Do Air Purifiers Produce Radiation? – Facts Vs Myths

Sadly, it appears there’s some false information being presented as the truth when in fact it’s nonsense! As both an engineer and an air purifier owner and reviewer I wanted to bust the myths once and for all.

Do air purifiers give off radiation? You’ll find out the truth here based on the scientific facts, not rumors or superstition.

Read on to learn more. There’s a lot to see!

Infographic – Air purifier & EMF facts

Infographic for air purifier radiation facts and myths

Fast facts: Do air purifiers emit harmful radiation?

Air purifier EMF radiation fast facts to know
  • Do air purifiers give off radiation? Air purifiers produce a safe & small amount of electromagnetic field (EMF) radiation. There is no data supporting the claims that they’re harmful. Any such claims have no basis in scientific fact.
  • A 2002 study published by the World Health Organization (WHO) International Agency for Research on Cancer found no evidence of cancer caused by low-frequency electric & magnetic fields.
  • What is EMF? Electromagnetic field radiation (EMF) describes the magnetic & electrostatic fields produced by the movement of electrical current in a conductor and devices. They’re also a by-product of electric motors such as in fans as they need magnetic fields to create motion & do work.
  • Common household, automotive, and workplace electronics produce similar or more EMF than air purifiers. In fact, industrial workplaces often power machinery that create hundreds or thousands of times greater electromagnetic fields due to the huge electrical current moving through them.
  • Household electronics have not been scientifically proven to cause harm in humans. However, higher-energy (higher frequency, such as radio frequency (RF) and higher power) sources like cell phones have been shown to cause harm in lab rats under extended use.
  • Most air purifiers use relatively low power (55W or less, typically) and use a household low-frequency 60Hz 120V power source which is “chopped up” to control the purifier’s fan speed. They don’t use a high-frequency design in most cases.
  • The power of magnetic fields drops dramatically the further away you are from them. In fact, at only a few feet or meters away they’re a fraction of what can be measured right in front of the source. Most people aren’t immediately next to EMF sources, meaning there’s little that reaches them.

When someone claims something that millions of people own is supposedly harmful, shouldn’t they be able to back it up with scientific facts?

In this article I’ll explain:

  • What the hype is all about
  • What EMF radiation is and where it comes from
  • Scientific facts and why it’s much ado about nothing
  • More things to know that matter
Note: In this article, I’ll be referring to HEPA-based air purifiers, not ionizers or ozone generators sold as purifiers. Those are a completely different type and I don’t recommend them (you can read why here in this detailed article).

The misinformation being spread – What does it mean?

Drawing showing example of a claim made about air purifier radiation

An example from a website providing misleading information about air purifiers. The main concern I’ve heard from readers is that they’re reading that they produce harmful radiation – causing them to become worried when in fact there’s no need to be.

Some time ago I first heard from a reader and more recently I’ve gotten more comments and questions about this topic. In product reviews and in other places, they’re reading statements claiming (or implying) that air purifiers are potentially harmful to your health due to “radiation.

You’ll notice people making this claim don’t provide evidence or cite studies by reputable organizations to back it up. Also, they may incorrectly refer to magnetic field “limits” or by measuring a product and finding a supposedly high reading with unproven test equipment and not with a controlled & proper scientific test.

You shouldn’t base your decisions on random strangers on the internet who aren’t qualified to make these (incorrect) claims – but instead on facts and what science actually says!

There’s a huge difference between a person at home taking measurements vs a proper study done under controlled conditions and correct test procedures. After all, isn’t that what scientists and labs are for?

That’s why I wrote this article – so you won’t be misled into believing false claims and won’t avoid buying air purifiers based on that.

What is this “radiation” that people are talking about?

When the word “radiation” is used here when we’re talking about air purifiers. We’re not referring to nuclear radiation.

The word “radiation” normally refers to materials that give off radioactive particles like uranium and other radioactive materials that can result in extreme environmental and health problems in both humans and animals.

Instead, we’re referring to electromagnetic fields that are radiated (EMF).

What is EMF radiation? Where does it come from?

EMF radiation field conductor and motor windings diagram

Magnetic and electrostatic fields are created when electrons flow through an electrical conductor. The strength of the fields depends on the amount of electrical current and other factors. Motors like those to drive a ceiling fan, motors in your car, and inside an air purifier use magnetic fields to create motion that allows the fan to move air.

I’ll spare you the very complicated (and boring) physics of it all. Believe me when I say my electromagnetics class was one of the single most difficult engineering classes I had in college!

Don’t worry, though – the basic idea isn’t that hard to understand.

Just saying “radiation” actually isn’t the right description – it can give people the wrong idea and lead to confusion or misunderstanding.

After all, we’re talking about electricity and air purifiers, not nuclear materials for heaven’s sake!

How electromagnetic fields (EMF) are produced and what they do

When the electrical current (electrons, as you might recall from science class) flows through a conductor like a wire, 2 types of fields are produced:

  • Electrostatic fields
  • Electromagnetic fields

Electrostatic fields are a type that acts as a voltage potential in the air because of an electrical charge, much as static electricity does. In a similar way, electromagnetic fields are created too, and radiate, or move outward, a lot like how a magnet produces its magnetic fields.

As we all know magnetic fields attract objects. They also can create the movement of electrons (called induction) in nearby metals. 

When we talk about radiation, we’re simply talking about the fields that ALL electrical and electronic devices – not just air purifiers – produce.

The strength of these fields is commonly measured in units called Gauss or Tesla, named after the early scientists who pioneered the understanding we have of them today.

Magnetic fields are critical for the things we use

Electric motors like those that turn a fan to blow air for cooling your room or cleaning the air need magnetic fields to create motion. To do that, electric motors use a huge length of wire windings.

When a long length of wire is wound into a coil or winding like in a motor, the magnetic fields  “build up” and are much stronger. That, and the electrical current flowing in them, create the fields.

The thing is that unless they’re very strong they can’t affect objects or humans or animals nearby. It takes an enormous amount of power to create EMF that is any concern – way beyond anything you’ll get from your electronics, appliances, and an air purifier or fan.

Diagram showing magnetic field strength vs distance

Magnetic and electrostatic field strength drops significantly with distance. Even a few feet or meter away the fields reaching you (as who stands right in front of electronics?) are much weaker than right next to the source.

Another very important thing to know is that these fields are much weaker further away from them – meaning you’re almost never exposed to their full strength, which again is typically very small (a few thousandths of a Gauss (milliGauss).

That’s why radio and television stations, for example, use thousands and even hundreds of thousands of watts of power. It takes an enormous amount of power to get a good high-frequency radio or TV signal to an antenna in your home over a long distance.

The appliances and machines in your home and workplace generate only a fairly small amount in most cases.

How air purifiers work (and where the EMF comes from)

Illustrated image showing the fan motor and parts for Levoit LV-H132 air purifier

Shown: The main components of a Levoit LV-H132 purifier. Air purifiers use a power source and control an electric fan motor in order to move dirty air through the filters to clean it. Most use alternating current (AC) from a wall outlet in your home and “chop it up” with control electronics. This allows running the fan at different speeds and more efficiently, too. (Note the yellow section in which the motor’s wire windings are)

Ever heard of a direct current (DC) motor? You might remember them from battery powered toys or some of the science experiment kits you played with as a kid. While they’re good for some things, alternating current (AC), which is what is supplied to your home from the power company is used instead.

But why? There are several good reasons AC motors are used in nearly all appliances and electric fans, but mainly it’s because of their increased power output and efficiency.

How an air purifier fan motor works

(Click to enlarge)Diagram showing how an air purifier electric motor works

Air purifiers use an electric motor, powered by alternating current (AC) in most cases, to turn a fan and move & clean air. An electronic board regulates how much power is applied to the fan to allow different fan speeds. Both the motor and the operation generate EMF fields around it (as do other devices too).

Most air purifiers use standard AC power connected to an electronic motor control board and the fan speed switch (or button). The low-frequency AC is “chopped up” and modified by a pulse width modulation (PWM) electronics circuit board to control how voltage is applied to the motor.

This is how we’re able to get different tightly regulated fan speeds without wasting power as was done with products back in the old days.

The PWM motor control board isn’t a high-frequency controller like you’d find with radio or cell phone signals. Instead, it’s a lower-frequency design that works several thousand times per second typically. This frequency range is called “kiloHertz” (kHz).

Since the fan motor uses a lot of tightly wound wire as coils and also the fast pulsing of the power supply, EMF is generated anytime the purifier is turned on. Note that the amount of EMF changes based on the amount of power being drawn (electrical current required).

However, most air purifiers draw only about 12-55W watts based on my measurements & the fan speed chosen, so they create a small amount of EMF. 

Many appliances and machines draw a lot more power and generate more EMF.

The scientific truth about it all

There is inadequate evidence in humans for the carcinogenicity of extremely low frequency magnetic fields in relation to all other cancers.
There is inadequate evidence in humans for the carcinogenicity of static electric
or magnetic fields and extremely low-frequency electric fields.
There is inadequate evidence in experimental animals for the carcinogenicity of
extremely low-frequency magnetic fields.
No data relevant to the carcinogenicity of static electric or magnetic fields and
extremely low-frequency electric fields in experimental animals were available.2002 World Health Organization IARC study findings

What people who make claims about air purifiers (or any other small, typical source of EMF) aren’t telling is that for decades no scientific test has proven any proven harm from exposure to low levels of low-frequency EMF like air purifiers produce.

A 2002 study from the World Health Organizations’s International Agency for Research On Cancer found that there was no evidence of physical harm or cancer in humans or animals under study.

In fact, even much larger amounts like from current-hungry industrial machines haven’t been proven to cause any harm to humans, either.

The simple facts are the following:

  • Scientists disagree regarding the conclusion that EMF can cause cancer, for example.
  • There are no studies that have ever found definitive proof of harm (aside from an exception, see below).
  • You’re likely to be harmed by high levels (high frequency, higher power), if at all possible, and certainly not weak devices like an air purifier.
  • The EMF from an air purifier or other electrical devices drops drastically the further away you go – so your exposure is even smaller.

It’s important to be realistic – you can’t avoid EMF totally.

There’s an important point I need to make here before we continue: the EMF given off by air purifiers is no different (and even less than) sources you’ve been around already for years.

Here are some examples:

  • The blower fan in your car or truck (the dashboard fan that blows air through the vents)
  • Ceiling fans and other cooling fans
  • Certain types of light fixtures and heaters
  • Many appliances
  • Machinery in your workplace (industrial machines, in particular, can be a big source of high EMF levels)
  • Radio and cell phone high-frequency waves

The truth is that you’re surrounded by EMF everywhere. However, exposure to certain kinds of EMF may be potentially harmful, as you’ll see below.

What EMF radiation types have been proven to be harmful?

There has, in fact, been demonstrated evidence by the National Toxicology Program in the testing of abnormalities in lab rats caused by heavy cell 2G & 3G phone exposure. An increase in DNA damage along with the growth of malignant tumors was discovered in the mice & rats under test.

Additionally, the IARC has also concluded that radiofrequency & microwave EMF fields may possibly be carcinogenic.

Unlike air purifiers and other standard appliances or products around, this doesn’t refer to low-frequency fields but high frequency. Examples of that are signals in the millions of cycles per second (Megahertz [MHz]) and billions of cycles per second (gigahertz [GHz]).

This includes various devices like radio broadcasters, radio & communications towers, and wireless cell phone use.

In summary: the main facts to know

Image of finding the word facts under a magnifying glass

In summary, there’s no truth to the hype about air purifiers generating “unhealthy levels of EMF.” It simply isn’t true, there’s no proof to the claim, and it also ignores several important facts (while providing no proof).

In other words, it’s nonsense.

Here are the main facts to take away after reading:

  • There’s no scientific basis to the claim that air purifiers produce potentially harmful EMF. In fact, scientific studies have proven otherwise (see cited paper above).
  • Air purifiers (and many other devices) do produce some EMF, however, these are (1) generally small levels that (2) dramatically decrease in strength the further away you are.
  • You’re surrounded by EMF from many sources, and from the same type of EMF that air purifiers create: in your home, your car, and in the workplace. It’s nothing new.
  • Air purifiers produce low-frequency EMF, not the high-frequency/high-power type that has been suspected to create cancer in scientific tests (RF, wireless phones, and other types with high exposure).
  • If you see a recommendation that you “should” by a DC motor air purifier, you’re being misled. Not only is it not necessary, but very few high-quality purifiers use a DC motor. The best models use an AC design.

Hopefully this helps clear up the confusion and will help avoid being influenced negatively. Air purifiers are a great way to improve your quality of life, your comfort, and even stay healthy. 

HEPA filter purifiers are used by millions of happy owners every day and are a safe and effective way to clean your air.

Grant Williams

About the author

Grant is a professional engineer by trade and has experience with both maintenance and do-it-yourself home projects. He enjoys sharing his expertise & ideas with others to help them improve their comfort and quality of life. Read more »

Your comments are welcome!

  1. My husband is concerned about radiation that is accumulating in the carbon filters of the air purifiers in our home. What are your thoughts on this?

    • Hi Leigh. Radiation can’t really accumulate in objects unless you ingest it (example: the tragic story of the Radium Girls and radium paint). Is there some particular type of “radiation” you’re referring to?

      The only true radiation is from radioactive elements like uranium or radium, etc. Real radiation is the emission of radioactive particles from elements that emit it. That’s 100% nothing to do with air purifiers, but rather with things like atomic power and Chernobyl, for example. I think the terms are being confused and used misleadingly by people who want you to panic and freak out over nonsense.

      There is such as thing as electro-magnetic fields (EMF) produced by nearly everything that uses electrical power, and they do radiate, or move outwardly from the source, but that’s about it. Once power is removed, it’s completely gone. Electromagnetic fields can’t exist without a power source, and they can’t be “absorbed” or keep going once they’re gone, just like sound waves.

      Anyone who tries to tell you otherwise is either not understanding the science or (that these strange people on the internet I see) have some weird personal issues going on.

      If you read my article, the science so far supports my statement that HEPA air purifiers have zero health concerns. High-frequency cell phone bands, however, are a different story, but even then only under certain conditions so far.

      Air purifiers have nothing to do with actual harmful radiation and would never be sold if they did. The nonsensical hype over EMF, “radiation” and air purifiers is why I wrote this article.

  2. i have RF in 1//2 of my window to the middle frame. Also on the water pipe down celler for only a short distance in the vivacity the window. i am also getting all difference high pick sounds in my head– sharp pains and headaches, leg pains, extremely tied. light headed unstable only at my house. This happened after i had trouble with a tenant . Who can I get to find the problem. I am so tied of feeling sick.

    • Hello Shirley. So, my first question (in order to better understand your perspective) would be to ask how you arrived at the conclusion that you have RF in only certain areas in your home. The reason that I’m asking is that RF (electromagnetic radio frequency) waves reach our bodies from all directions as they’re all around us, not in only a few specific places.

      If you haven’t done so already you can get a high-quality EMF meter to measure where the most RF energy is located and use metal panels or screening to block it if you like or remove power from any appliances generating it.

      But you’ll also have to get rid of your cell phone if you have one as those have much more RF energy than most everything commonly around us save a few exceptions.

      I’m not going to disregard your symptoms but my sincere advice would be to have an examination from a doctor if you haven’t already to rule out other causes. RF isn’t normally a cause of physical symptoms although it can be in extreme cases.

      Best regards & have a good weekend.

    • Hi there. My apologies as somehow I didn’t get a notification of your comment.

      Ionizers don’t affect EMF and work using electrostatic fields (electrical fields basically, which aren’t the same as EMF). Best regards!

  3. One question I have that I am not sure you touched on in your article (very well written and detailed, great job) is what level of EMF is of no concern and at what levels one should start to question. For example, I am shopping around for a home air purifier and the one I keep looking back to is the exact model you show in your article, the Levoit H132. Some of the reviewers have left photos showing EMF readings between 100-350 mG. Have you done similar tests on your H132? These are my only concerns when looking at this particular unit to buy.

    • Hi Samo. To the best of my knowledge there’s not a definitive standard regarding the level (energy level and frequency) to use as a guideline. However, based on the test data I linked to in my article we can surmise for now that very high frequency, at very close range (very close to your body), and of a least several watts of broadcast energy can lead to some side effects.

      The people who cite EMF for air purifiers have no idea what they’re talking about and it doesn’t mean anything without 1) a calibrated test instrument, and 2) scientific data to back it up. They’re a bit paranoid as low-frequency power sources like an air purifier have a miniscule amount of EMF, if at all, which drops off dramatically the further you move away from it.

      In fact, if you own a cell phone, Bluetooth device, or use a Wifi modem/router they’re much higher in EMF energy. But it seems this irony is lost on the same people who make claims about air purifiers.

  4. Hi, very interesting read thank you. Is it safe to put air purifiers in a childs bedroom? you mention its safe if you are a few feet away but the bedrooms are small and I am worried about whether it would be a good choice to have them so close to them sleeping at night or not. It is a new home so there are lots of VOCs about. thanks


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