Testing out my new #Aranet4 on the train today - not bad!
I bought it to keep an eye on the c02 levels in indoor public spaces so that I can make an informed decision about whether to wear a mask, open a window, or in an extreme case: encouraging a venue to install better ventilation (or something like a Corsi-Rosenthal box).
(I'm less interested in the c02 levels themselves and more interested in it as a proxy for risk of airborne respiratory infections such as #covid)
