Radon gas is invisible, and it has no odor or taste. Radon may be found in all types of homes and buildings in the United States. If there is radon gas in the ground, it can seep into a building. Radon typically moves up from the ground into a home through drains, cracks or other holes in the foundation. Radon then can be trapped inside the home.
Studies show that radon is the second leading cause of lung cancer, behind cigarette smoking.
The higher the radon level indoors, the greater the amount you breathe. Radon gas decays into radioactive particles that can get trapped in your lungs when you breathe. As they break down, these particles release small bursts of energy. This can damage lung tissue. Inhaling indoor air containing radon over a period of many years can increase your risk of getting lung cancer.