ASN Report 2022

in the care facilities for children under 6 years of age, 86% of the healthcare, social and medico-social facilities, in 50% of the spas and 89% of the penitentiaries. If the reference level is exceeded, the facility concerned is obliged to carry out corrective action or works, then check the effectiveness through a new measurement. The analysis of the results over the last six years shows improved effectiveness of these corrective actions and works, with a regular reduction in the measured values exceeding the reference level of 1,000 Bq/m3 and a recent downward trend in the measured values exceeding the reference level of 300 Bq/m3. Thus, during the last campaign from 2021‑2022(12), more than half of the facilities managed to return to a level below the reference level of 300 Bq/m3 (see Diagram 4). Additional measurements are performed to identify radon sources, entry and transfer pathways in the buildings, which are carried out to support the expert assessment, particularly for building covering a large ground surface area with complex substructures. They correspond to level 2 of the approvals. Between 60 and 100 additional measurements were thus carried over the last three campaigns. For the last six measuring campaigns, the categories of establishments measured are broken down as follows: 59% educational institutions (from nursery school to secondary high school), 29% healthcare, social and medico-social institutions, 11% care facilities for children under 6 years of age (new category introduced in 2018) and less than 1% spas and penitentiaries (see Diagram 5). More generally, the management strategy for the radon risk is set out in a national action plan. Implementation of this plan will improve the way the general public and the stakeholders concerned are informed and will enhance knowledge of radon exposure in the home and how it evolves. The fourth French national plan for the 2020-2024 period was published in early 2021. It fits into the framework of the fourth National Health and Environment Plan which now coordinates all the sector-based plans concerning health or the environment, which is itself driven by the National Public Health Strategy 20182022, of which one action aims to reduce exposure to interior pollution. This action explicitly targets the effects of radon in the home: “over and beyond the sanitary aspects, it is question of promoting a living environment that fosters health and of reducing the effects of exposure in the home (chemical pollution, radon, etc.)”. This plan follows on from the preceding plans (the assessment of the third plan is available on It can be broken down into 13 actions focusing on three lines. Line 1 aims to implement an information and awarenessraising strategy. The health issue that radon represents requires continuation of the awareness-raising and information measures directed towards all the players (regional authorities, employers, building professionals, health professionals, teachers, etc.) and the general public, both nationally and locally, with the promotion and accompanying of regional measures for the integrated management of the radon risk in the home. A specific communication campaign shall target smokers, because they constitute the population the most at risk of developing lung cancer linked to cumulative exposure to radon and tobacco. The operational implementation of the information system incorporating all the radon monitoring results, as well as the consolidation and centralising of the existing measures, would appear moreover to be essential for informing the public. 12. Order of 26 February 2019 relative to the methods of managing radon in certain buildings open to the public and dissemination of information to the people frequenting these buildings. Line 2 aims to continue to improve knowledge. The publication in 2018 of a new map on the municipal scale, based on three radon-potential zones, enabled a graded approach to radon risk management to be implemented. This map must nevertheless be improved so as to better integrate certain geological factors that could facilitate radon transfer to buildings (karst zones in particular). Furthermore, the fourth Radon Plan provides for the updating of knowledge of exposure of the French population by organising the collection of measurement data obtained in particular during the local awareness-raising operations organised by the ARS and the regional authorities to cover the areas for which insufficient data are available. These operations consist DIAGRAM Results of the initial and ten-yearly measurements in public access buildings 3 0% 20% 40% 60% 80% 100% 2021-2022 2020-2021 2019-2020 2018-2019 2017-2018 2016-2017 Results < 300 Bq/m3 Results 300 à 1,000 Bq/m3 Results > 1,000 Bq/m3 DIAGRAM Measurements after corrective actions and works 4 0% 20% 40% 60% 80% 100% 2021-2022 2020-2021 2019-2020 2018-2019 2017-2018 2016-2017 Results < 300 Bq/m3 Results 300 à 1,000 Bq/m3 Results > 1,000 Bq/m3 ASN Report on the state of nuclear safety and radiation protection in France in 2022 113 • 01 • Nuclear activities: ionising radiation and health and environmental risks 07 08 13 AP 04 10 06 12 14 03 09 05 11 02 01