A teacher friend maintains a CO2 reading in the low-500s in a classroom full of primary school children,…

A teacher friend maintains a CO2 reading in the low-500s in a classroom full of primary school children, using open windows. Also bought 2 HEPA filters out of their own money. 4 years of teaching like that, never infected. /1

This was so simple, and relatively inexpensive. Disgust that this wasn’t mandated as a minimum for all classrooms. And watching self-promoting experts with no knowledge of schools or ventilation, actively discouraging basics like this, creates white-hot anger. /2

Ask people who work in schools, the total disrespect that this hasn’t been done until now. Governments do ridiculous desktop audits of ventilation, from central HQ, but then do nothing to enforce even the basics like opening windows. /3

Ask kids and teachers how many of those windows are closed, even in warmer months. Lots. But then many schools used unflued gas heaters for years with no ventilation requirements either. Nobody with authority gives a shit. /end