A new scientific paper makes an intuitive finding: using air filtration and UV sterilisation on air probably reduces the transmission of COVID-19, and has the incidental benefit of probably reducing the transmission of other stuff in the air too:
Airborne SARS-CoV-2 was detected in the ward on all five days before activation of air/UV filtration, but on none of the five days when the air/UV filter was operational; SARS-CoV-2 was again detected on four out of five days when the filter was off. Airborne SARS-CoV-2 was infrequently detected in the ICU. Filtration significantly reduced the burden of other microbial bioaerosols in both the ward (48 pathogens detected before filtration, two after, p=0.05) and the ICU (45 pathogens detected before filtration, five after p=0.05).The removal of airborne SARS-CoV-2 and other microbial bioaerosols by air filtration on COVID-19 surge units
Seems like this is something that our public buildings should look to do where possible.