Radon Potential Hazard Map for Great Britain

Great Britain's definitive map of Radon Affected Areas, produced by the UK Health Security Agency and British Geological Survey. It estimates the probability that a property exceeds the radon Action Level of 200 Bq m-3, supporting legal property enquiries and building regulations.

Use Cases

• Identify Radon Affected Areas for property purchase legal enquiries (CON29) based on the 1% probability threshold.
• Determine required radon protection levels for new building construction using probability estimates.
• Analyze spatial correlation between radon potential and underlying digital geology information from BGS Geology 50k.

Strengths

• Definitive map for Great Britain produced by authoritative agencies UKHSA and BGS.
• Based on UKHSA indoor radon measurements and BGS digital geology information (Geology 50k version 8).
• Provides probability estimates keyed to the established Action Level of 200 becquerels per cubic metre.

Limitations

• Data access requires a license, which may restrict immediate use.
• Confidentiality practices for measurement locations limit granular address-level analysis.
• Probability is an estimate for an area, not a direct measurement for a specific property.

Provenance

Source

British Geological Survey (BGS) and UK Health Security Agency (UKHSA).

Collection Method

Derived from BGS Geology 50k version 8 and UKHSA in-house radon measurement data.

Time Range

null

Freshness

Last updated March 2026.

Geography

Great Britain (England, Wales, Scotland).