The best threat of radon direct exposure arises in buildings that are airtight, insufficiently aerated, and also have foundation leaks that allow air from the dirt right into cellars and home areas. WHO presented in 2009 a suggested recomm…

EPA life time security criteria for carcinogens are developed based upon a 1 in 100,000 risk of fatality. Most researchers concur that the risk of death for radon at 4 p Ci/L is approximately 1 in 100. At the 4 p Ci/L EPA radon action stan…