Radon is a colorless, odorless gas that occurs naturally as a byproduct of the decay of uranium in soil, rock, and water. It is part of the noble gas group on the periodic table and is known for being radioactive. Because it can seep into buildings, particularly in basements and lower levels, it is important to monitor radon levels in homes to ensure safety. Exposure to high levels of radon over time can increase the risk of lung cancer, making it a significant health concern. Testing for radon is straightforward and can be done using various kits available for homeowners. Reducing radon levels often involves improving ventilation or sealing cracks in floors and walls.