Question about Electrolux PA91-604GY

Apart from Electrolux, nobody knows for sure. In any case, you won't die from it ;-)
I have the fan on all day in summer and the windows closed (heat bäh!) and have no concerns about this.

Years ago, before I bought it, I asked Electrolux about this. I don't remember the exact size. In any case, it was relatively low and didn't put me off buying it. It also doesn't smell of ozone like other appliances. I only switch on the ionisation when PM levels are high. In my opinion, from a building biology point of view, there are no problems in theory or practice.