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.