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Air Ionizer Dangers: Are Ionic Air Purifiers Safe?

Air ionizers are designed to help provide cleaner air and they do this by utilizing ionized particles. But a lot of questions tend to come with the use of air ionizers, one of the most common being…Are air ionizers dangerous?

The Short Answer: It depends on who you ask. Some critics believe that air ionizers give off dangerous levels of ozone which is not only harmful to the environment, but can be equally as hazardous to your health.

air ionizer dangers - air quality
Ozone exists in 2 levels of the atmosphere: in the stratosphere (good – protects us from the sun’s rays) and at the ground level (bad – toxic when breathed in)

When inhaled in high enough doses, ozone can have harmful effects– including damage to your lungs, chest pain, coughing, or shortness of breath.

Because of this concern, federally-mandated standards restrict the amount of ozone any air purifier can give off. These restrictions help to ensure that any potential ozone exposure remains at a safe level.

Air ionizers vs. Ionic air purifiers

First things first, let’s get our names straight. In the air purifier market, there are air ionizers and there are ionic air purifiers.

Rabbit Air Purifier Filters
The Rabbit Air MinusA2 uses 5 different filters and an ionizer as the last purification stage

What’s the difference?

Basically nothing.

These are two different ways to talk about the same technology, electrically charged molecules being used to help purify the air. In this guide, we’ll be calling them air ionizers– so let’s continue.

How do air ionizers work?

A typical air purifier would use fans or filters to help remove contaminants and purify the air. In the case of air ionizers, they rely on the use of electrically charged air molecules, or ions, to do the same job.

RELATED – See our full list of air purifier reviews.

Every room is filled with positively charged particles, which could be made up of dust, microbes, odors, airborne bacteria or illnesses, smoke or other allergens.

The job of an air ionizer is to release negatively charged particles that are then attracted and bond to the positively charged particles in the room.

how air ionizers work

When the ionized particles bond to the airborne particles, the joint union is then too heavy to float in the air and they fall to the ground. Once they’re no longer airborne, these particles can be vacuumed up, or dusted off of furniture and raised surfaces.

What are the benefits of air ionizers?

Negative ions produce a number of benefits in our natural environment.

Think of some of your favorite places. Maybe it’s the ocean, a serene waterfall or out in nature’s greenery.

Ionic particles produced by waterfalls

This short list here includes some of the natural environments with the highest levels of detected negative ions present

Air ionizers and their connection to negative ions can mean big benefits to your respiratory system and overall health. The use of negative ions in the air can have the following results:

  • Improved air quality through the removal of dust, allergens, pollen, pet dander, mold spores and other airborne bacteria.
  • Decreased exposure to airborne respiratory bacteria like colds, flu, and asthmatic triggers
  • Improved sleep and overall mood, according to a 2012 Italian study that looked at the evidence base for the benefits of negative ions in improving mood and treating mood disorders
  • Relief from seasonal or chronic depression— according to a study from Columbia University, negative ions can have as much of an effect as prescribed antidepressants

All this sound too good to be true?

Some people would say yes. Let’s talk about the potential negative side of negative ions.

What are the dangers of air ionizers?

So naturally occurring negative ions are highly beneficial and share all of the benefits listed above. In the case of air ionizers, these negative ions aren’t naturally occuring, but instead are created through a method called “electric-discharge”.

air ionizer dangers - air quality

During the process of electric discharge, the negative ions that are produced may give off ozone, which can be a very harmful and toxic gas.

What is ozone?

Ozone is a colorless gas that exists in two levels of our atmosphere– one is good and one can be not so good.

air ionizer dangers - oxygen vs. ozone
Oxygen has 2 oxygen atoms while ozone is made up of 3 oxygen atoms, making it toxic for humans to breathe.

On one level, it exists in the stratosphere (which is approximately 6-30 miles high) and helps to protect Earth from the sun’s harmful radiation.

On another level, it also exists at the ground level, which is the air we breathe. Ozone in this part of the atmosphere is not good.

Ever see those ozone alerts as you drive down the highway or on the nightly news?

These are generated to let you know that ozone levels at the ground level may be reaching unsafe levels.

High ozone levels in the air you’re breathing can have really nasty side effects including damage to your lungs, chest pain, coughing, or shortness of breath.

Do air ionizers emit ozone?

So the million dollar question- do air ionizers emit ozone?

In short, yes they do.

Any man-made high-energy particle, like a negatively charged ion can generate ozone as a by-product of the molecular reaction.

Anyone remember the Ionic Breeze from Sharper Image? This product was one of the first air ionizers that came out.

Initially it was widely popular, but trouble came when third-party review sites began to question not only the validity of the air purification system, but also the dangerous levels of ozone that it was emitting.

SHarper Image Ionic Breeze air ionizer advertisement -1999 - source: The Hustle

What resulted from this product was a class action lawsuit, bankruptcy for Sharper Image in 2008, and revised federally-mandated standards (under the Clean Air Act) that put limits on the amount of ozone that a machine like this could generate.

Under these new regulations, the US Food & Drug Administration (FDA) required that indoor medical devices can only produce a maximum of 50 ppb (parts per billion) of ozone.

For comparison, the National Institute of Occupational Safety and Health (HIOSH) advises that indoor ozone levels be no greater than 100 ppb.

Air ionizers today are often fitted with ozone sensors that help to monitor, suppress, and prevent high levels of ozone from sneaking out into the air you breath.

The Bottom Line

Deciding whether or not an air ionizer is right for you is a personal decision. There are certainly benefits to air ionization that be difficult to achieve with a standard air purifier, but with those benefits also come potential risks.

Ozone is a real threat to our health, when consumed in high levels, but today’s air ionizers are federally-restricted in the amount of ozone that can be produced as a by-product of these machines.

At the end of the day, you have to decide for yourself and your family if the benefit of ionized air outweighs the potential risk of increased ozone levels.

Do your research, understand the technology, and move forward into a home with cleaner air.

12 thoughts on “Air Ionizer Dangers: Are Ionic Air Purifiers Safe?”

  1. What about plasmawave ? According to my research this doesn’t produce any ozone ! BTW is plasma ionizer the same bipolar ionizer ?

    • This is the first I had heard of the Plasmawave. I just talked with a friend of Modern Castle, an air purification expert that has been designing and building air purifier systems for 25 years.

      Here’s what he said:

      “If an air purifier doesn’t create ozone then it’s not effective against pathogens. They create weak and short lived ions. These type units might create ions that might do a little something within 3-6ft and may filter air within a small area. The UV does nothing to air flow. The UV can have an affect on stationary surfaces only.”

  2. I found your information doing research for my severe contact dermatitis. I have done patch testing and have stopped using all skin care and cleaning products that contained the allergens that I reacted negatively too. However, this did not prevent sever flares particularly in my face. As a result I am now on immunosuppressant medication. We have several New Comfort ionization machines in our home. When we first got them my husband turn them on high which resulted in severe coughing and asthma conditions for me. We turn them down on low and my Dr prescribed an inhaler for me until my breathing was normal again. My question to you is could this also be causing an allergic reaction with my skin?

    • Hi Diane,

      Unfortunately, that is well beyond our expertise level to say. You should consult your doctor with that question. They will have better knowledge than we do.

      If you think a product (any product) is making you sick you should stop using it immediately.

  3. In reply to your (Derek Hales) response to Cari; what about a hepa air purifier that has a ionizer switch? In that case you can leave the purifier running 24/7, would it be helpful to turn the ionizer on only every few days?

    • I would also suggest leaving the ionizer on for the same reason.

      Ultimately, both the ionizer and HEPA filter are working collectively to remove particulates floating in your air.

      If those features are not on then their performance will reduce, and particulates will increase in your air.

  4. What is AQI. Why don’t you write down what the letters mean e.g. US Food & Drug Administration (FDA) and then you can use AQI. However, if you explained this in the beginning and several paragraphs have been written, then explain the letters again. Derek Hales used it in his explanation and I suppose no one thought to find out what he was talking. I would assume Air Quality Index, however what do I know, you wrote the article and maybe you don’t know what Derek Hales was talking about. By the way who the hell is Derek Hales?

    • My apologies.

      AQI = Air Quality Index

      It’s a measure used by governments to communicate how polluted the air is. The higher the number, the worse your air quality is.

      I am Derek Hales. I run Modern Castle, along with a small team. You can read more about my team and I here –

  5. Idea: just don’t leave the air ionizer air purifier constantly on. Use it every couple of days. Some air purifiers come with the air ioniser option, it’s just turned it on and off over time. Don’t have it on consistently. If you think your air is polluted in your house, just use it for an hour or a few hours or every couple days and then once a month or something like that or once a week. Just an idea.

    • I’m not sure that would work well for most homes, Cari.

      The problem is that most homes let particulates in from the outside almost constantly. Opening doors, windows, and HVACs are the most common ways that particulates get in your home. I live Phoenix, Arizona, a city with relatively low pollution. However, our outside AQI is frequently between 50 and 80. This isn’t bad, but it’s also far from good.

      With air purifiers running all the time in my home I’m able to keep a PM2.5 of less than 2 just about everywhere.

      However, all it takes is turning the air purifiers off for a couple of hours to see that rise to 10-20 AQI. And it will keep increasing from there.

      In some areas of my home I can see an increase from AQI of 1 to 15 in as little as an hour.

      As a result, I think it’s far better to leave your purifier on most of the time, but definitely all the time you’re in your home.

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