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Ionizer vs. Ozone Generator – The Good, The Bad, The Best

W hether we are talking about allergens or odors, any contaminant that floats into the air can reduce its quality. Over time, all sorts of machines have been invented to fight pollution and restore breathing hygiene in users’ homes. There are air purifiers that use HEPA and Carbon activated filters against dust, pollen, and smoke, UV-lamps that have the purpose of killing bacteria and germs, ionizers, which in many cases came as an additional function to classical air cleaners, and ozone generators.

In this article, we will discuss the last two categories, ozone generators, and ionizers, two rather innovative products, which were used first industrially and only recently became available for home use. So, stay with us as we discuss the good, the bad, and the best of each machine type and compare them to see which one is worth purchasing.

Ionizer generating ions Image


There’s a huge difference between ionizers and ozone generators, not only regarding the technology but the targeted contaminants. An ionizer will deal with airborne particles, while an ozone generator will only target gases.

How does an ionizer work?

Before explaining the ionization process, we must define the most important element it operates with: the ion. Basically, an ion is an atom that has either gained or lost an electron. When it loses an electron, it becomes positively charged, while if it gains an electron, we call it a negatively charged atom.

Ionizers produce ions either by using a nuclear source (polonium), and this is called alpha ionization, or by using an electrical source to create a bipolar air (corona ionization). In air-purifying systems designed for home use, the most commonly found is the second option, which functions as follows:

  1. High voltage current is produced and directed towards a metallic prong/needle
  2. Electrostatic repulsion actions upon negatively-charged electrons and sends them into the air
  3. When the ions encounter oxygen or nitrogen particles, they attach to them
  4. They also attach to dust and other pollutants, forming heavier compounds
  5. In the end, the compounds are too heavy to float around, and they fall on the ground, leaving the air clean

The Good

The main advantage of an air ionizer is that it doesn’t use filters as an air purifier nor plates as an ozone generator, so basically, you won’t need to replace anything. This translates in very low functioning costs and almost no maintenance, so this type of cleaner is definitely the most comfortable of all. Besides that, it can make particles as small as 0.1 microns to collapse to the ground, a performance that overcomes the HEPA’s, which usually can deal only with particles down to 0.3 particles. Ionizers can also reduce static electricity, which can sometimes cause fatigue, therefore they restore a good vibe into the house.

The Bad

Unlike ozone generators, which require you to leave the room, an ionizer can do its job no matter if there’s someone in the room or not. Nevertheless, it does release a small amount of ozone, and here’s where the controversy starts. Some critics will tell you that the level of ozone released by ionizers is dangerous for your health while others will argue that it is too low to affect you in any way. The truth is that it depends. When purchasing a unit of this type, you should check that it has been approved by the FDA. And it is better to go with renowned brands which have already made a name for high standards in testing their products.

Another disadvantage is that these devices don’t collect the dust and allergens that are weighted down to the floor or furniture. So, all the dust in the air will deposit around the house and you will need to vacuum more often. Furthermore, although some brands may claim their devices are effective against mold, studies showed that they don’t affect it in any way, so you shouldn’t rely on them for solving this problem.

The Best

These devices are a long-term cheap solution for users suffering from allergies or respiratory illnesses. As the ions attract not only dust but bacteria and even smoke, they ensure that the air is always clean and fresh, without posing any threat to the user’s health. Plus, the sound produced by one of these units is generally so low that it resembles a whisper.

Ozone Generator functioning principle Image

Ozone Generator

Many users compare the freshness left behind by an ozone generator with the invigorating smell that remains after a thunderstorm, and once you get into the details of its functioning, it is easy to understand why.

How does it work?

The ozone is the main product released by this type of machine, which is basically another form of oxygen, meaning that instead of two molecules it has three, with the last one being unstable and open to interacting with the gases in the air. Ozone exists in the atmospheric layers and acts as a barrier against UV rays, which, unfiltered, can be harmful to human skin. However, if found on the ground, it is dangerous and can cause serious health problems if inhaled. That’s why ozonation should always be performed in empty rooms. Here’s how it happens (corona discharge):

  1. The oxygen is drawn into the unit and cleaned with the help of filters and dryers
  2. Electrical discharge (similar to lighting) actions upon the cleaned oxygen, generating ozone
  3. The newly-created ozone is released into the room
  4. It interacts with pollutants breaking them down and thus removing the source of bad odors
  5. The remained ozone molecules will eventually decompose into oxygen

The Good

The main advantage offered by these generators is that they don’t need to work continuously. In fact, a few hours every week are enough to maintain the house odor-free. Another benefit is their action on mold and mold odor, which is, as we know, very difficult to remove. Ozone generators are used by hospitals for sanitation and are appreciated for their ability to kill bacteria and viruses that tend to multiply especially in homes with pets.

The Bad

The use of ozone generators for air purification at home is highly disputed. As we have mentioned, if inhaled, the gas is toxic and tends to linger a period after the air cleaning has been performed. The doors and windows need to be sealed so it doesn’t spread in the entire house. Moreover, it has proven efficient only against certain gases, while all the others either remain uncovered or require an incredibly long time to be destroyed. Bacteria and germs will also require to be exposed to a huge quantity of ozone in order to be killed. Plus, there’s always a health risk.

The Best

If used in rooms that are not linked to the house, like greenhouses, these devices will perform exceptionally, eliminating mold while not affecting the plants at all. And there’s always the fresh smell they leave behind that can never be obtained with an ionizer or an air purifier.

Ionizer vs Ozone Generator Image

Side-by-Side Comparison

Criteria Ionizer Ozone Generator
Ozone Release Low quantities that are usually not dangerous for health High quantities, as ozone is used to purify the air. Nevertheless, if instructions are followed, in most cases you won’t inhale enough of it to herm you
Target They act upon airborne particles and allergens, drawing them to the ground. It cannot handle odors, mold, or VOCs The ozone is highly effective against odors and mold, and are sometimes used for sanitation in medical units
Power Consumption Ionizers usually require less power to work, but need to be turned on all the time for their action to be effective. Most models will draw under 100W The power consumption rate is equal or over 100W, but these devices only need to work 30 minutes once a week for the air to stay fresh, so they can be considered more economical
Maintenance These models can be super cheap and easy to maintain if you stick to the basic functions. However, some of them can include a HEPA filter and an Activated Carbon Filter, designed to improve their efficiency. If you go for the second variant, you will have to deal with filter replacement and additional maintenance costs. They work on ceramic plates which can last for years until you will need to replace them. Moreover, they are less expensive than a HEPA, so you will save yourself some money.
Noise They aren’t the quietest among the air purifying systems on the market. Actually, at high speed, they will overcome 60 decibels, while at low speed they can only reach a minimum of 40 decibels. They produce a white noise which is similar to the sound of a fan on high speed. You won’t be in the room, so you don’t have to worry that it will affect your peace anyways. Nevertheless, it is good to know that it is quiet enough not to disturb the neighbors.
Runtime Should run continuously for best results Short running time – only 30 minutes once or twice a week

Bottom Line

As shown, these machines are designed to tackle different problems and have different principles of functioning. Nevertheless, we must take into account that they will be used inside a house, and in this case, safety is the most important. An ionizer will be the best option, especially if we are talking about a house with kids and pets, as, this way, the risk of accidental exposure to ozone can be avoided. Moreover, the ionizer is more comfortable to use as it only requires to be plugged in. You don’t need to make preparations or open the windows and wait for a harmful gas to leave the room. And you can use it in the car as well if you fo for a plug-in option.

Ozone generators are used industrially and can be used at home, but with high precautions. They do have a timer that stops their action after a certain time so you don’t have to enter the room, but as the gas persists for a long period, it is almost impossible not to get in contact with it. As we have mentioned, it is better to use them in greenhouses or rooms that are separated from the house.

Lillian Davies
Lillian Davies
Lillian is a fresh college graduate who has lived in Tucson for most of her life, battling the torrid heat ever since she was a child. She is quite versed in the topic of thermal comfort and what solutions work to make conditions more bearable when the temperatures go haywire, which makes her knowledgeable in the topics she writes about here. Since she is a perfectionist, Lilian always takes time to polish her articles before release, which makes her an irreplaceable part of the team.

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