I am experimenting with a hydroxyl generator. It is a powerful UV-A lamp on a titanium dioxide plate, with misters pouring water vapour over it.
Such a mess, but that's me. I had to put two Chinese dollar misters to make a noticable difference. Sometimes, the fresh air sweeps over me, but it depends on how much mist is hitting the plate.
This produces hydroxyl, which is OH-. That cleans the air in nature, with the sunlight on objects. You get a good jolt when it is raining. This would solve all our underground stale air problems. You can feel when the hydroxyl content is high, and that means the air is clean. The negative ions latch onto all the gunk (aromatics) in the air.
The bubble is only about 8 feet, off and on. You would need much more powerful machines, and you can't transfer this through metal vents. Air exchange is great, but in the winter you lose heat. If you use an air heat exchanger, you lose the ions. All cruise ships should have this everywhere.
Some ion generators use high voltage and sharp pins, but I find they clog up right away. Take notice the next time you sniff fresh air.
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