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Page updated on February, 2019
(Based on 447,868 radon data points)
The map is based on 447,868 data points.
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. Home owners 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."