air quality

[I think this belongs here - please move if necessary] A Fight About Viruses in the Air Is Finally Over. Now It’s Time for Healthy Venting https://www.scientificamerican.com/article/a-fight-about-viruses-in-the-air-is-finally-over-now-its-time-for-healthy/

Schools cut covid-19 sick days by 20 per cent using HEPA air filters https://www.newscientist.com/article/2398713-schools-cut-covid-19-sick-days-by-20-per-cent-using-hepa-air-filters/ (paywall, but first few sentences are visible)