German language article about how we need to clean the air. Mentions http://indoorco2map.com and says that classrooms and doctors' offices are the worst when it comes to CO2 content in the air.

https://www.wiwo.de/technologie/forschung/innenraumluft-dicke-luft-die-unbekannte-produktivitaetsbremse/100167056.html

#CleanAir #aireamos #NousAerons #IndoorAir #MaskUpButtercup