Obligatory Tom Scott video on indoor CO2 levels: https://www.youtube.com/watch?v=1Nh_vxpycEA https://www.youtube.com/watch?v=1Nh_vxpycEA (or the studies thems

Obligatory Tom Scott video on indoor CO2 levels: https://www.youtube.com/watch?v=1Nh_vxpycEA https://www.youtube.com/watch?v=1Nh_vxpycEA (or the studies themselves https://www.gwern.net/docs/co2/2015-stafford.pdf https://www.gwern.net/docs/co2/2015-stafford.pdf and others) I.e. I think air quality is likely a big factor. When it's windy and I get good airflow through my room it doesn't feel as different from outside. It's probably not only CO2, but also dust, VOCs, funghi, microorganisms, etc.