What is a key benefit of active soil depressurization in mitigating radon?

Active soil depressurization is a highly effective method for mitigating radon, and its primary advantage lies in its ability to create a negative pressure beneath the foundation of a building. This negative pressure works by drawing radon-laden air from the soil before it can enter the home, thereby reducing indoor radon levels significantly.

By maintaining a lower pressure in the soil compared to the building's interior, any radon gas that attempts to infiltrate is effectively redirected and exhausted outside. This proactive approach not only decreases radon levels but also enhances the overall effectiveness of radon mitigation compared to other methods that do not actively control air movement.

The other options, while they may address aspects of radon mitigation or ventilation, do not capture the central mechanism of how active soil depressurization functions in preventing radon entry. For instance, while improving home ventilation is important for overall air quality, it does not specifically target radon gas in the same direct manner as creating a negative pressure does. Thus, the ability to create a negative pressure to prevent radon entry is the key benefit that defines this approach.