Which is better: An ionizer or air purifier?

Discussing which device is more effective, between an air purifier and an ionizer, for achieving better air quality, and how to pick the best option for your needs.


There are devices that alter and usually improve air quality in a room. These devices are called air purifiers and ionizers. These two devices work differently to improve the condition of the air in the room.

If you want to achieve better air quality in the spaces around you, you should understand the differences between the two devices and how they work to improve and alter the air quality around you.

Ionizer vs air purifier

An ionizer and an air purifier both keep the air quality in a room at its best, however, they do this differently. In comparing the two you need to understand how each one works, in order to weigh them up against each other and decide which one will be the better option for you.

Each device will cater to different needs related to air quality. They are usually quite easily available at local stores, or online from retailers like Amazon.

Some air purifiers and ionizers that Amazon has available to purchase are listed below.

Brand Description Amazon price

ONPDHIKE Ionizer Air Purifier

Buy it on Amazon 
·   Can release the ion function 360 degree omnidirectional

·   Can be used in different air cleaning scenarios


Levoit Air Purifier

Buy it on Amazon
·   Filters air pollution such as dust, pollen, pet odours, smoke, and allergens

·   Refreshes air five times an hour in large rooms, in 12 minutes


Which is better: An ionizer or air purifier?

The better option for you will depend on the functions of each of the devices and whether you need the functions they provide.

There is no set claim that states one device is better than the other, except as it pertains to the individual needs of the person purchasing it.

Ionizers function by releasing electrically charged ions into the air that attach to harmful impurities in the air and make them much heavier until they fall to the floor or stick to surfaces. These particles can, however, be stirred back into the air in one way or another.

Purifiers, on the other hand, work by drawing air into the unit itself and trapping contaminants so that you do not inhale them. It circulates clean air in the room, but is limited compared to an ionizer that can eliminate smaller particles.

Both of these devices highly benefit sufferers of allergies.

Using air purifiers and ionizers

Since both of these devices, albeit differently, remove contaminants from the air of a room, they are to be used and maintained uniquely.

Air purifiers make use of HEPA (high efficiency particulate air) filters that can remove and trap up to 99.97 percent of dust, allergens, and microorganisms. These filters need to be replaced regularly.

Ionizers, on the other hand, do not make use of filters, but it is worth noting that the bonded particles captured and weighed down by ionizers can still, at any point, be lifted or shifted back into the air by different contributors or motions.

The risks of choosing an ionizer

If you are considering an ionizer over an air purifier, you should be aware that it can pose a risk. Ionizers can emit small quantities of ozone when emitting charged particles.

Some people are more sensitive to ozone and can potentially have adverse reactions to increased levels of ozone in their homes or spaces.

It is advised that you avoid an ionizer if you know you are sensitive to ozone, as it can lead to exacerbated respiratory irritation. That being said, an ionizer is the worst option to choose if you have asthma or any respiratory conditions.

Area coverage between ionizers and air purifiers

Area coverage is another thing to consider when choosing between an ionizer and an air purifier. Purifiers use physical filters and, therefore, their area coverage is not as large as that of ionizers.

The largest room size a HEPA filter can effectively purify is up to approximately 1 500 square feet, while ionizers can reach an area coverage of up to approximately 3 500 square feet.

This means that ionizers can be particularly good for cleaning the air in larger rooms, in homes, and in business spaces.

Final thoughts

If you are considering getting a device that can clean and improve the air quality of a room, then an air purifier or an ionizer might be the right device for you. Each one works differently to achieve better air quality in a particular space.

When deciding which one is better for you, you need to compare how the two work, and whether their functions align with how you want to achieve better air quality in your space.

Ultimately, you should make the best decision for your unique needs between these two devices.

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