, and a quarter demonstrated higher radon levels in summer. We are working towards understanding why this is now.

We speculate that this trend may be another consequence of the rising air-tightness of buildings in the region, but that this is also coupled with the growing prevalence of air conditioning units. 

2. Short-term radon test kits (less than 90 days) are not reliable

Findings show radon tests of less than 90 days are imprecise in measuring radon gas exposure up to 99 percent of the time. The implications are likely to impact the home inspection and real estate industry, where adoption of short term testing in Canada has begun. We conclude that short-term testing should, under no circumstances, be used as a basis for long term radon exposure estimates

3. Our radon problem in Canada is, unfortunately, getting worse  

We find a troubling, progressive increase in radon exposure within the modern residential environment in Canada. We show that the relative ‘modernity’ of residential environment strongly impacts radon exposure, with newer homes containing greater and greater radon. 

4. Home metrics correlated with increased radon 

Variables that influence radon are:

  1. Year of construction with newer homes showing higher radon 
  2. Building type with the bungalow showing higher radon
  3. Square footage – larger sqft means higher radon 
  4. Ceiling height with homes with higher ceilings showing higher radon
  5. Opening and closing of windows. 

Things that did not influence higher radon include:

  1. Thermostat setting 
  2. Presence of basement plumbing  

5. Alberta and Saskatchewan are home to the 2nd most radon-exposed population on Earth 

Of 11,727 residential long-term radon tests conducted between 2010-2018 in Alberta and Saskatchewan, 55% were ≥100Bq/m3 and 17.8% were ≥200Bq/m3, the maximum tolerated exposure limit for Canada. Comparison to global radon levels this region encompasses one of the most radon-exposed large populations mapped to date.

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