How is radon primarily transported within homes?

Radon is primarily transported within homes through the soil underneath, as it is a naturally occurring radioactive gas that originates from the decay of uranium in the earth's crust. As radon gas seeps upward from the soil and rock, it can enter buildings through cracks in floors, walls, construction joints, and around service pipes. This process is largely driven by pressure differences, as homes often have lower pressure compared to the ground outside, allowing radon to be drawn into the living spaces.

Understanding the source of radon and its pathways is vital for effective radon measurement and mitigation strategies. While other options mention possible influences on indoor air quality or conditions, they do not serve as primary transport mechanisms for radon within homes. The significant role of the soil underscores the importance of radon testing and the evaluation of indoor air quality in relation to geological factors.