The Xiaomi 4Pro air purifier — a change of clean air for the place you've just moved into.
When you'd use it: clearing the smell of a newly rented flat; windows shut and air clean through pollen season; quiet enough to run in the bedroom overnight.
What it does: filtering aimed at formaldehyde and PM2.5, whole-room circulation, and low-noise running.
Why it helps: the mustiness of an old British house and the sneezes of pollen season — the filter system deals with both at once.
