Short-term and long-term tests can help homeowners to identify high or low levels of radon at home. This information can prevent illness and even save lives. However, you will first need to be able to identify what passes as normal or acceptable. In U.S. states and territories, 4 pCi/l and lower is considered safe. In some other countries, such as Canada, the threshold is slightly lower.

Note that pCi/l is the abbreviated form of picocuries per liter. While this is not the only way to calculate radon, it is the most popular method. If your home reads anything higher than a four, consider conducting another test for confirmation and then contact contractors to resolve the issue.