For the application of articles L. 221-7 of the Environment Code and L. 1333-3 of this Code, the reference level for average annual radon activity is set at 300 Bq. m-3 in built-up buildings.
An order by the minister responsible for radiation protection, issued after consultation with the High Council for Public Health, specifies the health information and recommendations to be disseminated, by the authorities or bodies it designates, to people affected by radon risk.