This work presents the results from measurements of radon concentrations in primary and high school education institutions-including their gymnasiums-from the Chisinau municipality and various rayons from the central and southern part of the Republic of Moldova. In the research carried out during the years of 2013-2014 and 2021, there were 78 (29 + 49) premises included, respectively, and 149 and 23,805 investigations were performed using RTM-1642 (active measurements) and RadonEye(+2) devices (passive measurements). The results show an essential variability for the studied radio-stressogenic factor, depending on the geological conditions of the location of the premises and the age of the building. Thus, during 2013-2014, the minimum concentration of radon detected was 26 Bq m(-3), and the maximum detected was 607 Bq m(-3). In 2021, the results denote an indicator variability in the range of 17.4-657.9 Bq m(-3) for early education institutions, with an average value of 127.6 Bq m(-3), and denote a range of 231.8-1129.3 Bq m(-3), with an average value of 665.4 Bq m(-3)), for high school education institutions and their gymnasiums. The effective annual dose for the children in a classroom varies between an interval of 0.21-4.88 mSv y(-1) (average 1.19 mSv y(-1)) and 0.14-9.08 mSv y(-1) (average 1.29 mSv y(-1)) for the 2013-2014 and 2021 surveys, respectively.
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