Radon gas comes from the decay of radioactive uranium found naturally in rocks and soil—the same rocks and soil that surround your home and that make up the concrete foundation on which it sits. According to the National Cancer Institute, lung cancer deaths due to radon poisoning are second only to those caused by cigarette smoking. Radon is present in all the air we breathe in harmless concentrations, but can pool and gather in enclosed areas such as a house or basement. It’s easy to see why radon testing and monitoring systems are essential to a safe home.