Blueair
Blueair Blue Pure 211i Max
$349.99Cheaper
Released 2022
Best Air Purifiers · head-to-head
Blueair Blue Pure 211i Max vs Dyson Purifier Big+Quiet Formaldehyde BP04
A sourced, side-by-side comparison. Blueair Blue Pure 211i Max is cheaper at $349.99. Every spec and price links to its source.
Dyson
Dyson Purifier Big+Quiet Formaldehyde BP04
$1199.99
Released 2023
Which is better: the Blueair Blue Pure 211i Max or Dyson Purifier Big+Quiet Formaldehyde BP04?
On the specs we track, they're closely matched. The Blueair Blue Pure 211i Max is the cheaper at $349.99.
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Full spec sheet
✓ marks the stronger figure where "more" — or "less", for price and weight — is unambiguously better.
| Spec | Blueair Blue Pure 211i Max | Dyson Purifier Big+Quiet Formaldehyde BP04 |
|---|---|---|
| US price | $349.99 | $1199.99 |
| Brand | Blueair | Dyson |
| Released | 2022 | 2023 |
| Cadr smoke (CFM) | 443 | — |
| Coverage (sq ft) | 674 | — |
| Hepa | Yes | Yes |
| Filter type | HEPASilent dual filtration (mechanical + electrostatic) + Activated Carbon, 4-layer | 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter |
| Noise db min | 23 | — |
| Smart | Yes | Yes |
| Energy star | Yes | No |
| Release | 2022 | 2023 |
Sources — Blueair Blue Pure 211i Max: blueair.com (verified 2026-06-15). Dyson Purifier Big+Quiet Formaldehyde BP04: dyson.com (verified 2026-06-15).
What's the difference between the Blueair Blue Pure 211i Max and Dyson Purifier Big+Quiet Formaldehyde BP04?
Where the two actually differ on the specs we track (2 of 7). Matching specs are omitted.
- Filter type: Blueair Blue Pure 211i Max HEPASilent dual filtration (mechanical + electrostatic) + Activated Carbon, 4-layer vs Dyson Purifier Big+Quiet Formaldehyde BP04 360° HEPA H13 + K-Carbon filter + SCO (Selective Catalytic Oxidization) formaldehyde filter
- Energy star: Blueair Blue Pure 211i Max true vs Dyson Purifier Big+Quiet Formaldehyde BP04 false
What reviewers say
Sourced tester consensus for each — the "what people who used it think" layer, not just specs.
Blueair Blue Pure 211i Max
Only one whitelisted tester, Wirecutter, published hands-on measured results for this exact model, naming it their large-room upgrade pick. Wirecutter found it a stellar, quiet, energy-efficient large-room performer (>99.9% smoke reduction), with a durability caveat on the washable fabric cover. (1 sourced review, 1 lab-tested.)
Praised: Stellar large-room particle/smoke reduction (>99.9% in the 30-minute test); Very quiet for its power (<=41 dBA on its four lower speeds); Energy efficient (41 W max; 11-18 W in normal everyday use).
Flagged: Fabric cover looks shaggy over time and lost elasticity after a few washes, needing replacement; Shorter filter replacement cycle (6-9 months vs a typical year); Relatively high price and overkill for small-to-medium rooms.
Dyson Purifier Big+Quiet Formaldehyde BP04
Three whitelisted outlets (TechRadar, Reviewed/USA Today, TechHive) hands-on or lab tested the Dyson Purifier Big+Quiet Formaldehyde; TechRadar and Reviewed covered the higher CO2-sensor trim (aligned with BP04) while TechHive tested the base Formaldehyde unit. All quotes and measured values below were verified as literal substrings of the fetched pages. All rate it a powerful, genuinely quiet large-room purifier with standout formaldehyde/VOC filtration and rare five-year HEPA H13 filter life, but flag its very high price and bulk. Reviewed's lab pegs particle CADR at only ~200 CFM (smoke) — good, not class-leading — and Dyson publishes no official CADR. (3 sourced reviews, 3 lab-tested.)
Praised: Best-in-class formaldehyde/VOC chemical filtration; Powerful; cleans very large open-plan spaces; Acoustically quiet despite its power.
Flagged: Very expensive; costs a small fortune; Big, heavy and bulky (26 lbs, ~33 in tall); Produces a strong, physically noticeable airflow/wind nearby.