Multiple stand-alone filter units per classroom. With all the accompanying fire-code and electrical issues. When we can't get them to install even one or leave it turned on when they do.

Definitely, a realistic recommendation that is going to be implemented at scale anyplace…

Meanwhile, schools (anywhere on the planet) known for excess floorspace.

ELI5:
A lot of what I argue about/for with clean air boils down to cleaning with one of those Swiffer things, or a mop and bucket.

Swiffers are cheaper to buy than a good mop and bucket, arguably easier to use, and work very well- but the long-term cost of ownership,…