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- Zone 1 counties have a predicted average indoor radon screening level
greater than 4 pCi/L (picocuries per liter) (red zones)
- Zone 2 counties have a predicted average indoor radon screening level
between 2 and 4 pCi/L (orange zones)
- Zone 3 counties have a predicted average indoor radon screening level
less than 2 pCi/L (yellow zones)
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