Radon an typical chemical contaminants was ignored by many people

Adverse health effects normally come from long-term exposure and do not reflect acute symptoms. Radon is a naturally occurring radioactive gas that is formed from the breakdown of uranium in the ground. Radon can escape from the ground into homes and accumulate to high levels, often in the lower levels of the home such as basements. All homes should be tested for radon to be sure the exposure level is below the Canadian guideline of 200 Bq/m3. You can have someone do the radon test for you, or you can purchase a testing kit which you subsequently send to a laboratory for analysis. Measuring over a long period is more likely to give representative results than short-term measurements.

Exposure to radon, a process known as radiation hormesis, has been suggested to mitigate auto-immune diseases such as arthritis.