How does a HEPA air purifier work?
A HEPA air purifier pulls air through a dense mechanical filter that captures particles by interception, impaction, and diffusion. Nothing is charged or emitted, the particles are simply trapped and removed from the room. The AirPro pairs its HEPA 14 filter with a pre-filter, activated carbon for gases and odors, and fully enclosed UV-C.How does an ionizer (ionic) air purifier work?
An ionizer emits negatively charged ions that attach to airborne particles, making them heavier so they fall out of the air or stick to nearby walls, floors, and furniture. Particles are not captured in a filter, they settle onto surfaces, and can be stirred back into the air later.The ozone concern with ionizers
HEPA vs. ionizer: side by side
| Feature | HEPA purifier (AirPro) | Ionizer / ionic |
|---|---|---|
| How particles are removed | Trapped and held in a sealed filter | Charged, then settle on surfaces |
| Ozone | None (no ionizer) | Some models emit ozone |
| Odors and gases (VOCs) | Yes, via activated carbon | Limited |
| Re-release of particles | No | Possible when disturbed |
| Maintenance | Replace filter every 6–12 months | Wipe surfaces; clean plates |
Is UV-C the same as an ionizer?
No. The AirPro’s UV-C light is a germicidal stage that sterilizes bacteria, viruses, and mold captured by the filter. It is fully enclosed inside the unit, exposes users to no UV, and does not charge particles or generate ozone. UV-C and ionization are different technologies.Which is better for allergies, asthma, and kids or pets?
For allergy and asthma households, and around children and pets, a sealed HEPA filter is generally the safer, better-evidenced choice because it removes particles without any ozone risk. The AirPro’s 25 dB Night Mode and ozone-free design make it suitable for nurseries and bedrooms.An air purifier reduces airborne triggers but is not a treatment for any medical condition. Manage asthma and allergies with your clinician; see the EPA Guide to Air Cleaners in the Home for how filtration fits an overall plan.
Does the SonoHealth AirPro use an ionizer?
No. The AirPro is completely ozone-free with no ionizer. It cleans air using mechanical HEPA 14 filtration, activated carbon, and enclosed UV-C only, so you get high-grade particle removal without ozone.Bottom line
HEPA and ionizer purifiers both target airborne particles, but HEPA traps them safely in a filter while some ionizers emit lung-irritating ozone and let particles resettle. For everyday home use, an ozone-free HEPA 14 purifier like the AirPro is the safer, more reliable option.Related: UV-C Sterilization · How It Works · Do Air Purifiers Work? · AirPro vs. Competitors · AirPro Overview