These documents were written by indoor air and building science experts and I was involved in editing and/or writing… https://news.engineering.utoronto.ca/air-filtration-and-covid-19-indoor-air-quality-expert-explains-how-to-keep-you-and-your-building-safe/ https://www.ashrae.org/file%20library/about/position%20documents/airborne-infectious-diseases.pdf 
https://www.rehva.eu/activities/covid-19-guidance