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Do All Air Purifiers Emit Ozone?

No, not all air purifiers emit ozone, but some can. Air purifiers that use electricity during the cleaning process, like electronic air cleaners (ionizers) and ozone generators, have the potential to produce ozone.

This article explains the types of air purifiers, and their potential to emit ozone, and provides guidance on choosing the right air purifier to ensure a safe indoor environment.

Understanding Ozone

While ozone in the upper atmosphere (forming the ozone layer) protects us from the sun's harmful ultraviolet rays, ground-level ozone is a pollutant. It can cause respiratory problems, exacerbate asthma, and lead to other health issues when inhaled.

It’s important to remember, though, that there’s ozone everywhere on earth. It only becomes a problem when it reaches harmful concentrations. The EPA and other regulatory agencies set standards for how much ozone constitutes a safety risk

Types of Air Purifiers

Air purifiers come in various types, roughly categorized based on the mechanisms they use for cleaning air. Understanding these types helps clarify which ones might emit ozone.

HEPA Filters: High-efficiency particulate air (HEPA) filters are the gold standard for their ability to trap airborne particles such as dust, pollen, and pet dander. These filters work by forcing air through a fine mesh that captures these particles, preventing them from circulating in your home. 

Activated Carbon Filters: These filters are designed to absorb gases and odors, including VOCs. Activated carbon filters work by trapping these gaseous pollutants on a bed of activated carbon. Like most HEPA filters, activated carbon filters are ozone-free, making them a safe option for improving indoor air quality.

UV-C Light Purifiers: Ultraviolet (UV-C) light purifiers use ultraviolet light to minimize bacteria, viruses, and other pathogens. While effective at relatively sterilizing the air, some UV-C light purifiers can produce trace amounts of ozone. The amount of ozone produced depends on the specific design of the purifier.

Ionizers and Ozone Generators: Ionizers work by releasing charged particles into the air, which attach to pollutants, making them heavy enough to fall out of the air or be captured by filters. Ozone generators deliberately produce ozone to clean the air. Both of these devices can emit significant amounts of ozone, which can pose health risks, especially in poorly ventilated areas.

Health and Safety Concerns

Exposure to ozone can have various health impacts. Inhaling ozone can cause respiratory irritation, shortness of breath, and coughing, and can exacerbate chronic respiratory conditions like asthma. 

That said, air purifiers, even the ones that generate ozone, rarely increase ozone concentrations to dangerous levels. But, if you’re concerned about ozone or live in an area that has elevated ground ozone levels to begin with, consider choosing an air purifier that doesn’t emit ozone.

Pet Safety and Air Purifiers

Pets can be sensitive to most indoor air pollutants, including ozone. Ozone exposure can cause respiratory distress in pets, leading to symptoms such as coughing, sneezing, and difficulty breathing. Pets with pre-existing respiratory conditions are especially at risk.

To ensure pet safety, use pet-friendly air purifiers that do not emit ozone or produce less than the limits established by regulatory bodies. 

All Rabbit Air air purifiers have been tested and meet the ozone safety standards established by the California Air Resources Board. The MinusA2 model emits zero ozone at all speeds when the Negative Ion Generator is turned off.

Regular maintenance of air purifiers can also help to ensure they continue to clean the air and maintain indoor air quality effectively. This maintenance typically involves cleaning the exterior of the purifier, checking and replacing filters as needed, and ensuring proper ventilation around the unit. Homes with many pets often need more frequent maintenance and filter replacements to accommodate the increased activity.

Choosing the Right Air Purifier

When selecting an air purifier for your home, especially if you have pets, consider the following features to ensure it is safe and effective:

  • HEPA or Activated Carbon Filters: Look for purifiers that use these filters as they are proven to be effective and do not emit ozone.
  • Noise Level: Choose quieter models to avoid disturbing your pets.
  • Size and Coverage: Ensure the purifier matches the size of the room where your pets spend the most time. Also, consider that seasonal changes in air quality may increase the load on your air purifiers.
  • Certifications and Testing: Check for certifications from reputable organizations that confirm the purifier's safety and effectiveness, such as the AHAM (Association of Home Appliance Manufacturers) or the California Air Resources Board (CARB).


Choosing the right air purifier is essential for maintaining a clean and safe indoor environment for all household members, including pets. 

Not all air purifiers emit ozone, and understanding the types that do is crucial for making an informed decision. 

By selecting the appropriate air purifier and following proper maintenance practices, you can enjoy the benefits of clean indoor air while protecting the well-being of your family and pets.

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