An ionizer does not produce O3 (molecular ozone), not even close. What exactly was in the room (brand, model, etc.)?
Some models of negative ion fountains aka negative ion generators can produce small amounts of O3 (ozone) as a
by product. not all of them, but some can, Generally, these products produce far less than the .0.05 mg/hr FDA recommendation for safe exposure limit. I believe that OSHA requires that workers not be exposed to more than 0.10 /mg or ppm per eight hours, something along those lines if memory serves me correct.
It's rare a plant gets seriously ill from simple exposure to a ionizer like you described , sounds like the plant stressed during the move and the ionizer is taking the rap
, now an ozone generator is another matter, to close to plants or very high doses and it's very possible you'll get necrosis in no time at all, hell you can get pretty ill from too much exposure to ozone. If it can ill mold, dust mites and remove virtually all organic smells and many chemical ones too. I think they outlawed them in parts of Canada, maybe all of
Canada.
Some people are very ozone sensitive, others can tolerate it with no problem, the person I bought it from on Ebay was VERY sensitive, it was turned on once or twice, then sold on Ebay. I got a good deal, the MSRP is $599, paid $40 plus shipping. didn't even have a spec of dust on the fan or anywhere else.
Lots of people got duped by ozone generator manufacturers and a
'bit off false' advertising, mine puts out something like 500-800 mg/hour. A little bit more than the EPA recommendation of .05mg/hr
I use it sparingly and as little as possible. I generally have it on a timer when not home, on for a few minutes, then off, if not venting, the o3 dissipates in something like 30min to an hour depending on the a/c on and other factors, always off when I'm near it. If I'm home I plug it into a appliance remote outlet, then when I want it on, I hit the remote control and then off when I can smell it from the other room, (bleachy smell) then I shut it off (Usually just a couple minutes after its been turned on.) When buying a ozone generator, you really need to understand it, and understand how to use it safely.
Enough ozone talk, I'm glad your baby sprung back to life, good endings are always nice to hear, rather than having a funeral for your prized plant.