Blueair Blue Pure 311i+ vs Dyson Purifier Big Quiet Formaldehyde
We compare the Blueair Blue Pure 311i+ and Dyson Purifier Big Quiet Formaldehyde head-to-head on performance, features, value, and more. Here's which one wins.
Blueair Blue Pure 311i+
Scored 8.9/10 in our testing
Blueair Blue Pure 311i+
Tech-savvy users who want app control and auto-adjusting purification
Dyson Purifier Big Quiet Formaldehyde
Design-conscious buyers who want the quietest large-room purifier with formaldehyde destruction
Score Breakdown
| Blueair Blue Pure 311i+ | Category | Dyson Purifier Big Quiet Formaldehyde |
|---|---|---|
| 8.8/10 | Performance | ✓ 9.3/10 |
| 9.3/10 | Features | ✓ 9.5/10 |
| 9/10 ✓ | Ease of Use | 8.8/10 |
| 8.5/10 ✓ | Value | 7/10 |
| 8.9/10 ✓ | Overall | 8.7/10 |
Specs Comparison
| Blueair Blue Pure 311i+ | Spec | Dyson Purifier Big Quiet Formaldehyde |
|---|---|---|
| Up to 929 sq ft | Coverage | Up to 1,076 sq ft |
| HEPASilent with activated carbon | Filtration | HEPA H13 + catalytic formaldehyde filter |
| Wi-Fi, app control, air quality sensor | Smart | As low as 15 dB |
| 23-53 dB | Noise | Dyson Link app, air quality display |
| 250 CFM | CADR | PM2.5, PM10, VOCs, NO2, formaldehyde |
Blueair Blue Pure 311i+
Pros
- + Full app control with air quality monitoring
- + HEPASilent technology is whisper-quiet
- + Auto mode responds quickly to changes
- + Attractive fabric pre-filter in multiple colors
Cons
- − Covers less area than Coway Airmega 400
- − Replacement filters are pricey
- − Wi-Fi setup can be finicky
Dyson Purifier Big Quiet Formaldehyde
Pros
- + Near-silent operation at 15 dB
- + Catalytic formaldehyde destruction
- + Comprehensive sensor array
- + Stunning industrial design
Cons
- − Very expensive
- − Large footprint
- − Dyson filter replacements are costly
Our Verdict
Based on our scoring, the Blueair Blue Pure 311i+ comes out on top with an overall score of 8.9/10. The Blue Pure 311i+ combines Blueair's proven HEPASilent filtration with genuine smart home integration. The app provides real-time air quality data, filter life tracking, and scheduling. Auto mode responds quickly to cooking odors and allergens. It's the best smart air purifier for medium-to-large rooms.
Buy the Blueair Blue Pure 311i+ on AmazonRead the full Best Air Purifiers for Large Rooms 2026 guide for complete reviews of all 5 products.