Radon and Lung Cancer: What Every Calgary Homeowner Should Know

Radon does not get the attention it deserves, and that is partly because it is silent. There is no smell, no visible sign, and no immediate symptom. Yet radon is recognized as the second leading cause of lung cancer overall and the number one cause among people who have never smoked. For Calgary families living in a higher-risk region, understanding this risk is the reason testing matters.

How Radon Harms the Lungs

Radon is a radioactive gas. When you breathe air containing radon, the gas itself is mostly exhaled — but as radon decays it produces tiny radioactive particles called decay products, or progeny. These particles can lodge in the lining of your lungs. As they continue to break down, they release small bursts of radiation that damage the DNA of nearby lung cells. Over many years, this accumulated damage can lead to cancer.

The key word is years. Radon does not cause illness overnight, which is exactly why it is so easy to ignore. The risk builds quietly over a long period of exposure.

The Numbers That Matter

Health Canada attributes thousands of lung cancer deaths in Canada each year to radon exposure. The risk rises with both the concentration of radon and the length of time you are exposed to it. This is why Health Canada set a guideline of 200 becquerels per cubic metre (Bq/m³): homes above this level should be remediated, and reducing levels as low as reasonably achievable is always beneficial. There is no concentration of radon that is completely risk-free, but lowering your level meaningfully lowers your risk.

Smoking Multiplies the Danger

Radon and tobacco smoke are a particularly dangerous combination. For people who smoke or have smoked, exposure to elevated radon dramatically increases lung cancer risk — far more than either factor alone. If anyone in your household smokes, reducing radon is one of the most protective steps you can take. But it is essential to remember that radon harms non-smokers too; it is the leading cause of lung cancer in people who have never lit a cigarette.

Why Calgary Homes Deserve Special Attention

Alberta's geology produces a steady supply of radon in the soil, and our cold-climate building and heating habits tend to trap it indoors. Finished basements — common and beloved in Calgary — are often where families spend significant time and where radon concentrations are highest. The combination of a high-risk region and below-grade living space means exposure here can quietly add up.

The Encouraging Truth

Here is the most important point: radon-induced lung cancer is largely preventable. Unlike many cancer risk factors, radon is something you can measure precisely and reduce with proven technology. A long-term test tells you your exact level. If it is elevated, a properly installed mitigation system reliably brings it down to a small fraction of the guideline. You can effectively remove this risk from your home.

What You Can Do This Month

1. Test your home. A long-term test over 90 days during the heating season gives the most accurate read of your average exposure.
2. Act on the result. If you are above 200 Bq/m³, plan for mitigation. If you are near it, consider reducing further, since there is no fully safe level.
3. Re-test after mitigation. Confirm with a follow-up test that your system has done its job.

Peace of Mind Is Affordable

Few health risks are as serious as radon yet as straightforward to eliminate. At Onyx Radon, our C-NRPP certified team helps Calgary families measure their exposure and, where needed, install mitigation that delivers rock-solid protection. Testing is inexpensive, and knowing your number turns an invisible threat into a solved problem.

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