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World radon levels by country.

International radon concentration is meausred in Bq/m3 whereas American radon concentration is measured in pci/L. 1pci/L=37 Bq/m3. Average Radon Concentrations throughout the world reported from the Report of the United Nations Scientific Committee 2000.

This map was provided by Dr. Dan Steck and his students from "The Minnesota Radon Project." They are located in the Physics Department at St. John's University in Collegeville, Minnesota.