If you don't have HVAC, a cool, cheap filtration system can be fabricated from 4 - 20" paper filters and a 20" box fan plus some duct tape.
Take the fan out of it's box. Cut out a 20" square from the side of the box. This will be the base of your filtration system. Next, tape one 20" edge of a filter panel to the outside edge of the base. Repeat 3 more times with the remaining edges and filters creating a "box". Tape the edges of the filters together to form air tight corners. Lastly, tape the 20" box fan to the top of the 4 filter edges forming an enclosed cube. Make sure the fan direction is sucking air out of the cube and blowing it towards the ceiling. You now have a powerful standalone 360° filtration unit.
You can use hepafilter panels, charcoal assisted panels or the cheapest paper fiber filters as long as they are 20" on one side and have cardboard frames. A box fan is about $20, filters vary from $4 each and up. This cube will cost under $40 using cheap filter panels.
2" thick filters are a must too. I run this exact setup at my jobsites
I forgot to mention another important point that the older data is corrupted by "death with covid" numbers combined with "death by covid" numbers using those unreliable covid tests. Don't trust the data. The common cold would cause a positive test result. Remember the African leader who tested a goat, a papaya, other nonhuman things and got positive test results?
If you don't have the space, you can also just tape a 20x20 single filter to the back of a box fan and run it on low. I've been doing this for years. It works.
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