Question 1

Which is better, Dyson Purifier Big Quiet Formaldehyde or Blueair Blue Pure 311i Max?

Accepted Answer

Both products scored 8.5/10 in our testing — it's a tie. Choose based on which features matter most to you.

Question 2

Is the Dyson Purifier Big Quiet Formaldehyde worth it over the Blueair Blue Pure 311i Max?

Accepted Answer

The Dyson Purifier Big Quiet Formaldehyde scores 8.5/10 while the Blueair Blue Pure 311i Max scores 8.5/10. The Dyson Purifier Big Quiet Formaldehyde is our "Best Overall" pick in the Best Air Purifiers for Allergies 2026 category.

Dyson Purifier Big Quiet Formaldehyde vs Blueair Blue Pure 311i Max: Which to Buy?