Environment

Radon potential

The radon class of every 1 km square in the UK, from the UK Health Security Agency and British Geological Survey's indicative atlas of radon.

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Published by
British Geological Survey and UK Health Security Agency
Level of detail
1 km grid (map point level)
Published for
Map point
Covers
All four nations
Updates
Every few years
Data period
Not recorded for this layer. The dates below are when it was published and fetched.
Published
1 December 2022
Fetched by Open Index
19 October 2026
Licence
Open Government Licence 3.0

Where it covers

  • England
  • Wales
  • Scotland
  • Northern Ireland

How it is made

Open Index shows the figures as British Geological Survey and UK Health Security Agency publishes them, for the areas they were published for: map points.

Larger areas use the publisher’s own figures, never an average of smaller areas.

Before you use it

  • Each 1 km square shows the share of homes in it estimated to be at or above the radon Action Level of 200 becquerels per cubic metre, in six classes. A square takes the highest class found anywhere in it, so part of a square may be lower.
  • This is an estimate for an area, from the rocks underneath and past measurements in homes. It cannot say what radon there is in any one home. Only a test can, and UKHSA sells them at ukradon.org.
  • A square in class 2 or above, where 1% or more of homes are estimated to be at or above the Action Level, is what UKHSA calls a radon Affected Area.
  • Great Britain is from version 3 of the atlas (2022) and Northern Ireland from version 1 (2015). The classes mean the same in both.
  • A detailed report for one address is sold by UKHSA and BGS. This map is the free indicative atlas, which is less detailed.

Colours on the map

Fixed breaks, held for every period, so colours mean the same over time.

Source and licence

Indicative atlas of radon (Great Britain and Northern Ireland)
British Geological Survey and UK Health Security Agency
Edition
Indicative Atlas of Radon: GB v3, NI v1
Published
1 December 2022
Fetched by Open Index
19 October 2026
Licence
Open Government Licence 3.0
Credit line

Contains British Geological Survey materials © UKRI 2022. Radon Potential classification UK Health Security Agency © Crown copyright 2022. Contains OS data © Crown copyright 2020. Contains public sector information licensed under the Open Government Licence v3.0.

Use this data

GET /v1/layers/radon-potential

This snapshot has no download for this layer yet. The catalogue CSV lists every layer with its dates, coverage and credit line.