2025 SEPT: RADON TOOLKIT Rev 1: CHILDREN'S ENVIRONMENTAL HEALTH DAY | Page 5

2. Radon and health risks

Radon exposure can have serious negative health impacts, primarily affecting the lungs. When radon gas is inhaled, its radioactive particles can become trapped in the lungs, where they release radiation that damages lung tissue over time. This damage increases the risk of lung cancer, making radon the second leading cause of lung cancer after smoking.
The risk is especially high for individuals who are exposed to elevated radon levels over long periods, and for smokers, whose lung tissue is already compromised.
Because radon is invisible and odorless, many people are unaware of their exposure, making regular home testing crucial for prevention.
Radon is the second leading cause of lung cancer. It is estimated to be responsible for more than 21,000 lung cancer deaths each year in the United States.