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Pet Allergies & Dander

Certified CADR picks for cat and dog allergen, with the ionizer status of every unit stated up front.

• The Best Air Purifiers for PetsRoundup
• The Best Air Purifiers for Cat AllergiesRoundup
• The Best Air Purifiers for Dog AllergiesRoundup
• LEVOIT Core 400S vs Coway Airmega Mighty AP-1512HHHead to head
• Winix 5500-2 vs LEVOIT: the comparison the spec sheets settleHead to head
• Do air purifiers help with pet allergies?Evidence guide
• Do HEPA filters remove pet dander?Evidence guide
• Air purifiers for asthma in a pet householdEvidence guide
• Coway Airmega 400 vs Airmega Mighty AP-1512HHHead to head
• Are Dyson Air Purifiers Worth It for Pet Allergies?Explainer
• LEVOIT Core 400S ReviewGuide
• Coway Airmega 400 ReviewGuide
• The Best Air Purifiers for a Multi-Pet HouseholdRoundup
• Coway Airmega 400S vs Airmega 400Explainer
• The Best Air Purifiers for a Home With PetsRoundup
• Do air purifiers help cats with asthma?Evidence guide

Pet Hair, Dust & Odor

Hair, dust and odor are three jobs. Which machines do each one, and why cheap units never touch the smell.

• The Best Air Purifiers for Pet HairRoundup
• The Best Air Purifiers for DustRoundup
• The Best Air Purifiers for Pet OdorRoundup
• Air Purifiers With Washable Pre-FiltersRoundup
• Using an air purifier for a cat litter boxPractical guide
• Do air purifiers help with pet hair?Evidence guide
• Activated carbon and pet odorExplainer
• Winix C710 vs Coway Airmega Mighty AP-1512HHHead to head
• Blueair vs WinixHead to head
• Coway Airmega Mighty AP-1512HH ReviewGuide
• The Best Air Purifiers for Small PetsRoundup
• Winix vs CowayHead to head
• Blueair DustMagnet 5440i ReviewGuide
• Winix 5500-2 vs 5510Head to head
• Winix C610 ReviewGuide
• Coway Airmega Mighty2 vs Airmega Mighty AP-1512HHHead to head

Allergies, Dust, Mold & Asthma

The flagship allergy roundup, the ozone and ionizer safety pages, and what particle size actually means.

• The Best Air Purifiers for AllergiesRoundup
• The Best Air Purifiers for Mold SporesRoundup
• HEPA vs ionizers vs ozone generatorsExplainer
• Air purifier vs ozone generatorExplainer
• Waking up with allergy symptoms every morningPractical guide
• Do air purifiers help with asthma?Evidence guide
• Allergen particle sizes, explainedExplainer
• The Best Air Purifiers for Dust Mite AllergyRoundup
• The Best Air Purifiers for PollenRoundup
• The Best Air Purifiers for SmokeRoundup
• The Best Air Purifiers for HomeRoundup
• Medify MA-40 ReviewGuide
• Alen BreatheSmart 75i ReviewGuide
• The Best Air Purifiers for Cigarette SmokeRoundup
• The Best Air Purifiers for VOCs and FormaldehydeRoundup
• Honeywell InSight HPA4300 ReviewGuide
• Honeywell HPA6000 ReviewGuide
• Do UV air purifiers work?Explainer
• Are AirDoctor air purifiers worth it?Explainer
• Are IQAir air purifiers worth it?Explainer

Room Size, Bedroom & Placement

The calculator, the AHAM two-thirds rule, and certified picks for bedrooms, large rooms, small rooms and apartments.

• Air purifier size calculatorTool
• The Best Air Purifiers for a BedroomRoundup
• The Best Air Purifiers for Large RoomsRoundup
• The Best Air Purifiers for Small RoomsRoundup
• The Best Air Purifiers for ApartmentsRoundup
• Where to place an air purifierPractical guide
• Air purifier noise and sleeping through itPractical guide
• LEVOIT Core 400S vs Core 600SHead to head
• The Best Air Purifiers for a NurseryRoundup
• The Best Air Purifiers for a BasementRoundup
• The Best Air Purifiers for a Living RoomRoundup
• Blueair Blue Pure 211i Max ReviewGuide
• Blueair 211i Max vs 311i MaxHead to head
• The Best Air Purifiers for 1,000 Square FeetRoundup
• Coway Airmega 400 vs Airmega 450Head to head
• LEVOIT Core 600S ReviewGuide
• How many air purifiers do I need?Practical guide
• Blueair Blue Pure 311i Max ReviewGuide
• Coway Airmega 450 ReviewGuide
• Coway Airmega ProX ReviewGuide
• The Best Air Purifiers for a Dorm RoomRoundup
• How long does an air purifier take to clean a room?Explainer

CADR, Filters & Cost to Run

The cornerstone explainer, the certified CADR comparison chart, and the running-cost arithmetic with its working shown.

• What CADR actually meansExplainer
• CADR comparison chartExplainer
• LEVOIT vs CowayHead to head
• Air purifier vs humidifierExplainer
• True HEPA vs HEPA-TypeExplainer
• What air purifier filters actually costCost guide
• What an air purifier costs to runCost guide
• Air Purifier vs DehumidifierExplainer
• Blueair vs LEVOITHead to head
• How to Choose an Air PurifierPractical guide
• The Best HEPA Air PurifiersRoundup
• The Best Air Purifiers Under $200Roundup
• Coway Airmega 400 vs Blueair Blue Pure 211i MaxHead to head
• LEVOIT vs WinixHead to head
• Are air purifiers worth it?Practical guide
• The Best Air Purifiers Under $300Roundup
• Coway Airmega 400 vs LEVOIT Core 600SHead to head
• Honeywell vs LEVOITHead to head
• Honeywell vs CowayHead to head
• Blueair vs CowayHead to head
• GermGuardian AC4825 ReviewGuide
• Do houseplants clean the air?Explainer
• Air purifier vs furnace filterExplainer
• Do you need an air purifier with an air quality sensor?Practical guide
• Air purifier vs diffuserExplainer
• Honeywell vs BlueairHead to head

Trust and utility

• About Dander DownWho writes this, what we do instead of testing, and how it is funded.
• How We PickThe selection method in full, including where it runs out.
• Editorial PolicyCorrections, review cadence, and why commission never moves a ranking.
• Affiliate DisclosureHow this site makes money, in plain English.
• Air Purifier FAQTwenty questions people actually ask before buying, answered from the registers.
• ContactReport an error, ask a question, or tell us a spec has changed.
• SitemapEvery page on this site, grouped by section.
• Privacy PolicyWhat this site collects and what it does not.
• Terms of ServiceThe terms that apply to using this site.

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