06/11/2026
Key facts about
* Colorless, odorless, and tasteless — you cannot detect it without specialized testing.
* It can seep into buildings through cracks in foundations, gaps around pipes, and other openings.
* It is found everywhere in small amounts outdoors, but it can accumulate to higher concentrations indoors, especially in basements and lower floors.
* Long-term exposure to elevated radon levels increases the risk of lung cancer. It is the second leading cause of lung cancer after smoking.
