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@Greenbank
Not quite air purifiers but one thing I noticed from my CO2 monitors is that the level in my spare bedroom (which I use as an office) remains high even if no-one is in the room but people are asleep in the flat (it's all on one level and no room is more than 2 doors away from every other room).
The levels drop from a high of ~700ppm near midnight (16th 23:59:59) down to ~500ppm whilst we are all asleep (although there's a recalibration at around 4am where it drops 60ppm or so).
But you can clearly see when we went out at about 10am on the 17th (so no-one was left in the flat) and it quickly drops down to the outside base level. Then we come back just before 3pm and it jumps back up again even though no-one was in the spare bedroom.
(The upper trace is an internal sensor, the lower trace is an external sensor.)
I'll see what the particulate sensors measured during the same time frame...
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