Why have both an Action Level and a Target Level for radon?
The Action Level identifies radon levels above which action is most urgent but it is important that substantial reductions are made – not just aiming to get under the Action Level. The Target Level of 100 Becquerels per cubic metre aims to encourage householders to make major reductions in their radon level – to below the Target Level if possible. Health risks below the Action Level are smaller but not zero. HPA advises householders with radon between the Target Level and the Action Level to seriously consider reducing their radon levels – especially if the household includes smokers or ex-smokers who are at greater risk from radon.
