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Do Air Purifiers Really Remove Viruses and Pet Danders?

air purifiers for pets allergies

Air purifiers have gained popularity as a means to improve indoor air quality, and they are often touted as effective in removing viruses and pet danders. But do they really live up to these claims? In this article, we will explore the science behind air purifiers and their effectiveness in removing both viruses and pet danders from the air.

Understanding Air Purifiers

Before we delve into the specifics of air purifiers and their abilities, let’s establish a clear understanding of how these devices work. Air purifiers are designed to clean the air in a room by removing various airborne contaminants. They operate by drawing in air and passing it through a series of filters or purification technologies, depending on the type of purifier.

The key components of air purifiers that play a vital role in removing contaminants include:

Filters: The heart of most air purifiers is the filter. High-efficiency particulate air (HEPA) filters are commonly used and are highly effective in capturing particles as small as 0.3 microns. These filters can trap allergens, dust, pet danders, and some viruses, among other particles.

Activated Carbon Filters: These filters are effective at adsorbing odors, volatile organic compounds (VOCs), and some gases. They are often used in air purifiers to address odors associated with pets and cooking.

UV-C Light: Some air purifiers use UV-C light to sterilize the air by inactivating certain bacteria and viruses. UV-C light damages the DNA of microorganisms, preventing them from reproducing.

Ionizers: Air purifiers with ionization technology release charged ions into the air, which can attach to particles and make them easier to capture by filters. Ionizers can help remove particles, including pet danders.

Effectiveness Against Viruses

Can Air Purifiers Remove Viruses?

The effectiveness of air purifiers in removing viruses depends on the type of air purifier and the specific virus in question. Let’s take a closer look at the different factors involved:

1. Filter Type
High-quality HEPA filters are efficient in capturing particles down to 0.3 microns, and many viruses fall within this size range. However, not all viruses are effectively trapped by filters. For example, larger viruses, like the influenza virus, can be captured, while smaller viruses, such as rhinoviruses, may not be as effectively filtered.

2. UV-C Light
Air purifiers equipped with UV-C light can effectively inactivate certain viruses, bacteria, and other microorganisms by damaging their genetic material. This technology can provide an additional layer of protection against airborne viruses.

3. Air Exchange Rate
The air exchange rate, which refers to how many times the air purifier filters the air in a room per hour, also plays a role in effectiveness. A higher air exchange rate means that the air is filtered more frequently, increasing the chances of virus removal.


It’s important to note that while air purifiers can be effective in reducing the concentration of some viruses in indoor air, they are not a foolproof method of virus control. Air purifiers cannot remove all viruses, especially those that are extremely small and resistant to filtration. Additionally, air purifiers are not a substitute for other essential measures to prevent virus transmission, such as vaccination, good hygiene, and social distancing.

Effectiveness Against Pet Danders

Can Air Purifiers Remove Pet Danders?

Pet dander consists of tiny, often microscopic, flecks of skin shed by cats, dogs, rodents, birds, and other animals with fur or feathers. These particles can become airborne and trigger allergic reactions in sensitive individuals. Air purifiers can be effective in addressing pet dander issues:

1. HEPA Filters
HEPA filters are highly effective at capturing pet dander particles, which are typically larger than many other airborne particles. They can reduce the concentration of pet danders in the air, providing relief for those with pet allergies.

2. Regular Filtration
By continuously filtering the air, air purifiers help maintain a consistently low level of pet dander in your home. This can be particularly helpful in homes with shedding pets.

3. Activated Carbon Filters
In addition to capturing pet dander, activated carbon filters can also help in adsorbing pet odors, making the indoor environment more pleasant.


While air purifiers are effective in reducing pet danders in the air, it’s important to recognize their limitations:

Pet Dander on Surfaces: Air purifiers primarily address airborne pet dander. To comprehensively manage pet allergies, it’s essential to also clean and vacuum surfaces where dander may accumulate.

Individual Sensitivity: The effectiveness of air purifiers in addressing pet dander allergies can vary depending on an individual’s sensitivity and the specific pet’s shedding characteristics.

Tips for Choosing the Right Air Purifier

When selecting an air purifier for pet dander and  virus removal, consider the following factors:

Filter Type: Ensure the air purifier has a HEPA filter or an equivalent high-efficiency filter to capture viruses and pet danders effectively.

Additional Technologies: If you’re concerned about virus control, consider a purifier with UV-C or other virus-inactivating technology. For pet danders, activated carbon filters can help with odor control.

Room Size: Choose an air purifier appropriate for the size of the room to ensure adequate air circulation and filtration.

Air Exchange Rate: Opt for a purifier with a high air exchange rate to filter the air more frequently.

Maintenance: Regularly replace filters, clean the purifier, and follow the manufacturer’s maintenance instructions for optimal performance.


Air purifiers for home are valuable tools for improving indoor air quality and can be effective in reducing both viruses and pet danders in the air. However, their effectiveness depends on factors such as filter type, additional technologies, room size, and air exchange rate. It’s essential to recognize that while air purifiers can contribute to a healthier indoor environment, they are not a sole solution for virus control, and other preventive measures remain critical. Similarly, for pet dander allergies, a combination of cleaning, grooming, and air purification is often the most effective approach to reducing allergen exposure. Ultimately, the right air purifier can help create a more comfortable and healthier living space for those dealing with viruses and pet allergies.

Do Air Purifiers Really Remove Viruses and Pet Danders?

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