Question 1

Which is better, Dyson Purifier Big Quiet Formaldehyde or Levoit Core 400S?

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 Levoit Core 400S?

Accepted Answer

The Dyson Purifier Big Quiet Formaldehyde scores 8.5/10 while the Levoit Core 400S 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 Levoit Core 400S: Which to Buy?