Thank you for your interest in testing with Evict Radon

Evict Radon is a Canadian non-profit organization 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 one of our non-profit, research-grade radon test kits and enrolling in our national, public university-based research study, you are helping Evict Radon-aligned researchers from across Canada to understand radon exposure and develop new ways to protect ourselves and loved ones.

Common practice states 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. 

Radon levels can be measured using several different technologies. Although there are pros and cons to specific kinds of test types, the most important thing to do is to test a building for a long period of time (~3 months or more).

The amount of radon entering a building can fluctuate up and down quite a lot over a short period of time. From day to day, or even from hour to hour, radon can be very high or very low. This is normal and is influenced by many factors, such as how your home ‘breathes’ outside air, furnace use, the weather and even geologic phenomena.

As a result of these normal fluctuations, measuring radon over a short period (hours or days) will often give a false reading compared to what is the average for a long period (several months). This false reading can be a false positive or a false negative, meaning you might think you have a problem when you don’t, or (worse) you think you’re safe when you are not.

A precise radon test (that gives you a reading = actual amount of radon you are being exposed to over the long term) requires a measurement taken over several months ideally 3 or more.

A study of 776 Canadian ‘closed house’ short (5 day) and long (90+ day) radon tests showed that long term testing was precise >96% of the time. In contrast, short term testing was “wrong” (meaning the short term test failed to predict the long term test outcome) 20-98% of the time depending on season.

Reference: Stanley et al. Radon exposure is rising steadily within the modern North American residential environment, and is increasingly uniform across seasons. In Press, 2019.

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