What is a common result of air being classified as "depressurized" below the neutral pressure plane?

When air is classified as "depressurized" below the neutral pressure plane, it means that the indoor air pressure is lower than the outdoor air pressure. This condition leads to a scenario where outside air can be drawn into the home, especially through openings, cracks, and unsealed areas.

The negative pressure within the house creates a situation where air from the outside seeks to equalize the pressure difference. As a result, air flows in from outside, which can include contaminants or radon gas, depending on the geographic and geological factors of the area.

This dynamic is particularly crucial in the context of radon concerns since homes with lower indoor pressure may be more susceptible to higher radon levels, given that radon is a naturally occurring gas that can enter buildings from soil and rock beneath. Thus, understanding the relationship between depressurization and air movement is essential for effective radon measurement and mitigation practices.

The other options relate to potential outcomes tied to various air pressure conditions, but they do not directly address the specific phenomenon of outside air entering a building when it is depressurized relative to the outside.