Sounds like "air ionizers":<p><a href="https://en.wikipedia.org/wiki/Air_ioniser#Ions_versus_ozone" rel="nofollow">https://en.wikipedia.org/wiki/Air_ioniser#Ions_versus_ozone</a><p>see also "Ions versus ozone" (part of the same article):<p><a href="https://en.wikipedia.org/wiki/Air_ioniser#Ions_versus_ozone" rel="nofollow">https://en.wikipedia.org/wiki/Air_ioniser#Ions_versus_ozone</a><p>I'm fairly certain any plasma is harder to create than ionized air and the plasma could be maintained only in a relatively small confined space, whereas ions can be freely distributed into a room.<p>Air ionizers are one option used for cleaning up black mold, fungus, etc. when a building suffers water damage. They're sometimes used to "mop up" after the usual methods of cleaning (washing with anti-fungals, antiseptics, etc.) have been exhausted.<p>Turn on the ionizer, keep the air circulating, and periodically measure cooties (fungus, bacteria, germs, viruses, etc.) until levels are below tolerance. You leave the premises if using an ozone generator but some models claim to limit ionization to the unit itself, in which case you should be able to live on the premises.
Any released ionized particles travel to the remotest parts of the air circulation system for mop-up.<p>Its old tech that has existed almost since the first spark coil.