Why Radon is dangerous?
Radon gas causes lung cancer. It is a threat to your health because radon collects in homes and buildings. Radon is the biggest source of exposure to naturally occurring radiation. Radon is the second leading cause of lung cancer and kills more then 21,000 people each year.
The conclusion that radon is a serious health risk is supported by the Surgeon General of the United States, the U.S. Environmental Protection Agency, the American Lung Association, the National Academy of Science, and the National Council on Radiation Protection.
Not everyone exposed to radon develops lung cancer; but as the level of radon and length of exposure increase, so do the health risks.
The EPA-recommended action level is not a safety standard. Levels below 4.0 pCi/L still represent some risk. Even outdoor air contains some radon.
The United State Environmental Protection Agency and the Surgeon General recommend that people not have long-term exposure in excess of 4.0 pico Curies per liter of air (pCi/L).