> ## Documentation Index
> Fetch the complete documentation index at: https://docs.sonohealth.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Best Air Purifier for Asthma — HEPA 14 for Cleaner Breathing

> What to look for in an air purifier for asthma: HEPA 14 filtration, activated carbon for VOCs, enclosed ozone-free UV-C, and quiet night operation. How the SonoHealth AirPro fits.

The best air purifier for asthma captures ultra-fine triggers, adds no ozone, and runs quietly enough for overnight use. The SonoHealth AirPro pairs medical-grade **HEPA 14 (99.995% at 0.3 microns)** with activated carbon and **fully enclosed, ozone-free UV-C**, covers up to 1,200 sq ft, and runs at 25 dB in Night Mode — starting at **\$169**.

## Why filtration grade matters for asthma

Asthma flare-ups are often triggered by microscopic particles: dust-mite debris, pet dander, mold spores, pollen fragments, and fine smoke. Standard "True HEPA" (HEPA 13) captures 99.95% of particles at 0.3 microns; **HEPA 14 captures 99.995%** — about 10x fewer particles slipping through. Over hours of continuous use, that difference means fewer airborne triggers reaching sensitive airways. See [HEPA 14 Filtration](/air-purifier/hepa-14-filtration).

## Avoid ozone: it can make asthma worse

This is the single most important safety point for asthma. **Ozone is a lung irritant that can worsen asthma**, and some ionizing or "ozone-generating" purifiers emit it. The AirPro uses **mechanical HEPA 14, activated carbon, and fully enclosed UV-C only — no ionizer and no ozone.** If you have asthma, avoid ozone generators entirely.

<Warning>
  Do not use ozone-generating air purifiers if you have asthma. The California Air Resources Board lists ozone as a respiratory irritant that can worsen asthma and reduce lung function. Choose ozone-free mechanical filtration.
</Warning>

## What to look for in an asthma air purifier

| Feature               | Why it matters for asthma                                | AirPro                      |
| --------------------- | -------------------------------------------------------- | --------------------------- |
| High filtration grade | Captures the ultra-fine triggers that reach the lungs    | HEPA 14 (99.995% at 0.3 µm) |
| Activated carbon      | Adsorbs VOCs and smoke that irritate airways             | Yes (Stage 3)               |
| No ozone              | Ozone worsens asthma                                     | None (no ionizer)           |
| Quiet night operation | Continuous overnight filtration without waking you       | Night Mode 25 dB            |
| Adequate coverage     | Cleans the whole room, not just a corner                 | Up to 1,200 sq ft           |
| Enclosed UV-C         | Stops microbes regrowing on the filter, no user exposure | Yes (254 nm, enclosed)      |

## Room size and air changes

For asthma, aim for a purifier that cycles the room's air **at least 4-5 times per hour**. The AirPro cleans about 430 sq ft in 10 minutes, cycling a typical bedroom several times an hour — well above the minimum. For sizing help, see [Room Coverage](/air-purifier/room-coverage) and [Best Air Purifier for Large Rooms](/air-purifier/best-air-purifier-for-large-rooms).

## Nighttime asthma and sleep

Many people with asthma notice symptoms worsen at night. A purifier that runs quietly overnight keeps allergen and irritant levels low while you sleep. The AirPro's **25 dB Night Mode** dims its lights and runs continuously, so it won't disturb sleep. See [Asthma Relief](/air-purifier/asthma-relief) and [For Bedrooms](/air-purifier/for-bedrooms).

## Does the evidence support air purifiers for asthma?

Research and public-health agencies find that HEPA filtration can reduce indoor particulate and allergen levels and may ease respiratory symptoms — but it works best **alongside** removing pollutant sources, controlling humidity, and following your asthma action plan. A purifier is one part of a management plan, not a cure or a replacement for medication.

<Note>
  An air purifier reduces airborne triggers; it does not diagnose, treat, or cure asthma. Keep taking prescribed controller and rescue medication and follow your clinician's asthma action plan. The [EPA Guide to Air Cleaners in the Home](https://www.epa.gov/indoor-air-quality-iaq/guide-air-cleaners-home) explains how filtration fits alongside source control and ventilation.
</Note>

## Pricing

* **1-pack:** $169 (was $219)
* **2-pack:** $249 ($124.50/unit)
* **4-pack:** $459 ($114.75/unit)

Every purchase includes a **60-day free trial** and a **2-year warranty** (upgradeable to lifetime with a filter subscription).

***

**Related:** [Asthma Relief](/air-purifier/asthma-relief) · [Best Air Purifier for Allergies](/air-purifier/best-air-purifier-for-allergies) · [Best Air Purifier for Smoke](/air-purifier/best-air-purifier-for-smoke) · [HEPA vs. Ionizer](/air-purifier/hepa-vs-ionizer-air-purifiers) · [Buy AirPro](/air-purifier/buy)