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@Greenbank
This is PM1 (although PM2.5 and PM10 are the same) and there's no equivalent behaviour. It's pretty much correlated to whether someone is sat in the room at the time and drops whenever there isn't.
Based on the fact that it dropped down to near base levels even when there were two of us still in the flat I'd expect particulates are more localised and therefore you'd need to move any purifier around rather than just dumping it in one place.
But this is just based on CO2/PM1/PM2.5/PM10 results. Purifiers do other stuff too.
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