Some simple actions such as sealing around loft-hatches and large openings in floors, and extra ventilation may reduce exposure however, they do not reduce radon levels on their own. These actions should be combined with other effective measures.
Examples of effective measures include:
- Radon sump - an active radon sump, fitted with a fan, is the most effective way to reduce indoor radon levels. Sumps work best under solid floors and under suspended floors if the ground is covered with concrete or a membrane. Occasionally, passive sumps without a fan may reduce radon levels.
- Positive ventilation - a small quiet fan blows fresh air, usually from the roof space, into the building.
- Natural under-floor ventilation - many homes and some workplaces have a suspended ground floor with a space underneath. Good ventilation of this space can reduce radon concentrations.
- Active under-floor ventilation - a fan is used to either continuously blow air into or extract air out from the space below a suspended floor. This can be used when natural under-floor ventilation is inadequate to reduce radon level.