Radon is a known carcinogen. It is estimated that 20,000 deaths occur each year from lung cancer, caused by Radon exposure. Lung cancer caused by Radon exposure is the second leading cause of cancer, followed by smoking. Radon can enter your house from the soil by seeping up through the crawl space, or cracks in the basement slab floor. It is colorless, odorless, and is heavier than air so it tends to accumulate at lower levels. If a Radon Test indicates an elevated reading, certain mitigation procedures can be used to bring it down to an acceptable level.