Zone 1

Zone 1 counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico curies per liter) (red zones) Highest Potential

Zone 2

Zone 2 counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones) Moderate Potential

Zone 3

Zone 2 counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones) Low Potential