The World Health Organization has just made a recomendation, based on new research, that lowers the level at which homeowners should take action to remediate effects. The WHO believes that up to 14% of all cases of lung cancers, including those in the United States, are caused by the presence of radon. Testing is relatively easy, and locally remediation usually costs less than $2,000. Certainly more important than buying that new sofa. Consumer Reports has just rated those kits found to be most reliable. Link to the WHO report.