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A programme, supported by funding from the Northern Ireland Environment Agency (NIEA), identified homes with radon concentrations above the Action Level of 200 Bq m3 in the Armagh, Cookstown and Dungannon areas of Northern Ireland.
Householders in the areas where the radon potential is at least 5% were contacted by letter and offered a free radon test. Where high levels were found, householders were encouraged to reduce radon concentrations.
The programme commenced in January 2011 and was based on the then current radon atlas of Northern Ireland.