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Page updated on July, 2017

(Based on 407,730 radon data points)

"Note: These maps show only general trends in radon concentrations. The concentration found in any given home can be substantially higher or lower than the average for a county or even a zip code area. Homeowners in all parts of the state are therefore advised to test their houses to make sure that the radon concentrations are below 4 pCi/l."

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