Radon is a naturally occurring radioactive gas which may be found in indoor environments such as homes, schools, and workplaces.
Radon is the most important cause of lung cancer after smoking.
Radon is estimated to cause between 3–14% of all lung cancers in a country, depending on the national average radon level and smoking prevalence.
The lower the radon concentration in a home, the lower the risk of lung cancer as there is no known threshold below which radon exposure carries no risk.
Well-tested, durable and cost-efficient methods exist for preventing radon in new houses and reducing radon in existing dwellings.