TESTING IS THE ONLY WAY TO KNOW.
Health department data for Johnson County,
Kansas indicates about 48% of homes are above EPA guidance, with an
average indoor radon concentration of 5.3 pCi/L. Most of the entire Kansas
City area shows similar data, with about 1 in every 3 homes to be above
EPA guidance of 4.0 pCi/L.
Levels between 4-20 pCi/l are very common. Homes are only occasionally far above 20 pCi/l.
Red
(Zone 1)
counties are those where health department survey data has
indicated an average indoor radon concentration greater than the EPA action
level of 4.0 pCi/L.