Use a CO2 monitor during busy crowded times in public indoor spaces to check ventilation. Fix it to target 600 ppm or less, and you SHOULD eliminate COVID-19 aerosol transmission. The evidence in a thread. 1/

An indoor air quality expert uses calculations on air and science on threshold rebreathed fraction to calculate 650 ppm as the transmission threshold under reasonable assumptoms. 2/ https://twitter.com/CorsIAQ/status/1315550910194438146?s=20

A Taiwan study finds 600 ppm is good enough to halt TB transmission. 3/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7217216/

If we ventilate enough, the concentration of virus, assuming someone infectious is present, will drop enough that a little social distancing will BLOCK aerosol transmssion. If we pervasively check ventilation in public, indoor, spaces, we can CRUSH COVID-19. 4/4