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What method is recommended to mitigate radon gas in buildings?
Using air fresheners to mask the smell
Sealing foundations and using subsurface ventilation
Installing additional electrical outlets
Increasing the number of windows for natural light
The correct answer is: Sealing foundations and using subsurface ventilation
Sealing foundations and using subsurface ventilation is the recommended method because it reduces the amount of radon gas that can enter a building from the ground. Using air fresheners may mask the smell of radon, but it does not address the underlying issue. Installing additional electrical outlets or increasing the number of windows for natural light will not have any impact on reducing radon gas levels in a building.