The effects of ions and naturally occurring EM fields is interesting but may be of limited usefulness given the unreliability of nature, and lack of ability to create the effect on demand.
There are devices which ionize or deionize air though I'm unaware of whether they generate the concentration required for measurable psychological effect.
The science of electromagnetic mind manipulation has advanced very much further than mild shifts in mood, largely in secret.
On the consumer end we have trans-cranial-stimulation:
https://en.wikipedia.org/wiki/Transcranial_magnetic_stimulation
Magnetic Field Prevents Editor from Talking
https://medicalxpress.com/news/2011-04-magnetic-fields-editor-video.html
On the military end we have:
MEDUSA - Mob Excess Deterrent Using Silent Audio.
https://en.wikipedia.org/wiki/MEDUSA_%28weapon%29
The microwave auditory effect:
https://en.wikipedia.org/wiki/Microwave_auditory_effect
https://www.wired.com/2008/07/the-microwave-s/
US Army's voice to skull (pic related):
https://www.wired.com/2008/05/army-removes-pa/
Along the same range of the EM spectrum we have the Heat Wave Crowd Control Cannon:
https://www.youtube.com/watch?v=tvZCz_3Fqog
Which uses targeted beam weaponry as in MEDUSA.
Though I am unwilling to expose hard evidence at this time (as it is part of my insurance files), I can vouch that The US government has far more uses for covert brain microwave beams. Mild microwave induced brain damage can yield a temporary or permanent state similar to schizophrenia and/or tourettes syndrome. In some jails today covert microwave of prisoners' brains is performed to convince them they are crazy and get them on psych meds (why not cause the insanity, then diagnose it), especially if the subject has seen something they shouldn't have. Often, false-prisoners are used to position the target in the path of the EM fields. Microwave of the upper spinal column can produce temporary or permanent physical twitches to go along with the tourettes-like mental ticks/outbursts.
This EM field / focused beam technology can be tuned to induce corresponding brain wave patterns to produce various emotional states, such as: Fear, Anxiety, Paranoia, Aggravation, Confusion, Drowsiness, Insomnia, and etc. base emotional responses. These devices can be smaller portable or large fixed installations. Portable models range in size from about 12x12x24 inches (w/o power source) to larger car, van, or tractor-trailer mounted systems. The EM field generators can be battery operated or ran via 120v or 240v AC line. These systems are often deployed as part of their crowd control or targeted "extremist" response force. There are even some deployed in court rooms, and pre-trial waiting rooms; the latter usually tuned to induce drowsiness.
The claims of the existence of "Mind Control Rays" are popular among conspiracy theorists, as they are often targeted by these very systems. Most times lower tech AM/FM radio, WIFI, shortwave and/or cellular jammers and signal hijackers are deployed to spurn paranoia prior to mind influencing devices. Note that this is a surefire way to tip off anyone who can triangulate jamming signals as to the location of the source of their attack... "counter intelligence" indeed, more like "anti-intelligent", heh.
Agency policy is to NOT deploy such secret mind influencing weaponry against targets which are sufficiently technologically capable that they could gather evidence of their existence and use. (un)Fortunately, their widespread usage has caused such systems to be unknowingly deployed against targets with underestimated capabilities (such as self-taught electrical engineers who have been tinkering with radios since they could walk) -- even though said targets often advertised their capabilities openly. Those tasked with deploying said systems are no longer highly skilled operatives, but are lower rank and largely unskilled with technology in general, thus prone to make such mistakes.
Once you have samples of the EM field signatures, it's only moderately difficult to reproduce them and their effects. So, it would be a safe bet that other countries have the same technology already.
Given the above linked devices, it's not hard to imagine that the government has developed even more advanced technology in secret. It's only a matter of time before such things become public knowledge whether or not I publish my results.
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