#physics **Physics of air quality** I don't have much to say, but I'm thinking that the physics here is as bad as anything else. The story is all controlled by those who have skin in the game. They have 'qualifications' and the influencers parrot them. I'm thinking of uvc on titanium oxide. I've rigged this up a few times, and it gives a nice fresh scent like the outdoors. This gives out hydroxyl ions, and I'm thinking that someone should be bold enough to have a hypothesis that a heavy saturation of this in the air is harmless and stops covid from getting in the eyes. However, anything new is instantly sued in the US. Too bad. We'll just have to go with things that don't work.