augieray, Monitoring for CO2 and air filtration can work to reduce #COVID19 risks.
STUDY: "There was a statistically significant correlation between the total time of room CO2 concentrations ≥1,000 and SARS-CoV-2 cases in an IDD school. Merv-13 filters appear to decrease the incidence of SARS-CoV-2 infection. "
https://journals.plos.org/plosone/article?id=10.1371/journal.pone.0291840