Notes: The first National Radon Survey took place in Ireland between 1992 and 1999. It involved approximately 11,000 measurements. The geographic weighted national average radon concentration at that time was 89 Bq/m3. A link to this report can be found here: <<http://www.epa.ie/pubs/reports/radiation/radonindwellingstheirishnationalradonsurvey.html>>. In 2015, a survey was carried out to update the geographic weighted national average concentration using a stratified random selection of homes based on radon risk and geography. The current estimate of the geographic weighted national is 77 Bq/m3.
  