What is the most effective strategy for reducing radon levels in a home?

The most effective strategy for reducing radon levels in a home is preventing radon entry. This method directly addresses the source of the radon gas, which typically infiltrates the home through cracks in foundations, walls, or floors, as well as through construction joints and gaps around service pipes. By implementing measures such as sealing these entry points, homeowners can significantly reduce the amount of radon that enters the living space.

Other methods, while potentially helpful, do not directly eliminate the source of radon exposure. For instance, sealing windows can provide a minimal barrier against outdoor air but does not effectively stop radon from entering through other, more permeable openings. Installing air purifiers may improve indoor air quality by filtering out particulates but will not significantly affect the levels of radon gas itself. Increasing ventilation can help reduce radon concentrations by diluting the gas with outside air; however, it does not prevent radon from entering the home in the first place.

Therefore, proactively preventing radon entry is the most comprehensive and effective approach to mitigating radon exposure.