Air Purifiers
Find the right air purifier, sized by real coverage
Marketing coverage claims assume one air change per hour — a third of what allergists recommend. We score every purifier on verified CADR, sleep-mode noise and smart features, then size it to your actual room.
The air purifier aisle is a masterclass in optimistic math: "covers 2,250 sq ft" on a machine AHAM rates for 465. We track the models actually worth buying on Amazon — from the $99 Core 300 to HEPASilent flagships — and score each on the three things that decide daily satisfaction: how much clean air it really delivers, how quietly it runs at night, and whether it manages itself.
Top picks right now
CADR is the only number that matters
Clean Air Delivery Rate (CADR) is the independently verified cubic-feet-per-minute of clean air a purifier produces. Room-size claims derive from it — optimistically. We rank on smoke CADR (the hardest test) and convert marketing coverage back to honest AHAM figures, so a $160 Coway can beat a $500 tower where it deserves to.
The noise floor decides where it can live
Purifiers work by running constantly — so the sleep-mode decibel figure matters more than the max. Below 24 dB a machine disappears; at 40 dB it gets switched off, and a switched-off purifier has a CADR of zero. Our quiet scores use the minimum-speed floor, not the brochure average.
Auto mode is the feature that does the work
A particle sensor plus auto mode means the purifier ramps up when cooking smoke or pollen spikes and idles quietly otherwise — no app-checking required. We score smart features by what they automate, not by how many icons the app has.
Rankings by need
Buying guides
Compared head-to-head
- Levoit Core 400S vs Winix 9800: Which Air Purifier Should You Actually Buy?
- Blueair Blue Pure 211i Max vs Levoit Core 400S: Do You Actually Need 400 CADR?
- Dyson Purifier Cool TP07 vs Blueair Blue Pure 211i Max: Is the Dyson Worth $180 More?
- Levoit Core 300S vs Blueair Blue Pure 411i Max: which one belongs in your bedroom?
- Coway AP-1512HH Mighty vs Winix 5500-2: Which Air Purifier Is Right for Your Room?
- Levoit Core 400S vs Vital 200S: Is the Quieter One Worth $30 More?
- Honeywell HPA300 vs Winix 9800: what does the extra $50 actually buy?
- Dyson Purifier Cool TP07 vs Purifier Cool Gen1 TP10: Is the Connected Model Worth $150 More?
- Levoit Core 300 vs Core 300S: Is the App and Auto Mode Worth $50?
- Medify MA-40 vs Coway AP-1512HH Mighty: is the extra $120 buying cleaner air?