The concentration within a building is highly dependent upon the underlying soil composition and building construction, or routes of entry. Concerns Radon is a colorless, odorless, tasteless radioactive gas that may accumulate in enclosed buildings. When the concentration increases, the amount inhaled increases. The small radioactive particles may get trapped in the lungs and continue to decay, which may cause tissue damage. A prolonged exposure to high levels of radon has been linked to an increased risk of lung cancer.
Most scientists agree that it is carcinogenic, although, there are a few skeptics.
At this time, lung cancer is the only known health risk. However, radon standards and risk evaluations developed by the EPA have recently fallen under controversy and may be considered too conservative by some. Studies done by the EPA were based upon cancer incidences in underground miners . Obviously, a smoker has a higher risk of developing lung cancer than a nonsmoker does. The EPA and others are currently conducting studies of more typical populations.