Epidemiological studies have shown that naturally occurring radon gas concentrations add to the incidence of lung cancer. While this evidence is derived primarily from studies of miners exposed to radon gas at work, it is supported by the outcome of a number of studies on radon exposure in the home. There is evidence to suggest that long-term exposure to high levels of radon can be a contributory factor in increasing the risk of lung cancer and that the incidence is higher among smokers than non-smokers.
As indicated in reply to Question No. 1267 of 30 September 2003, it would not be practicable in the current budgetary circumstances to provide for Exchequer funding of a radon remediation grant scheme in respect of domestic dwellings. However, upgraded building regulations, introduced in June 1997, require all new houses commencing construction on or after 1 July 1998 to incorporate radon protection measures. The extent of the measures needed depends on whether a house is located in a high radon area. Over the years, through the Radiological Protection Institute of Ireland, the Government has committed significant resources to assessing the extent of the radon problem throughout the country and to increasing public awareness of radon.
The RPII has actively encouraged householders in those areas designated as high radon areas to have their homes measured for radon levels if they have not already done so. My Department's booklet, Radon in Existing Buildings – Corrective Options, provides advice on a range of appropriate remediation options. For example, improved ventilation all year round would be an immediate and non-costly action to prevent the build up of radon gas in the home.