"Does an air purifier actually pollute the air with ozone?" It is a question we receive regularly, and it is a completely valid one. At high concentrations, ozone (O3) can irritate the airways, so you do not want a device intended to improve your air quality to actually create a new problem. The honest answer: it depends entirely on the type of device and the technology used.
The short answer
Most modern air purifiers that use HEPA filtration, such as the Dynter AirPure Plus PA244, do not normally produce a significant amount of ozone. These devices clean the air mechanically: a fan pulls air through multiple filter layers, where particles are physically trapped. There is no chemical reaction involved that produces ozone as a byproduct.
Which devices can produce ozone?
Ozone can be produced by devices that use certain technologies:
- Ionizers: devices that release (only) negatively charged ions into the air can generate small amounts of ozone as a byproduct, depending on the design and power.
- Electrostatic precipitators without proper shielding, which use high voltage to charge particles.
- "Ozone generators": these are separate devices designed to intentionally produce ozone, often intended for odor control in unoccupied rooms. These are not the same as a regular air purifier and are not recommended for use in occupied spaces.
Especially older models, or cheap devices that run exclusively on ionization without a HEPA filter, carry the highest risk of ozone emissions exceeding current guidelines.
What should you look for when purchasing?
If you want to be sure that an air purifier does not produce significant ozone, pay attention to the following:
- Check whether the device uses HEPA filtration instead of (only) ionization
- Check if an ozone certification is mentioned, such as the American CARB standard, which dictates a maximum ozone emission
- Be cautious with devices that explicitly promote themselves as "ozonators" or "ozone generators" for daily use in a living room or bedroom
- Read independent reviews and specifications instead of relying solely on marketing claims
Is a small amount of ozone dangerous?
At elevated concentrations, ozone can irritate the airways and cause symptoms in sensitive people, such as coughing or a burning sensation. At low concentrations, such as those sometimes found outdoors, the risk is limited. Nevertheless, caution is advised: those who spend a lot of time indoors should choose a device known to emit no relevant ozone, especially in bedrooms where you are exposed to it for hours at a time.
Why does Dynter choose HEPA instead of ionization?
In the development of air purifiers, this is exactly why we choose mechanical HEPA filtration instead of ionization technology. The AirPure Plus PA244 uses a 4-stage filter system including a HEPA13 filter, which captures 99.97% of particulate matter, pollen, bacteria, viruses, and microplastics without ionization or any ozone-generating process.
Our advice
In our experience, when in doubt, it is always wise to choose an air purifier that is transparent about the technology used and that works with HEPA filtration. This way, you can be sure that your device is actually making the air cleaner, without unintended side effects.