Updated radon map for Great Britain published

The update to the radon potential map of Great Britain, produced by the UK Health Security Agency (UKHSA) and BGS, is the first in over 10 years and provides an authoritative analysis of the likelihood of a building being in a ‘Radon Affected Area’ (an area with higher radon potential). 

Radon (chemical symbol: Rn) is a colourless and odourless gas that 1100 lung cancer deaths per year are attributed to in the UK. The risk is highest among smokers and ex-smokers.

For most people, the risk of developing lung cancer from exposure to radon remains low and levels of radon have not increased across the UK. However, UKHSA advises you to test your home if you live or work in a Radon Affected Area. There are several methods of reducing high radon levels in buildings.

The latest update to the radon map, available to view on the UKradon website, is the product of years of new analysis and research, combining the latest geological mapping with one of the largest databases of in-home measurements ever compiled. 

Whilst the vast majority of buildings remain outside Radon Affected Areas, this new map has refined our knowledge of areas where high radon levels are more likely to occur. The overall number of buildings with high radon levels remains the same.

The radon map allows local councils, national and regional governments, social and private landlords, private homeowners and employers to assess the radon risk in their properties. It is also used in building regulations to inform where radon preventative measures should be incorporated in new buildings.

While the vast majority of buildings remain outside Radon Affected Areas, if the property you own is in an affected area, it is important that you arrange for a test. If you live in private or social rented accommodation, speak to your landlord, who should organise a test for you to carry out.

Employers can use this map to help undertake a suitable and sufficient risk assessment and take appropriate action where necessary.

The updated maps provide information that allows property owners, landlords and employers to make informed decisions on the benefits of undertaking radon measurements and potential remediation work.

Tracy Gooding, principal radiation protection scientist at UKHSA.

Radon occurs in all rocks and soils. Using a revised statistical approach to our mapping of geology across Great Britain has enabled us to model where this geohazard is more likely to be present in buildings.

This map is a significant update to the previously published version and will help to raise awareness about this geohazard.

Russell Lawley, BGS Principal Geologist.

UKHSA has published guidance for Radon Affected Areas. Further information on techniques available to lower elevated levels of radon are also available.

Radon data available through BGS

• A GIS compatible version of the indicative atlas is available to download free of charge on the BGS website.
• The definitive atlas is available at 25m resolution and can be licensed for use within a GIS. Further information on costs and limitations of use are also available on the Radon Potential dataset webpage.
• Individual property probabilities can be found either from a radon risk report or by obtaining a GeoReport. For large property portfolios a property risk assessment can be undertaken. Further information is available on the UKradon.org website.