1/ Would have changed the title to "The Ionizer in Your School Likely Does Little to Fight Covid, Consumes Precious Resources that Could Have Been Used to Effectively Reduce Inhalation Dose, & May be Stoking a False Sense of Security that Puts School Occupants at Greater Risk." https://twitter.com/marwa_zaatari/status/1375459757880926211

2/ "Manufacturers say the devices remove 99 percent of viruses."

Here I go again .......

3/ I can easily design experiments to show that an old pair of socks removes 99% of viruses from air. Experiments should be designed to allow a translation to real-world building conditions. Otherwise we end up with an expensive pair of old socks in the middle of a room.