The Canadian guideline for radon in indoor air is 200 Bq/m3.

If you’ve tested your home, and the radon concentration is above the Canadian guideline of 200 Bq/m3, Health Canada recommends that you take action to lower the concentrations.

The higher the radon concentrations, the sooner action should be taken to reduce levels to as low as practically possible.


Health Canada recommends that homeowners consult with a Radon Mitigation Professional certified by the Canadian National Radon Proficiency Program (C-NRPP) to determine the best radon reduction method. While the health risk from radon exposure below the Canadian guideline is small, there is no level that is considered risk free. It is the choice of each homeowner to decide what level of radon exposure they are willing to accept.

Find a certified Radon
Mitigation Professional near you

When taking steps to reduce your radon levels, Health Canada recommends taking actions that will reduce your radon levels to as low as possible.

According to research the most efficient method of reducing residential radon levels is through installation of an Active Soil Depressurization (ASD) or a radon mitigation system installed by a certified professional.

Additional, but less effective, methods of radon reduction may include sealing cracks or other radon entry routes or increasing ventilation through balancing or installing an HRV (Heat Recovery Ventilator) or ERV (Energy Recovery Ventilator) system. See Health Canada’s ASD study for more information.

Click here for more information on radon reduction for Canadian homeowners.

Key facts about reducing your radon:

  • A radon mitigation system includes a pipe with a fan attached is installed through the foundation floor and connected to the outdoors through an exterior wall or up through the roof. This system draws the radon from below the house to the outside to prevent it from entering the home.
  • According to Health Canada’s ASD study, when installed by a certified contractor, mitigation systems reduced radon concentrations in homes by an average of 91%
  • Recent data from the Take Action on Radon 2020-21 Radon Reduction Sweepstakes showed that in 455 mitigation systems installed from 2020 to 2021, the average cost of a radon mitigation system was $2,700.
  • A certified professional can be found here