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Back to Radon Zones in the United States
Radon zones
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| | Zone 3 (41 counties) |
| | Zone 2 (32 counties) |
| | Zone 1 (62 counties) |
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Highest Potential: counties have a predicted average indoor radon screening level greater than 4 pCi/L (pico curies per liter) (red zones) |
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Moderate Potential: counties have a predicted average indoor radon screening level between 2 and 4 pCi/L (orange zones) |
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Low Potential: counties have a predicted average indoor radon screening level less than 2 pCi/L (yellow zones) |
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