Radon probability, already linked to every property.

The national radon susceptibility map, classified into four categories:

Particularly high susceptibility: areas with alum shale in the ground.

High susceptibility: at least 20% of homes are estimated to have radon above 200 Bq/m³ (with 70% statistical confidence).

Medium to low susceptibility: up to 20% of homes above 200 Bq/m³.

Uncertain susceptibility: not enough data to set a category.

The dataset is based on indoor air measurements from the national database of Statens strålevern (NRPA) and geological data from Norges geologiske undersøkelse (NGU) (bedrock at 1:250,000 and loose masses at 1:50,000 to 1:1,000,000). The indoor air measurements were used to classify geological units, and this knowledge was then applied to areas without direct measurements. Distributed by Norges vassdrags- og energidirektorat (NVE).

Do not use the dataset to predict radon in individual buildings. The resolution is no better than 1:50,000, and the only reliable way to know the radon level in a specific home is to measure it. It is still an important first assessment for municipalities in land-use planning, and for developers who must decide whether a radon barrier is needed under TEK17. Related: Radon susceptibility (Geodata's parallel model), Bedrock, Loose masses. Part of our Risk map layers.

When the underlying geology or measurement data changes. Last updated 9 September 2026