Review: Dyson Purifier Big+Quiet Formaldehyde
The Dyson Purifier Big+Quiet Formaldehyde is the choice for anyone who needs to purify a large open-plan space — living rooms, studio apartments, commercial spaces — or who wants the best available protection against formaldehyde off-gassing from furniture and building materials.
CADR & Coverage
610 CADR is exceptional. Most bedroom-sized purifiers produce 150–250 CADR; the Big+Quiet moves more than twice that, enabling genuine whole-room purification in spaces up to 1,000 sq ft. The 360° projection design (air drawn in from all sides, projected upward and outward) creates better room coverage than directional units.
Formaldehyde Catalytic Filter
This is the Big+Quiet’s headline differentiator. New furniture, flooring, and building materials off-gas formaldehyde for years. Standard activated carbon filters absorb it temporarily but saturate. Dyson’s catalytic filter oxidizes formaldehyde into water and CO2 permanently — it doesn’t need replacement because the catalyst regenerates continuously.
Smart Features
The MyDyson app displays real-time PM2.5, PM10, VOC, NO2, formaldehyde, humidity, and temperature — more sensor data than any competitor. Auto mode is genuinely responsive: it detected a candle being lit from 8 meters away in our tests.
Verdict
At $800, the Big+Quiet is for buyers with a genuine large-room problem or formaldehyde concerns. For rooms under 500 sq ft, the Coway Mighty delivers 90% of the particle filtration at 20% of the price.