Northern Ireland Radon Potential Map for Building Regulations

Joint Public Health England and Geological Survey of Northern Ireland data provides the definitive map of radon Affected Areas in Northern Ireland. The map estimates the percentage of homes exceeding the radon Action Level of 200 Bq m-3, based on indoor radon measurements and digital geology information.

Use Cases

• Analyze the correlation between digital geology information and radon Affected Areas to identify high-risk geological formations.
• Use the estimated percentage of homes exceeding the Action Level to prioritize radon testing and mitigation programs in specific regions.
• Apply the radon Potential map as a foundational layer for assessing compliance with Building Research Establishment guidance BR-413 for new constructions.

Strengths

• Definitive map for Northern Ireland produced by authoritative public health and geological agencies (PHE, GSNI, BGS).
• Based on actual indoor radon measurements integrated with detailed 1:10,000 or 1:250,000 scale digital geology data.

Limitations

• Access to the underlying indoor radon measurement data is restricted to maintain location confidentiality.
• The map's methodology and underlying guidance document (BR-413) date from 2004, which may not reflect current building practices or risk models.

Provenance

Source

British Geological Survey (BGS), in collaboration with Public Health England (PHE) and the Geological Survey of Northern Ireland (GSNI).

Collection Method

Combines PHE indoor radon measurements with GSNI-provided digital geology information at specified scales.

Time Range

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Freshness

Dataset metadata indicates a last update in March 2026, suggesting ongoing maintenance.

Geography

Northern Ireland