Swedish geological survey office radon risk classification, including also factors like radon daughters and type, moisture and porosity of the soil. The classification is primarily meant to help local authorities in regulating land development and building codes and standards
| Classification | Concentration of radon (or daughters) in Bequerel per cubic metre |
|---|---|
| High risk | 50 000 |
| Possibly high risk | Insufficient measurements to definitely classify as high risk but likely to be high (borderline) |
| Normal risk | 10 000 to 50 000 |
| Low risk | <10 000 |