For a bedroom, the Levoit Core Mini clears allergens up to 34m² and runs quiet at night; size up to the Levoit 80m² for open-plan, or Dyson Hushjet for pets.

Indoor air holds more pollen, dust and pet dander than most people expect, and in a flat with the windows shut it has nowhere to go. A purifier's one job is to pull that air through a filter often enough to make a real difference in the room where you actually spend your time.

We weighed each purifier against four things that decide whether it helps — the filtration, the room coverage, the footprint, and who each one genuinely suits. The Levoit Core Mini wins as the do-everything pick for a bedroom because its three-stage HEPA filter handles allergens and pollen in rooms up to 34m², from a body small enough for a bedside table, and it runs quietly at night.

The alternatives exist because homes differ. An open-plan living and dining area needs the coverage of the larger Levoit, rated for 80m². A home with pets or severe allergies is better served by the Dyson Hushjet, whose fully-sealed H13 filtration and five-year filter aim at the hardest cases with the least upkeep.

Every assessment here is a synthesis of documented specifications and general use, not a hands-on air-quality test — you can read exactly what that means on our how-we-test page. Whichever you choose, size it to your room first; a purifier that is too small for the space never keeps up.