Best Negative Ion Generators in 2021 | Home Air Ionizer Reviews

Ionbox portable ionizerIf you are looking for a powerful ionizer without ozone, this page has the top high-density negative ionizers currently for sale and why they are recommended.

Keep in mind that these are true corona discharge air ionizers with no ozone output.

Most negative ion generator reviews list devices that use primarily ozone, rather than ions, to clean the air.

The difference is very important to understand before you invest in one of these ion machines for your home.

Negative Ions Vs Ozone

While ozone emitters are good for eliminating odors and airborne pathogens, they are unsafe for extended periods of use near where you work or sleep.

Ozone is reactive and unstable and if you can smell it (a faint bleach-like odor), then you shouldn’t be breathing it in for too long. At high concentrations this gas can be a lung irritant and is considered dangerous to asthmatics.

Negative ions on the other hand, like the air at the beach, are exceptionally healthy to breathe in. And, at the levels generated by the ionizers reviewed ahead, will quickly and effectively clear indoor air pollution, without the health risks of ozone.
Picture of the Ionboxproduct on desk

How to Choose a Safe Ionizer for Your Home

If you want a real high-density negative ionizer, rather than an ozone generating ‘ionic air cleaner’, look for the manufacturer to clearly state the ion output. This will be in per cubic centimeter per second (pcs/cc) and the higher the better.

If a device is labeled ‘ionic’ or ‘anion’,  yet doesn’t list the amount of ions produced then be careful. It’s likely that ozone generation, rather than negative ion production, is the primary air cleaning method.

Good manufacturers will highlight their high ion output and show tests to confirm that they don’t produce ozone (or well under the safe 0.05 ppm EPA limit). If they don’t, then consider them suspect.

Home ionizers will also be very cheap to run. There are no filters to change and they require little electricity, even when left on all day, as many users like myself do to maintain constant air purification.

Now that you know what to look for, here’s a review of the best negative ion generators in 2021.

Best Ionizer with USB — IonBox

The small and portable ionizer market has a clear leader in the stylish and powerful IonBox available here at the lowest price. There’s simply nothing like it on the market.

It’s small enough to fit in the palm of your hand, yet generates an impressive 20 million negatively-charged ions per cubic centimeter per second.

That’s far more than any similar sized competitors I could find with my research (most of which are primarily ozone generators, not ionizers).

Negative ion emitter

IonPacific, the manufacturers of IonBox, claim it is capable of quickly removing cigarette smoke, airborne bacteria, pet dander, pollen and other allergens from the air you breathe.

They also say it delivers its air cleaning ions in an area up to 500 sq feet, without producing detectable ozone and has a 1 year warranty.

Pros and Features

There are two features I particularly like about the IonBox home ionizer. The first is that there are no replacement parts ever needed, unlike HEPA-based air filters.

And the second is that this unit can connect not only to a regular power socket, but also to a USB port on your PC, laptop or even in modern cars. That, along with its compact size, makes it easy to take with you anywhere.

It’s also very energy efficient, using a minimal 1.5 watts of electricity. You could easily keep this on your work desk all day to counteract positive ions from electrical equipment with hardly any power consumption.

Other good positions for it would be in the bedroom, kitchen to eliminate smoke and cooking smells, and in the lounge room, near where you watch TV.

The IonBox is also great as a travel air ionizer due to its lightweight and small portable design. Some reviewers recommend several of these little air purifiers as they are so useful in different environments.


If you are looking for the best portable ionizer in a small size, yet with a high ion output and no ozone, it’s hard to go past the IonBox by IonPacific.

Check the price and see customer reviews here to see if the IonBox is the right one for your home.

Top USA Made Air Ionizer — Vortex VI-3500

Anion generatorDon’t be fooled by its small size. This new Vortex VI-3500 model is an exceptional negative ion generating air cleaner.

It is made in the USA by ionization pioneers and innovators Wein, who hold several patents related to this technology, and have been making home ionizers for decades.

This deceptively powerful little air purifier ionizer produces an incredible 3.4 trillion ions per second using a unique ion generation method called ‘vortex wave’.

Vortex Wave Technology

The Vl-3500 produces such an unusually high ion reading by electronically pulsing tiny charges along a special corkscrew shaped ion emitter. Wein says this process creates ‘vortex waves’ of ions, swirling away from the unit at a rate of 150 feet per minute.

The pulsing ionization also stimulates airflow and draws airborne pollutants, like dust, pet dander, pollen, bacteria, viruses, cigarette smoke, volatile organic compounds, dust mite waste products and toxic mold spores, towards the device.

With millions of anions electrostatically attaching to these microscopic contaminants, they become too heavy to float and drop to the ionizer’s collection pad or fall to the nearest surface for vacuuming.

Pros and Features

Wein state on the VI-3500 packaging that their new ionic air purifier will remove 95% of particulate matter (PM2.5) indoor air pollution in 30 to 120 minutes.

They also list room coverage as 800 square ft and enough to clean the air of particles as small as .01 microns in a large 40 ft by 20 ft living room for instance.

At the same time, due to its unique design, the Vortex VI-3500 room purifier creates no detectable ozone and has been tested to be well below the OSHA standard of 0.1 part of ozone per million parts of air.

Despite its power, this negative ion machine runs on less than 4 watts of power, making it extremely energy-efficient. Even left on to clean the air in your home 24/7, it will use very little electricity compared to most other appliances. High Powered Ionizer

Another unexpected benefit of this air purifier is the ionic breeze it generates, with reviewers commenting that the air feels cooler, fresher and much cleaner to breathe.

Some Vortex owners describe it as being like breathing the air beside a waterfall or at the beach. This is unsurprising as ocean waves and waterfalls are two of Nature’s greatest negatively charged ion producers.


For best results, position the Vortex VI-3500 on a table, shelf or some other elevated position at least 3 feet away from walls and other electrical equipment like TVs and computers.

Also, keep in mind that whenever you wipe down the collection plate to clean it, which is recommended every week or two, it’s best to switch it off first to avoid getting a mild electrical shock.


These simple precautions shouldn’t be any reason not to own this amazing little ionic air cleaner. The volume of beneficial ions the VI-3500 produces for its price is truly amazing.

You can check the price and see more specifications and pictures here for the new 2021 Vortex VI-3500 ionizer machine, made in the USA by Wein.

Best High Density Corona Discharge Negative Ion Generator — Twin Air Pro

Ion Machine for HomeIf the primary feature you are looking for in an ionizing air cleaner is extremely high negative ion output, it’s hard to go past the superior Twin Air Pro available here.

This powerful room ionizer generates trillions of anions each second from its 22 ion emitting points, arranged across both tower heads of the distinctive silver design.

Pros and Features

Ion counter testing, measured at 12 inches away from the Twin Air Pro, shows it flooding the surrounding air with at least 200 million negatively charged ions per cubic centimeter.

This is an incredibly high reading, usually only seen in commercial hospital ionizers, and highly beneficial for removing airborne viruses, bacteria and other pollutants from the air you breathe.

At the same time, this ionizing air purifier has an extremely low ozone output that has been confirmed by testing as undetectable at 10 inches away. It also produces no harmful positive ions, unlike some cheaper models on the market.

The Twin Air ionizer runs on just 12W of power, making it very energy efficient compared to ionic air purifiers with fan-powered HEPA filters.

This ion machine is also usually extremely quiet to run. While you may hear some faint clicking when it is first switched on in a polluted room, this should stop after a short time of ionizing the air to remove floating pollutants.

Ion Generation Without Ozone

Unlike some other ionic air cleaners, there is no faint bleach-like smell emitting from the Twin Air. That odor is in fact produced by reactive ozone and can be dangerous in high quantities.

NaturAir, the manufacturers of the Twin Air Pro, have the tests to prove that it do not produce detectable amounts of this hazardous gas at 10 inches from the unit.

This is particularly important for asthma sufferers, young children and those with respiratory illnesses who are more susceptible to lung irritation from ozone.

A high ionic count in the air, on the other hand, is highly beneficial for asthmatics, people affected by seasonal allergies, and those sensitive to dust mites, mold spores, pet dander and other indoor air pollutants.Negative ion machines


One factor to keep in mind when buying this room ionizer is placement. For best results position it in an elevated position, at least 3 feet from a wall and well away from other electronic equipment.

Be aware as well that you may get a mild static shock if you touch it while it’s on. When cleaning the Twin Air Pro, as is recommended every couple of weeks, it’s best to switch it off first for this reason.


The NaturAir Twin Air Pro is my pick for the best high density corona discharge ionizer on the market in 2021. It’s specifically designed to flood the air with billions of purifying ions without generating ozone.

You can check the price here for the high powered Twin Air Pro with free USA delivery.

Negative Ion Generation for Your Home

After many hours of research, reading technical specifications and contacting manufacturers, these are the only 3 air ionizing machines I can recommend in 2021. Each of them are both ozone-safe and true high density negative ionizers.

I hope this review of the best air ionizers has helped you find the right one for your home so you can start enjoying the many benefits of negative ions.

Please share it with friends who might be interested in where to find real negative ion generators and what to avoid when looking to buy one.

There’s a lot of badly designed ‘ionic air cleaners’ out there that mainly rely on ozone, instead of beneficial negative ions, and may actually be doing more harm than good, particularly to children.

If you’d like to take the air purifying effects of negatively charged ions with you when you drive then consider one of these ionizers for cars.

I’ve also recently completed a comprehensive look at the best ionic air purifiers here that actually produce significant negative ions.

If you are looking to clean the air in a larger living space, whilst still receiving beneficial ions in the air you breathe, it would be well worth reading this article as well.

Negative Ionizer Guides | Air Purifier Reviews | Salt Lamp Information | Back to the Homepage

This article may contain affiliate links to products I've researched and recommend. As an Amazon Associate I may earn from qualifying purchases at no cost to the consumer.