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To help people know the potential for high radon in
their regions, the U.S. EPA has published a nationwide Map of Radon Zones.
On the map, zone 1 equals high potential, zone 2
equals moderate potential and zone 3 equals low potential.
The high potential zone predicts a potential indoor
radon screening level greater than 4 pCi/L. In Illinois, zone 1 covers the
central and northern half of the state, including McLean County. Although
this map may be helpful in predicting potential radon concentrations, it
should not be used to predict individual home radon concentrations.
Only a radon test can determine the actual radon
level.
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