Reading these comments, and seeing that I live in a red area of Germany on this map https://www.fs-ev.org/fileadmin/user_upload/97_Service/Radonvorsorge/Radonka

Reading these comments, and seeing that I live in a red area of Germany on this map https://www.fs-ev.org/fileadmin/user_upload/97_Service/Radonvorsorge/Radonkarte-BfS.jpg https://www.fs-ev.org/fileadmin/user_upload/97_Service/Radon..., I'm sure glad that my apartment is on the first floor (and the bedroom on the second floor).