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Median radon concentration was 123. singapore 4d com 5 Bq/m 3 (interquartilic range: 59-345 Bq/m 3), with a range of 16-3 039 Bq/m 3 Of all radon measurements, 27% (n=67) were above 300 Bq/m 3, which is the radon threshold admitted by the new European Directive Median radon concentration was 251 Bq/m 3 in Galicia (n=126), followed by Madrid with 61 5 Bq/m 3 (n