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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.

Need Help? Ask Your Question Below

  1. I just purchased Air Genie plug- in ionic air purifiers. I was told I needed one unit per 12×12 space. I purchased these to clear formaldehyde being emitted by new furniture. Will these work for this purpose and are they safe?

    • We haven’t tested them, so I cannot say for sure.

      Given the size of the units, I am doubtful they are that effective. I’ve seen units 10 times this size fail to purify a 12×12 room well.

  2. Hello
    I purchased on air oasis company a HVAC system and I am concern if this product have any side effect on my family
    Thank you

    • I’m unfamiliar with that company.

      If you’re concerned you may want to contact a local air specialist, someone who can test the air in your home to verify safety.

  3. Do you know the model number of the Sharper Image Air Purifier that was involved in the lawsuit or does it apply to all of their air purifiers?

    • I don’t know the exact model number.

      But it was their line of Sharper Image Ionic Breeze air purifiers.

  4. Hi, thank you for all the information. Just want to ask about the personal wearable air ionic perifiers. I cannot find anything on the product website that addresses ozone. Do you have any thoughts on the wearable devices? Thanks much

    • It’s likely that the ions generated via this necklace aren’t powerful enough to harm you.

      However, I also think it’s doubtful that a device this size would be effective at purifying the air.

      High energy ions = great at cleaning air at distance, but dangerous
      Low energy safe ions = not great at cleaning air, except at close range, but safe

      Because the range is so close there’s a possibility it actually does purify the air well, but I do have my doubts given the size and the fact it’s powered by a battery.

  5. Hello, I purchased 2 of these to be used in the highschool basketball gym that is about 5000 sq ft. It will be used when we have practices and games. I would like to know if it is safe to use. After reading this article, I am not sure anymore.
    New Comfort Commercial Air Purifier. (link to product)

    • You absolutely should NOT use it while anyone is in the gym. It is not safe to use when humans or animals are present.

      I would suggest you reach out to the manufacturer to see how long they suggest running the ozone generators for a space that size and how long it will take for the ozone to dissipate. You need to give it adequate time to dissipate from the room before people are safe to go back in that space.

  6. 嗨!德里克:

    • 謝謝!




      Thank you!

      Yes, that is my understanding also.

      Most ionizers operate well below this level. The only ones I would be really careful of are those that purifier that air as an ozone generator. Those have the potential to be far more dangerous.

  7. Hi, do you think this “Woodpecker High-pressure Plasma Air Purifier” is safe and effective for use in a dental surgery?
    we are considering due to COVID-19, it’s really difficult to understand whether HEPA/UV/ or this “High Pressure Plasma Air Purifier” would be the best option
    There are 2 sizes and we would be looking at the Q3 as it is a small room <25 square metres. Thanks in advance.

    • I’ve never heard of that brand and the amount of information provided here just isn’t sufficient to say whether it’s safe or not.

      I’m also not as familiar with Chinese product safety standards. Which makes me more uneasy to say one way or another.

  8. Hello,
    I just bought the Aera Max DX5 air purifier but it has a PlasmaTRUE Technology- Creates an ionized field to help safely remove airborne pollutants.
    I was wondering what does that mean and if its harmful to us.

    • Most air purifiers with an ionizer feature on the market are perfectly safe. I just took a quick look at the Max DX5 spec’s and I don’t see anything that would lead me to believe it’s not safe (that said, the spec pages I was able to find don’t even mention an ionizer).

      Air purifiers with an ionizer are generally safe because the ionizes are not energized enough to be harmful to you.

      What you want to avoid and/or be extremely careful use are standalone ozone generators, like this – – while it can be safe if used properly, it is harmful to humans. So you need to only use it in locations where people won’t be in the area while it’s in use and after for some hours.

  9. This is a wonderful article. I am dentist in UK and do you have any suggestions as to which purifier to use in a dentist room from removing the viral load standpoint? Any specific model you would recommend which are not ionisers as from your replies I gather Ioniser with Ozone is not good in the long run. many thanks

  10. First I think this article was written with much effort. I give credit for effort and intentions. Ions are the most infinite broad subject matter on the earth. The number of different areas multiple degree physicist’s run the show behind closed doors under disclosure statements world wide is rarely a thought in someones lifetime. Most who understand nature and ions on a basic multiple subject range have a natural or 6th sense aptitude beyond books. Albert Einstein is an icon example of that and MIT level knowledge on up. A privileged society of savants.Derek did a very good job writing on such a subject. Cars cats and dogs account for most people in the USA. Yet few can answer 1 factual ionic basic basic minor question about them. Yes you need proper static balance in homes for physical and mental heath as do your pets. Open windows and get outside touching earth…dirt and grass ect. Adults 1hr a day, children 4 to 6hrs and thats minimum hrs every day. or best possible. A city boy knows not to fight a country boy, maybe 3 4 city boys or more, an old ion bred statement. Ionizer air cleaners work wonders and enjoy every extra day you can best you can. USA homes are a quagmire of chemical / mycotoxic pollution brought to you by ionic proton unbalance factors suspending dust and your lungs are like a dryer lint filter of sorts. Besides the ionic electron unbalance taking away your abilities on every scale and why people are fat or no common sense anymore and pills. 4 bucks Durk Pearson MIT genius used paper back Life Extension 1983 10mns a day is the best advice besides dust free home solutions and free from me no schooling ever taught you or search engine. The above is a brief ETSE theory based on a nano scale. Einstein’s greatest. Einstein’s Theory of Simplicity of Explanation. The greatest teaching theory of modern times. I am just a fan and we all owe our life to him for what we have. Wishing everyone well.

    • Thanks for sharing your thoughts, James. Appreciate your feedback and additions to the conversion!

  11. I have a portable air quality monitor that I carry on my backpack and every time I get into my car I get warnings about the dangerously low air quality. I want to buy an air purifier for the car and was particularly interested in the Hompo Car Air Purifier:

    Can you tell from the specs if it’s safe? Alternately, can you recommend a safe and effective air purifier?


    • Nothing in the specs is a red flag to me. It should be perfectly safe.

      What you want to avoid are air purifiers / cleaners that are marketed as an “ozone generator” those are dangerous for people to be around.

      The the vast majority of ionizers on the market, especially in countries with good safety / product standards, are perfectly safe to use.

  12. Hello Derek,

    Was also looking to purchase the REME Halo LED. It is made by RGF Environmental Group Inc. Their website states they manufactures over 500 environmental products and has a 35+ year history of providing the world with the safest air, water and food without the use of chemicals.

    REME stands for Reflective Electro Magnetic Energy. They state it uses UV technology and the Ceramic Catalysts and produces hydrogen peroxide.

    It is a bi polar ionizer but they claim it is “Zero Ozone Compliant” (<0.02 ppm)

    Would this be okay to use all day in the house everyday in terms of this ozone level? Is this safe enough to use? Is this similar to the Ozone levels being outside? It will be installed in the duct work of the AC unit and we have the AC unit on everyday.

    Also if the charge off makes particles stick together and larger for the air filter to capture that is good, but it is bad if we breath in the larger particles before they are captured by an air filter?

    Thank you so very much for your response!

    • If the ozone counts are that low then yes, it will probably be safe to use.

      According to the NASA / EPA, “In the troposphere near the Earth’s surface, the natural concentration of ozone is about 10 parts per billion (0.000001 percent). According to the Environmental Protection Agency, exposure to ozone levels of greater than 70 parts per billion for 8 hours or longer is unhealthy.”

      I haven’t tested this model, but from the specs page it does look really impressive. This seems to be a scaled down commercial style purifier, so that’s a good sign.

      When an ionized particle comes into contact with a floating particulate it changes the charge / weight and falls to the ground. So you won’t breath those in.

  13. Are you familiar with idf filter? I recently bought Honeywell Air genius 5 and it has an idf filter which is permanent and washable. Is idf safe and does not emit harmful ozone?

    • Hi Jon,

      I’m not familiar with IDF filters (very little info online that I can find).

      However, I don’t believe they would be harmful. Also, the filter itself would not emit ozone.

      Ozone is generated by purifiers that create ionized particles. The more energy behind those particles, the more ozone created.

  14. Hi, I am searching for air purifier safe for people with lung disorders. I thought about Reme Halo, a whole house air purification unit that also works on germs & virus etc. They advertise about hydro-peroxide indoor air quality. Wished you could offer any information or opinion; and or add to your research.

    • Any HEPA air purifier is going to be the safest option. I would suggest you avoid any type of ionizer.

      Whole home systems can be great, but of course they are more expensive. In either case, I would stick with a HEPA purifier system (whether it’s a standalone unit or whole home).

  15. Hi,
    I have the Airthereal APH260 Air Purifier, what do you think of that one? It has an ionizer you can turn on and off, and a UV sanitizer you can also turn on and off. Is it safe to use the UV all the time? Is it a good strategy to run it all day, but use the ionizer and/or UV sanitizer maybe once during the day for a short time, or on and off to ensure there’s no excessive ozone production? Also, there is a good H13 HEPA air purifier, the Medify MA-25, high CADR, but H13 HEPA filter only, no bells and whistles, just a straight up high filtration rate unit. Between that, and the Airthereal APH260 with ionizer/UV but lower CADR, which would be better for general air cleaning, and also for cleaning the air of mold? Thanks!

    • Just took a look at it on Amazon.

      They don’t even mention the ionizer in their product description, which makes me think that it’s probably not very effective.

      UV sanitizers are good and based on valid tech, however, it’s only going to sanitize the surfaces that it touches. You cannot UV sanitize air particles. For UV to work it has to be bright enough / constant enough on a surface that it can take effect. As for UV safety, it should be fine as it’s not coming into contact with your person.

      Since I don’t see any info on the ionizer I don’t want to say one way or another if it’s safe to use all the time. As far as UV goes, yes, that’s fine to leave it on all the time. There are not safety concerns with the UV light because it’s internal on the machine.

      I haven’t tested this Airthereal model, so I don’t want to compare it to a traditional high function HEPA purifiers. That said, in my experience, the vast majority of air purification power comes from the air flow of the unit and HEPA filter. I won’t go as far as to say that UV light and ionizers have no impact, but their impact is far less, in my opinion.

      High volume HEPA air purifiers are still used by hospitals for one simple reason…they work.

  16. Thank you for this thread. I used to own 4- XJ 2000 ionizers and used them for years. The brand I used was microtec and i see different companies make them but the unit is the same. After using them for some time, they stopped working and I either threw them out or stored them away. I did see the benefits with my family as I have two sons who were borderline asthma. They are teenagers now and have outgrown their asthma. I found one of my old ionizers and took it apart and cleaned it inside and out and I got it to work again. I started using it again in our bedroom and started to read comments here and other websites. I have been looking for a couple more but it looks like no one stocks these models anymore. I see the concern how some folks have issues with ozone and now I am thinking maybe I shouldn’t use it anymore. I figured its small enough, but it does give a clean smell which I can notice. I have a 2000 sf home and I only have it in our bedroom and I don’t think I am exposing too much ozone. Any additional advice or knowledge you can share on the subject? Thanks again.

    • Best advice I can give…if you think there is any reasonable chance that the machine is creating any significant volume of ozone you should stop using it.

      The benefits vs. risks just don’t make sense.

  17. Hi,
    what do you think about NCCO technology? I searched a lot but I’m not able to say if it releases ozone or other pollutants

    • If it’s similar to other catalyst oxidation systems I’ve tested I would say it’s good, not great. The other systems I’ve tested in the past weren’t able to achieve particle counts as low as standard HEPA air purifiers, while also costing more.

      They aren’t bad by any stretch, just not quite as good as others.

  18. Hi,

    Thank you for your article which helps me understand more before buying air purifier. Just some questions, is air purifier with negative ion of 20 million/cm3 safe to use?

    Can you look also into UV Care brand?

    • It’s not the quantity of the ions, but the energy behind them. More energy = more ozone = greater danger (unless there is an ozone suppression system, which is rare and expensive).

      Thanks for your suggestion on the UV Care brand. We’ll add that to our research / test list.

  19. I have an older Bell and Howell ionizer. I love the fresh smell in my bedroom but I guess that is from ozone so I should get rid of it to be safe?

    • I don’t know much about that specific model, Dawn, so I cannot say for sure.

      But the machine does look very similar to the Sharper Image Ionic Breeze that put Sharper Image out of business (due to the lawsuits).

  20. Can you suggest a good brand to use? I would like to have something that is safe, effective but also easy on the budget. Thanks.

    • Unfortunately, there is no standalone ionizer I would recommend that is safe, effective, and budget friendly.

      If it’s safe / budget friendly, it’s ineffective. If it’s effective / budget friendly, then it’s not safe.

      The problem is that in order for an ionizer to be highly effective it needs to create high energy particles. If it’s creating high energy particles then it’s also creating ozone. And breathing ozone is dangerous to humans in these types of quantities. A machine that creates high energy ions needs to also have an ozone suppression system, a feature you don’t see often outside of commercial units.

      Regarding the ionizers you see as part of air purifiers, those are safe, but they don’t create high energy ions. So they really cannot get very far out into the room (more energy = more distance = more ozone created). I wouldn’t go as far as to say they are without value, but most of the purification on those machines is still being handled via the HEPA air purifier. The percentage of purification coming from the ionizer is minimal, in my view.

  21. Hey! Have you tested the Blaupunkt ADH501? It’s a dehumidifier with built in Ionizator. I’m wondering could it be leaking ozone, it has both an active carbon filter and the ionisation. I’ve used it for a few months and since my house was very humid before, it seems to have helped on that account, but I’m still doubtiong the ionization function on it.

    • Unfortunately, I have not yet tested that model.

      When you create high energy ion particles that is what creates ozone. So if the ionizer is broken then it’s not creating any ozone.

  22. Hi, I am researching the “air genie”
    Model: PNP-130
    Anion Power: <1W
    Anion Output:
    From Breathe Greene Co.

    I am having a horrible time getting any testing information. Marketing and Opinion Reviews don’t count; I am looking for facts, testing, meeting USA regulatory compliance etc.
    Any information is greatly appreciated!

    • Hi Debi,

      Unfortunately, I’m not familiar with the Air Genie and we have not yet tested it.

      I took a look at their product page and see they are marketing it as an “ozone purifier”. That to me is a red flag. Ozone purifiers are not safe to use unless you are not in the room while it’s purifying. Even then, it needs time to disperse the ozone after generation.

      I would suggest you consider other products.

  23. Hi, I just learned about one called the Ritello by Librex. They did a demo and looked very impressive, and since they claim the water does the filtering, you don’t have to replace expensive filters, so they give you 21 year warranty. I have found little to no reviews on it, and I’m wondering if you have experience with it or know about it. Has ionizer and UV as well as a small back-up HEPA filter and is medical grade. Would love your input. Thanks.

    • Unfortunately, I’m not familiar with that model. So I cannot really for sure.

      Sorry that I cannot be more help.

  24. I recently bought an ionized air purifier with a HEPA filter and it’s begun producing a sweet smell, almost like baked goods. I’ve done some “googling” and have come up with mixed results about the ozone it could be producing. Some sites saying it’s leaking and I should get rid of it and evacuate and other sites saying it’s a manufacturer problem. Is it still safe to use? How can I get rid of the sweet smell it’s producing? Thank you.

    • What model is it?

      It could be leaking ozone, but I don’t think the sweet smell is ozone. Most people describe the smell of ozone as closer to chlorine.

      As far its safety, you should contact the manufacturer immediately. Ozone or not, that’s an abnormality.

  25. 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.”

  26. 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.

  27. 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.

  28. 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 –

  29. 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.

    • Hi, just to clarify your answer to someone else’s question earlier. I have the option to switch the ionizer on/off, but you recommend we leave the ionizer on when the air purifier is in use, otherwise the purifier is a lot less effective? The model is ‘BONECO P340’. Also can you tell me how to test the PM2.5? Many thanks, keep well 🙂

    • I wouldn’t go as far to say that ionizers on air purifiers are not effective. However, they respective portion of air purification is small compared to what the fan / HEPA filter accomplish on their own.

      For an ionizer to be really effective it needs to generate high energy particles. If it’s generating high energy particles that means it’s also generating lots of ozone. If it generates lots of ozone it’s not safe, which is why you don’t see those types of machines sold much any more. If they are sold, they are done with lots of warnings to make sure you’re not in the room while it’s in use.

      So to answer your question…you can leave the ionizer off without dramatically negatively impacting overall performance.

      As for checking PM2.5, you’d need a test meter. Something like this – – this is what we use to test.

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