“The results suggest that air filters could be used to reduce the risk of patients and medical staff contracting SARS-CoV-2 in hospitals, the study’s authors say.”
An inexpensive portable filter pulled the virus out of the air on a COVID ward. This is the first real-world evidence, a year and a half into the pandemic. The fix for an airborne virus is cleaner air. It took this long for anyone to measure it in a hospital.