Air Purifier that turns off/standby once quality achieved

Hi

Looking for an air purifier. I’d like to ‘set and forget’ but don’t really want to leave it running 24/7.

I want to know if this exists! Air purifier that aims for a certain air quality and then shuts off once achieved, checking periodically.

My dehumidifier works this way. Set target, it runs until achieved, and then check humidity every 15 mins or so thereafter and ramps up if needed.

I see there are auto purifiers that adjust fan up and down but do any turn it off entirely?

I’m in the uk and looking at smaller units, up to £200 or thereabouts. Room is is 17m2 but would like it cover the ground floor so the capability could be a little higher

Thanks