What Is Radon Gas? A Chicago Homeowner's Complete Guide

Radon is a radioactive noble gas that forms naturally when uranium in soil and rock decays. It is colorless, odorless, and tasteless — properties that make it impossible to detect without specialized equipment. The U.S. Environmental Protection Agency (EPA) classifies radon as a Group A human carcinogen and the second-leading cause of lung cancer in the United States, responsible for approximately 21,000 deaths annually.