Some internal air cleaner exist, including the ones with UV purification. My friend Denis Odinokov suggested to make a system to clean external air, which should consist of a tube with HEPA filter, ventilator and UV light source, which will create a positive air pressure inside the apartment. I think it is too difficult to hand-make at home. But it is another business opportunity of our time.
I agree that preventing exposure to virions is a priority, but I am concerned with indoor air quality overall, especially if people are staying indoors for long periods: https://en.m.wikipedia.org/wiki/Indoor_air_quality?wprov=sfla1
Some internal air cleaner exist, including the ones with UV purification. My friend Denis Odinokov suggested to make a system to clean external air, which should consist of a tube with HEPA filter, ventilator and UV light source, which will create a positive air pressure inside the apartment. I think it is too difficult to hand-make at home. But it is another business opportunity of our time.