The latest and largest-ever epidemiological study on the risks of residential radon lead by the University of Iowa. At the EPA "action level" (4 pCi/L), the lung cancer risk to women increases by 50%. (May, 2000)
A Citizen's Guide to Radon (1992). Home Buyer's and Seller's Guide to Radon (1993). A Physician's Guide to Radon (1993). Consumer's Guide to Radon Reduction (1992). Radon Mitigation Standards (1994). Radon Resistant New Construction.
Illustrated guides from the University of Minnesota on the common problems and water drainage systems. Relative humidity above 50% may cause structural and health problems; molds and mildew thrive in relative humidity above 60% to 70%. Dehumidifiers can damage the basement.