Theory is that air systems in schools, restaurants, public places can spread the virus. Someone has already made filters and also something like a light scan you go through.
I love how protesters get a pass in the media, about not being selfish as they wear masks. But, they don’t maintain that 6 ft social distancing that we are mandated to do. Shoulder to shoulder, screaming in peoples faces through their mask not an inch from that person. Oh and you are to watch “not to scream, talk loudly” to help not spread COVID as well.
...filters and also something like a light scan you go through.
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About $100 on Amazon for a filter w/optional UV-C for 200 square feet. 55 watts + 5 watts for the light. I can see less smoke residue on surfaces, which I clean regularly, anyway.
As a smoker, I use one in my office. Occasionally, when windows are otherwise closed for weather reasons, I use ozone in the office and the filter out in the living room, if I am smoking there. Exhaust fans when necessary. Windows open if possible.
This is easily done, obvious and common sense. But it doesn’t inculcate fear or activate peer pressure, so it is ignored.