Independent testing
How much independent testing exists for each air purifier
Of the 22 air purifiers we track, 16 have been physically measured by at least one independent lab and 2 by three or more. Below is every one, ordered by how much independent hands-on evidence stands behind it — densest first.
A coverage record, not a ranking of which is best.
| Product | Independent labs | Metrics measured | Outlets on record |
|---|---|---|---|
| Molekule Air Pro | 3 | 12 | 3 |
| Dyson Purifier Big+Quiet Formaldehyde BP04 | 3 | 4 | 3 |
| Blueair Blue Signature Medium | 2 | 9 | 2 |
| Dyson HushJet Compact (HJ10) | 2 | 7 | 2 |
| Levoit Core 300S | 2 | 3 | 2 |
| Levoit Core 600S | 1 | 9 | 1 |
| Coway AP-1512HH Mighty | 1 | 7 | 1 |
| Levoit Vital 200S | 1 | 7 | 1 |
| Blueair Blue Pure 311i Max | 1 | 5 | 1 |
| Blueair Blue Pure 211i Max | 1 | 4 | 1 |
| Levoit EverestAir | 1 | 2 | 1 |
| Rabbit Air A3 | 1 | 2 | 2 |
| Rabbit Air BioGS 2.0 | 1 | 2 | 1 |
| Winix 5500-2 | 1 | 2 | 1 |
| Medify MA-40 | 1 | 1 | 1 |
| Shark NeverChange Air Purifier MAX (HP302) | 1 | 1 | 1 |
| Alen BreatheSmart 75i | 0 | 0 | 2 |
| Austin Air HealthMate HM400 | 0 | 0 | 1 |
| Coway Airmega 400S | 0 | 0 | 1 |
| Levoit Core 400S | 0 | 0 | 1 |
| Rabbit Air MinusA2 | 0 | 0 | 1 |
| Winix 5520 | 0 | 0 | 1 |
Each figure is a count of what independent testers actually did — how we count. A low count means little independent evidence has been gathered yet, never that a product is worse. See also the Air Purifiers buying guide and the reviewers we cite.