Notes: Based on the obligation from the transposition of the EU BSS Directive, Cyprus has established a national radon action plan and launched a national radon survey, starting from September 2019 and ending in December 2021. It comprises two phases: the first is about measuring radon concentrations in private houses and the second phase is about monitoring the situation in workplaces, schools, public buildings and other places of interest. Therefore, the arithmetic mean and geometric mean referred to in the following questions are net yet available.  