What can I do to reduce indoor radon levels? Health Canada recommends that the higher the radon concentration, the sooner you should take steps to remediate the issue.
Over 600 Bq/m3 - Remediate within 1 year
Between 200 and 600 Bq/m3 - Remediate within 2 years
200 Bq/m3 and below - No action required
Health Canada continues "If your home tests above the guideline you should hire a certified radon professional to determine the best and most cost effective way to reduce the radon level in your home. The most common radon reduction method is called sub-slab depressurization. With this solution a pipe is installed through the basement sub-flooring to an outside wall or up through to the roof line with a small fan attached which draws the radon from below the house to the outside before it can enter your home. This type of system can reduce the radon level in a home by over 90%. Increasing ventilation and sealing major entry routes can also help reduce radon levels but their effectiveness will be limited depending on how high the radon level is and the unique characteristics of each home."