How does radon exposure occur in homes?

Radon exposure in homes primarily occurs due to the natural decay of uranium found in soil, rocks, and water. As uranium decays, it produces radon gas, which can seep up through the ground and enter buildings, especially in areas where the geology is conducive to radon accumulation, such as places with high uranium content. Once radon gas is inside a home, it can accumulate in poorly ventilated spaces, increasing the risk of long-term exposure for the occupants. This is why it is crucial for homeowners in at-risk areas to test for radon and implement measures to mitigate its presence if levels exceed safe thresholds.

While cooking practices, water supply contamination, and industrial waste emissions may contribute to other forms of exposure to harmful substances, they are not the primary pathways for radon exposure specifically, making the option related to natural uranium decay the most relevant in this context.