People in radon Affected Area squares
The share of residents who live in a 1 km square that the radon atlas marks as a radon Affected Area, where 1% or more of homes are estimated to be at or above the radon Action Level somewhere in the square.
Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas
- Level of detail
- Middle area
- Published for
- United Kingdom, Nation, Region, Council, Constituency, Postcode area, Postcode district, Town, Ward and Middle area
- Covers
- All four nations
- Updates
- Every few years
- Latest period
- 2022
- Published
- 1 December 2022
- Fetched by Open Index
- 19 October 2026
- Licence
- CC BY 4.0 for the calculation; its inputs under the Open Government Licence 3.0
Where it covers
- England
- Wales
- Scotland
- Northern Ireland
- England6,856 of 6,856 middle areas have a figure
- Wales408 of 408 middle areas have a figure
- Scotland1,334 of 1,334 middle areas have a figure
- Northern Ireland850 of 850 middle areas have a figure
How it is made
Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas.
Each census output area (each Data Zone in Northern Ireland) is placed in the 1 km square of the radon atlas that holds its label point, and its residents are counted there. The share is the residents in squares of class 2 or above (a radon Affected Area) out of all residents placed in a square, added up over the output areas in the area. Residents are the census count (2021, or 2022 in Scotland), and the mid-2024 estimate for Northern Ireland's Data Zones.
Larger areas use the publisher’s own figures, never an average of smaller areas.
Zoom in past middle area level and the map keeps the middle area shapes and says so, rather than inventing detail.
- United Kingdom2022 only
- Nation2022 only
- Region2022 only
- Council2022 only
- Constituency2022 only
- Postcode area2022 only
- Postcode district2022 only
- Town2022 only
- Ward2022 only
- Middle area2022 only
Before you use it
- This counts people, not homes, and places each census output area at one point. It says how many people live where high radon is more likely, not how many homes have it.
- A radon Affected Area is a 1 km square where 1% or more of homes are estimated to be at or above the Action Level of 200 becquerels per cubic metre. Most homes in an Affected Area are below it.
- Each square takes the highest class found anywhere in it, so the share can be higher than a finer map would give.
- It is shown for wards and larger areas only. A neighbourhood sits in one or two squares, so its share would only repeat their class.
Colours on the map
Fixed breaks, held for every period, so colours mean the same over time.
How Open Index describes it
Page text on Open Index comes from this layer’s sentence rules, filled in with published figures. For Hackney:
About 2.0% of people in Hackney live in a 1 km square that the radon atlas marks as a radon Affected Area.
Across the UK the figure is 44.0%.
Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas.
Source and licence
- 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 the calculation as: Worked out by Open Index from the UKHSA and BGS radon atlas and census output areas. It is licensed under CC BY 4.0, with the source credit lines above.
Use this data
The published data archive is on Zenodo: doi.org/10.5281/zenodo.23508848.