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Best Air Purifier With No Ozone and No Ionizer

Bottom line

The best no-ozone, no-ionizer air purifier is a sealed or true-HEPA unit that cleans purely mechanically, with verified CADR and low running cost.

If you'd rather not have anything in the room emitting ozone, the cleanest setup is pure mechanical filtration - the fan pulls air through the filter, and that's it: no ionizer, no plasma, no ozone byproduct. We rank units with no ozone-generating technology of any kind by overall score.

How we score: We include only units with no ozone-generating technology at all - meaning no ionizer of any kind - then rank them by overall score.

  1. 17.1
    Levoit Core 300S

    The Levoit Core 300S is a medium-room air purifier built around a H13 filter. Its Clean Air Delivery Rate is AHAM-verified at 175 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $45 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~271 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $45/yr
  2. 27.1
    Levoit Core 400S

    The Levoit Core 400S is a large-room air purifier built around a H13 filter. Its Clean Air Delivery Rate is AHAM-verified at 259 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $75 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~401 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $75/yr
  3. 37.1
    Levoit Vital 200S

    The Levoit Vital 200S is a medium-room air purifier built around a True HEPA filter. Its Clean Air Delivery Rate is AHAM-verified at 289 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $50 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~448 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $50/yr
  4. 46.9
    GermGuardian AC4825E

    The GermGuardian AC4825E is a large-room air purifier built around a True HEPA filter. Its Clean Air Delivery Rate is AHAM-verified at 125 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $25 per year, among the cheapest to run in our set.

    • Real coverage at 4.8 ACH: ~194 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $25/yr
  5. 55.0
    Honeywell HPA300

    The Honeywell HPA300 is a large-room air purifier built around a True HEPA filter. Its Clean Air Delivery Rate is AHAM-verified at 320 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $154 per year, on the expensive end to run.

    • Real coverage at 4.8 ACH: ~496 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $154/yr
  6. 64.9
    Medify MA-25

    The Medify MA-25 is a medium-room air purifier built around a H13 filter. Its Clean Air Delivery Rate is AHAM-verified at 123 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $150 per year, on the expensive end to run.

    • Real coverage at 4.8 ACH: ~191 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $150/yr
  7. 74.7
    Austin Air HealthMate HM400

    The Austin Air HealthMate HM400 is a large-room air purifier built around a True HEPA filter. Its performance is not published as an AHAM-verified CADR, and it uses no ionizer and no ozone-generating stage. Filters run about $44 per year, a typical running cost.

    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $44/yr
  8. 84.3
    Dyson Purifier Big+Quiet Formaldehyde (BP03)

    The Dyson Purifier Big+Quiet Formaldehyde (BP03) is a whole-house air purifier built around a H13 sealed-system filter. Its 200 cfm CADR is a manufacturer figure, not AHAM-verified, and it uses no ionizer and no ozone-generating stage. Filters run about $79 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~310 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $79/yr
  9. 94.2
    Dyson Purifier Cool TP07

    The Dyson Purifier Cool TP07 is a small-room air purifier built around a H13 sealed-system filter. Its 94 cfm CADR is a manufacturer figure, not AHAM-verified, and it uses no ionizer and no ozone-generating stage. Filters run about $80 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~146 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $80/yr
  10. 104.0
    Coway Airmega 400

    The Coway Airmega 400 is a whole-house air purifier built around a True HEPA filter. Its Clean Air Delivery Rate is AHAM-verified at 400 cfm, and it uses no ionizer and no ozone-generating stage. Filters run about $129 per year, on the expensive end to run.

    • Real coverage at 4.8 ACH: ~620 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $129/yr
  11. 113.9
    Alen BreatheSmart Flex

    The Alen BreatheSmart Flex is a large-room air purifier built around a H13 filter. Its 230 cfm CADR is a manufacturer figure, not AHAM-verified, and it uses no ionizer and no ozone-generating stage. Filters run about $89 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~357 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $89/yr
  12. 123.6
    IQAir HealthPro Plus

    The IQAir HealthPro Plus is a large-room air purifier built around a H13 sealed-system filter. Its performance is not published as an AHAM-verified CADR, and it uses no ionizer and no ozone-generating stage. Filters run about $195 per year, on the expensive end to run.

    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $195/yr
  13. 133.3
    Shark Air Purifier 6 (HE601)

    The Shark Air Purifier 6 (HE601) is a whole-house air purifier built around a True HEPA filter. Its 175 cfm CADR is a manufacturer figure, not AHAM-verified, and it uses no ionizer and no ozone-generating stage. Filters run about $90 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~271 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $90/yr
  14. 142.4
    Molekule Air Pro

    The Molekule Air Pro is a whole-house air purifier built around a True HEPA filter. Its performance is not published as an AHAM-verified CADR, and it uses no ionizer and no ozone-generating stage. Filters run about $350 per year, on the expensive end to run.

    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $350/yr
  15. 152.1
    MOOKA Air Purifier B-D02L

    The MOOKA Air Purifier B-D02L is a medium-room air purifier built around a H13 filter. Its 135 cfm CADR is a manufacturer figure, not AHAM-verified, and it uses no ionizer and no ozone-generating stage. Filters run about $60 per year, a typical running cost.

    • Real coverage at 4.8 ACH: ~209 sq ft
    • Ozone / ionizer: no ionizer and no ozone-generating stage
    • Annual filter cost: $60/yr

FAQ

Are ionizers dangerous?
Some emit ozone as a byproduct, which can irritate airways - that's the concern. If you already own one, you can usually switch the ionizer off and run the unit as a plain HEPA filter. And if you're buying fresh, a unit with no ionizer at all sidesteps the question entirely.

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