Which of the following best describes radon?

Radon is indeed best described as a naturally occurring gas found in soil. It is a colorless, odorless radioactive gas that is produced from the natural breakdown of uranium in soil, rock, and water. This process occurs naturally over time, and because radon is a gas, it can move through the ground and enter buildings through cracks and openings in the foundation.

Understanding the nature of radon is crucial for real estate professionals, especially in the context of property sales and safety. Since radon is a health hazard linked to lung cancer, awareness of its presence and levels in a property is vital for homebuyers and owners.

The other options do not accurately represent radon: it is not a manufactured chemical; it is not simply a product of poor air quality; and it does not originate from defective appliances. Recognizing radon’s natural origin is essential for understanding its implications in real estate and the importance of testing and mitigation in affected properties.