Moved into new (to us, built in 1980) house 2 years ago. Installed an Airthings radon meter a year ago. Levels get up to 400 Bq/m3 when all the windows are closed. Finally had a radon mitigation system installed. Will hopefully get to much safer level below 100 Bq/m3.


Here is the official map for Germany: https://www.bfs.de/DE/themen/ion/umwelt/radon/karten/boden.html (Map can be understood without knowing any German)
Looks like it’s a considerably bigger problem in Canada compared to Germany.
https://evictradon.org/radon/radon-in-canada/
Looks like Poland is actually the worst in the world.
Oh wow. Interesting that it is measured this accurately anyway. Thanks for sharing!