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HereвЂ™s some of the theory: People infected with the SARS-CoV-2 virus make more virus. вЂњIf it wasnвЂ™t for the fact that, you know, weвЂ™re still on lockdown, this would be a great fourth-year team project.вЂќ

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I donвЂ™t have a lot of free time, but this would be something to build a prototype of,вЂќ Corsi says. вЂњYouвЂ™ve got me really pumped up on this right now. On a recent Zoom call, environmental engineer Richard Corsi-dean of the Maseeh College of Engineering and Computer Science at Portland State University and an indoor air quality expert-held up a Folgers Coffee box to illustrate for me how a fan at one end, and filters on three or four other sides, could reduce the вЂњpressure dropвЂќ that can come from putting a filter in front of a fan and still move (and clean) room-sized volumes of air. вЂњIt hadnвЂ™t occurred to me until two days ago, until someone pointed it out,вЂќ says JosГ©-Luis JimГ©nez, an aerosol scientist at the University of Colorado, Boulder, вЂњbut I think itвЂ™s a brilliant idea.вЂќ

ItвЂ™s cheap, and while it wouldnвЂ™t cut the risk of infection to zero, it would still pull virus-laden particles out of the air.

But itвЂ™s possible, some of them speculate, that even a store-bought filter stuck onto a $20 box fan might do some good too. A $500 air purifier could make a real difference in pulling infectious bits out of a room before they can infect a person. A big, complicated central air system filled with filters and maybe even germ-busting ultraviolet light, like what a hospital or skyscraper might have, would be great. And now some of those same aerosol specialists have begun to think this ventilation approach is a good idea. Researchers who study aerosols and indoor air quality have (mostly) (finally) convinced the scientific establishment-the World Health Organization, the US Department of Health and Human Services-that Covid-19 transmission has an airborne component. But what if-and I am literally spitballing here-you could clean those particles from the air itself? The virus that causes the pandemic disease Covid-19 passes from human to human on tiny droplets of spittle, through the air. The idea seems pretty simple, once someone explains it.