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Top Of The Best Air Ionizers Reviewed In 2018

Last Updated March 1, 2019
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Adrian HoffmanHi! My name is Reginald Meyer. After putting in 50+ hours of research and testing, I made a list of the best Air Ionizers of 2018 and explained their differences and advantages.

In this article, I will be categorizing the items according to their functions and most typical features. I hope that my Top 10 list will provide you great options in buying the right fit for you.



Feel free to explore the podium, click on the pictures to find out more.



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You must visit the page of sales. Here is the link. If you don’t care about which brand is better, then you can choose the Air Ionizers by the price and buy from the one who will offer the greatest discount.



№1 – PIONAIR 1500 Smart Pointe – 4 in 1 Whole Home Air Purifier with Photocatalysis, UV Sanitizer, Ozone, and Ionizer – Reduces Mold and VOCs including Formaldehyde – Made in USA

PIONAIR 1500 Smart Pointe - 4 in 1 Whole Home Air Purifier with Photocatalysis, UV Sanitizer, Ozone, and Ionizer - Reduces Mold and VOCs including Formaldehyde - Made in USA
PIONAIR 1500 SMART POINTE UNIT – Generates more negative ions to quickly remove allergens from the air leaving a clean scent. WHOLE HOME AIR PURIFIER – Extra Large Rooms from 750 to 1,500 sq ft
CLEANS ALLERGENS AND POLLUTANTS – Effectively CLEANS ALL 3 CLASSES OF INDOOR AIR POLLUTANTS – particulates (allergens), chemical vapors (VOCs) and microbes (dust mites and mold)


№2 – IonPacific ionNight, Portable Air Ionizer/Purifier Night Light with Filterless Negative Ion Generator – Ultra High Output at 3 Million Negative Ions/Sec, Eliminates: Pollutants, Allergens, Germs, Dust

IonPacific ionNight, Portable Air Ionizer/Purifier Night Light with Filterless Negative Ion Generator - Ultra High Output at 3 Million Negative Ions/Sec, Eliminates: Pollutants, Allergens, Germs, Dust
✔ HIGHEST QUALITY – Years of research by our US & UK engineers on negative ion technology has resulted in an air ionizer capable of emitting up to 3 million negative ions per second, eclipsing any other ionic generator on the market by a factor of 5. This breakthrough, patented negative ion technology provides you with cleaner, safer, and overall better air quality that your health deserves


№3 – OION B-1000 Permanent Filter Ionic Air Purifier Pro Ionizer with UV-C Sanitizer, New

OION B-1000 Permanent Filter Ionic Air Purifier Pro Ionizer with UV-C Sanitizer, New
SAVE MONEY AND THE ENVIRONMENT – With just 7.5W of ultra-low energy consumption and no costly filters to replace, the purifier is a bargain for you and the environment. Size: 17″(H) x 6″(W) x 7″(D)
Electrostatic Ionizer Purification – Negative ions (O1) remove airborne pollutants as small as .01 micron such as allergens, pollen, mold, smoke, pet dander, unpleasant odors, dust, and other airborne irritants.



Every air purification technology has its strengths and weaknesses. In which case, an air purifier that offers multiple technologies is generally best, in order to combine the advantages, and eliminate the disadvantages of each air purification method.


An air ionizer creates negative ions, which change the polarity of airborne particles, causing them to magnetically attract together. As a result, they become to large to remain airborne, and fall out of the air that you breathe in. The most effective ionizers use a stainless steel “needlepoint” to produce negative ions.

Air Ionizer Strengths

Removal of particles from the air, including ultra-fine particles as small as 0.0microns.

Neutralization of viruses, bacteria, cigarette smoke and chemical fumes.

Can circulate throughout the room to remove airborne particles that are across the room from where the air purifier sits.


Ultraviolet (UV) lamps effectively destroy micro-organisms that pass by the bulb, including germs, viruses, bacteria, and fungi (such as mold). UV Light radiation is recommended by the Centers of Disease Control to prevent illness and disease.

Ability to destroy micro-organisms, such as germs, viruses, bacteria, and fungi (including mold).


Ozone is a highly reactive oxidant that destroys certain bacteria and chemicals, including odor-causing bacteria and chemical agents. Ozone is highly effective against strong odors, but is not always needed or wanted under normal circumstances. In which case, it is best if it can be completely turned off if not desired.

Highly effective against odors, including cigarette smoke odors.

Can cause irritation of the eyes, nose, and throat if occurring in high enough concentrations.

Destruction of Micro-Organisms

Ozone and negative ions have some ability to destroy certain micro-organisms, but UV (ultraviolet) light is the most effective at destroying the greatest variety of micro-organisms. UV light destroys viruses, germs, bacteria, and fungi (such as mold) in order to help prevent illness and disease. The Surround Air “Multi-Tech” Air Purifier incorporates a UV lamp, ionizer, and ozone generator (which can be completely turned off) to team up against micro-organisms.

Filter Sanitization

Air filters serve as a breeding ground for micro-organisms. The fabrics within an air filter allow micro-organisms attached to trapped dust particles to reproduce and/or breed. In which case, it is imperative that an air purifier (such as a Hepa filter) have a sanitizing device located next to the filter. Otherwise, the growing populations of microbes will be circulated into the air. A UV lamp, ionizer, or ozone generator can be used for this purpose, although a germicidal UV lamp is most effective at destroying micro-organisms.

The UV lamp in the Surround Air “Multi-Tech” Air Purifier is placed directly behind the air filter cartridge, enabling it to thoroughly sanitize the air filter. The Multi-Tech also has an ozone generator located near the filter that can be activated for even added filter sanitization.

Room Air Purifiers

As the name implies, these devices are for purifying the air of a given room in the house. They are not appropriate for making the air in the whole house cleaner. These are also options to go for in house with no forced-air heating or cooling. This article focuses on this type of air purifiers as this is the more commonly used one and require no special features in the house (like forced-air heating/cooling).

Whole-House Air Filters

This type is ideal for those who already have forced-air heating and cooling system in their home. These are special filters that can be popped into the already existing device. It also needs to be replaced regularly for maximum efficiency. We will not elaborate more on this filter in this article.

There is a variety of manufacturers that make great air purifiers, which makes for good competition and the buyer thus benefits in the end.  Some of the brands worth mentioning are Winix, Airmega, GermGuardian and Honeywell.

Dirt sensor

This is something that not all models have. What this feature does is that the sensors built in the purifier can determine the level of dust in the air and the device will adjust the fan speed accordingly.

Talking about fan, this is one of the most important features of the best air purifiers. Only those devices perform well use a fan to circulate through the air. The cheaper ones don’t have a fan but use the natural circulation of air, so they generally perform poorly. Even though the ones equipped with a fan are a little louder, you should definitely go for one of them.

The smaller, lighter models usually come with a carrying handle that makes moving them easy. Some of the heavier ones which would be difficult to lift may have wheels.


Ionizers attract particles through a process similar to static electricity. If the model you choose has a built-in ionizer, it is great. It will surely increase the performance of the device. However, please be aware that certain ionizers may produce such ozone that is a possible lung irritant.

Programmable timer

Another feature like the remote control, no explanation needed here. Models that have a programmable timer make the user’s life more comfortable.

In the more advanced air purifiers you can adjust the speed. You can set it to a higher speed by day and to a lower one at night – this way you can also reduce the noise it makes when you go to bed.

There is no “things to consider” list without cost: both the purchase price plus the recurring costs.

Recurring costs: Here I have to mention two things: electricity and filters. This is an electric device which certainly means that it consumes energy. This shouldn’t be a surprise to anyone looking to buy an air purifier. The cost of filters is a different matter altogether. Many people don’t consider it before buying a purifier. The models that come with a HEPA  filter have the highest cost when it comes to filter replacement. The replacement of such filters can range anywhere from to up to 100 dollars depending on what model we are talking about. The bad news is You should definitely go for an air purifier with a HEPA filter as this is the best one, and Most HEPA filters need to be replaced on a yearly basis – so, it will mean a constant cost. If you want to reduce the yearly cost of maintaining your air purifier, you should consider buying an air purifier with a cleanable HEPA filter. There are some models available with this feature.

I have already touched on the importance of noise level in the “Features” part. I believe it is worth going into details to understand why it is important how much noise a specific device makes. Let’s consider that you will buy an air purifier that works with a built-in fan, which generates more noise compared to devices with no fan. As already mentioned better models come with adjustable speeds which makes noise control possible. Still, it may happen that the most silent mode of one device is still louder than another model. If you want to buy an air purifier for your bedroom, the noise level is definitely something to consider.

After going through what you should consider, let’s see which are the best devices overall.

Winix WAC9500 Ultimate Pet True HEPA Air Cleaner with PlasmaWave Technology


The list of strengths of this air purifier is extensive. Let’s see the most important ones. The 9500 uses a 5-stage filtration process to almost completely eliminate the hair, dander and odor of your pet.   This device definitely lives up to its “Ultimate Pet Air Cleaner” name.  It is not a big device compared to its power and how much air it can filter. You can carry it from one room to another with ease. One of the biggest advantages of this model is the washable pre-filter. It filters the bigger pieces of dust, pet hair etc. It means that a lot of these materials don’t even reach the HEPA filter. Why is it important? Simply because you want your HEPA filter to last as long as possible. They are not washable and when not usable anymore, they need to be replaced. They are expensive to replace so, believe me, you want that washable pre-filter.

Price is definitely one of the cons as this machine costs over 200 dollars. This is not cheap considering that most quality items cost anywhere between 100 and 200 dollars. However, I cannot mention anything else when it comes to the weaknesses of the Winix WAC9500 Ultimate Pet True HEPA Air Cleaner, other than how it looks. I don’t think it is a nice design, but that view of course is subjective. Keep in mind that it is built of quality materials and has all the functions and features that an air purifier may possibly have.

Air conditioners

A fan refreshes you by moving air around but air conditioners actually reduce the temperature by removing hot air. A compressor (the ‘engine’ of an air conditioner) draws hot air into the unit, over an evaporator which contains a low pressure, very cold refrigerant. Now cooled, the air is then blown out through the front vents while the heat is expelled through a 1-metre rear hose, which resembles a tumble drier hose.

Mobile air conditioners are best for the home as you can simply plug them into the mains socket. If you need to move them around the house it’s easy as they usually sit on castors. You need to make sure the hot air is extracted, along the hose, through a small hole in the wall. In the short term, however, you can direct the hose through the window or door.

Single units

These house the compressor, evaporator and refrigerant in one neat unit. There are types of single units: air-cooled or air- plus water-cooled. The latter offers you larger cooling power, but means you need to top up the water regularly.

Split systems

Larger units have a separate ‘condenser’ unit that you place outside. Though this might seem cumbersome, it means that the internal unit is often smaller and more discreet. The outside unit is fully weather-proof and the connecting hose is narrower.

Size of unit

How effective the unit is depends on several factors, the most important of which is room size. Consider other factors, however: the hotter the day, the more work the machine has to do; consider computer equipment and the number of people in a room – they give out heat as well.

Cooling power is measured in Watts or BTUs/h (British Thermal Units). The rule of thumb is roughly 40W per cubit metre or BTUs per cubic foot, to cool a room. 10,000BTUs approximates to 3kW. For example, a 10,000BTU unit will normally cool a room approximately 24m², though manufacturers’ models vary. If the room is large you might find it best to buy units.

Air purifiers and ionisers

Refresh the air in your home and enjoy a more invigorating atmosphere using these air purifiers and ionisers. Air purifiers work by drawing in air through a filter to remove impurities and odours, offering you fresh air in your environment. Air ionisers are slightly different, releasing negatively-charged molecules into the air to create a more stimulating tone much like the feeling after a heavy thunderstorm.

Air purifiers are designed to reduce the dust particles, smoke, pollen and bacteria you find indoors. Our homes can be more polluted than outdoors, and if they’re well insulated you may need to do more than simply open all the windows and doors – especially if you live in a city. They are particularly suitable for asthma or allergy sufferers, and work wonders after a heavy party! Some even have built-in ionisers.


The sensation of fresh mountain air or that invigorating feeling just after a thunderstorm is thanks to electrically-charged molecules called negative ions. Ionisers re-create this environment, cleaning the air in your home by releasing billions of negatively-charged ions that ‘wrap’ themselves around positive ions that are responsible for stale and polluted air, drawing them back into the ioniser. The result is a healthy, refreshing feeling.

Humidifiers and dehumidifiers

Ideally rooms should have a humidity level of between 40% and 60%, but as we spend so much time indoors with the windows closed, and air conditioners or the heating on, the humidity level can often be very low. Too low or too high and you may feel uncomfortable – and if you’re an asthma sufferer you may experience heightened symptoms.

And it’s not just you who suffers: furniture can dry up or crack, materials dry out, or in damp houses unsightly mildew or fungi may appear.

What to look for in a humidifier

Conversely, dehumidifiers work by drawing excess moisture out of the air. They are ideal for homes that suffer from damp or mildew. Some fully automatic models can be set to work when moisture levels reach a critical point, while others have a shut-off function that works when the tank has become too full.

British Allergy Foundation Seal of Approval

Look out for the seal of approval by the British Allergy Foundation. They scientifically test and measure products and endorse those that specifically restrict or remove high levels of named allergens from the environment.

What is an Air Purifier

If you’re looking at air purifiers online, you probably already have a good idea of what one is; essentially, it’s a device that purifies the air in your home by removing pollutants such as dust, allergens, and pollen. Some can even handle contaminants like smoke and other odors. Considering the sheer amount of time we spend indoors, an air purifier can make a large impact on your health in your health if you suffer from allergies, asthma or other breathing problems, and provide some welcome relief.

But with that said, there are about as many different air purifiers out there as there are needs for them, and to help you get a better understanding and handle of the many options available to you, we’ve put together a buying guide of some of the best options available today.


Many air purifiers come with multi-stage air purifiers, which provide multiple layers of filtering and choices for different purposes, such as filters for smoke or for allergens. Many will have a pre-filter, which blocks larger contaminants and particles before reaching the main HEPA filter, and helps extend its life. Others have filters coated in activated charcoal or carbon to further absorb odors – the Rabbitair MinusA2, for example, has different filter stages, and lets you pick from different custom filters such as Pet Allergy or Toxin Absorber. Remember to keep the cost of additional filters and maintenance in mind when choosing a model.

UV-C Light

Air purifiers with built-in UV-C lights are becoming more and more popular. UV-C lights help sanitize the air in your room by zapping it with UV rays, killing any germs or viruses that may be floating. While most models won’t have one of these, they are nice extra defense against illness.


Some air purifiers come with ionizers, which release negatively charged molecules into the air. These ions bind with pollutants in the air, making it easier for the filters to capture them, or are absorbed into the surfaces in your house. It’s not proven how well these work, and there is also a downside; ionizers create ozone, a toxic gas, that can further aggravate respiratory conditions.

Other Things to Keep in Mind

Most air purifiers will be relatively quiet – they are made for running continuously in your home, after all – but will make some noise, which you will want to be aware of, especially if you plan on using it in a bedroom. Most models have quiet modes for night time, and some even have automatic sensors.


Our follow-up to the Alen Breathesmart is the Rabbitair MinusA2, another powerful and modern air purifier with an effective area of 700 sq. feet and ACH of It has one of the best filter systems we’ve seen yet, with six different filters including a pre-filter, medium filter, BioGs filter (which prevents the buildup of mold and bacteria), Custom filter, a Charcoal-based, carbon-activated filter, and a negative ion filter. The custom filter lets you choose between Germ Defense, Toxin Absorber, Odor Remover and Pet Allergy filters, suiting it’s cleaning power to whatever you need most in your home. And as a true HEPA filter, it filters down to.0microns, removing 99.7% of contaminants in the air.

The MinusAis, like the Breathesmart, sleek, modern and attractive. While not as small as the Breathesmart, it is very thin, blends well into its surroundings, and even comes with a free wall mount kit for putting it neatly up on your wall. You can place it in your kitchen, living room, or bedroom, and the smart sensors automatically tone down the speed and lights at night. There are also childproof options, and it automatically shuts off should the front panel be removed while in use. Rabbitair also tosses in a 5-year warranty, which isn’t bad at all.

Overall, the MinusAis another high-quality, powerful and attractive option for an air purifier. Our only drawback is that it does not cover as much area as the Breathesmart (1100 vs 700 sq. ft), making the Breathesmart a better choice for the price.


The Levoit Pur13is a much more affordable option than the two we’ve already highlighted. It’s a true HEPA filter, with stages – Fine Preliminary, True HEPA and activated carbon. These work together to cover a decently large area of 32square feet – not nearly as large as the two above it, but that’s to be expected for its lower price. It has a CADR of 135+, and is 100% ozone free.

The Levoit has a few of the smart features lacking in cheaper models, such as Sleep Mode, which turns down the fan and noise for up to 1hours at night, and an automatic sensor that determines the quality of the air in your room and suggests a fan speed accordingly on the LED panel. Its external design isn’t quite as sleek as the Rabbitair or the Breathesmart, but is still attractive enough to fit in with your home or office without sticking out conspicuously.

It may not have the sheer power or coverage that more expensive air purifiers have, but the Levoit is an otherwise much more affordable, quality option for your home. It has all the necessary features at a good price, and very effectively cleans the air. Many reviewers have also emphasized how conservative the recommended filter replacement time is, and you can easily push it much longer.

Purezone 3-in-1

The Purezone 3-in-is an affordable air purifier is designed for smaller areas of up to 200 square feet – not quite the power and range of others (or even the Levoit Pur131), but more than enough for a large room or kitchen. In addition to the pure HEPA filter, which captures 99.7% of pollutants, it also has a pre-filter and an activated carbon filter, hence the name “3-in-1”. A 3-speed fan lets you choose how powerful you need it. In addition, it has a UV-C light to sanitize the air, destroying germs, fungi, and mold, but no ionizer, eliminating any worry about ozone in the air.

Like the GermGaurdian, it doesn’t have much in the way of fancy smart features, but it does have an automatic timer, which can be set to 2, or hours, as well as a filter reset light. What it lacks in features, though, it makes up for in price and convenience; it is small and easy to transport, and can be moved around from room to room as you need. It does its job, is very effective at removing dust and allergens, and Purezone also includes a 5-year warranty, so you never have to worry about potential problems or breakdowns.

Our last air purifier and our choice for Budget Buy is the GermGuardian AC482The GermGaurdian is a very basic and affordable air purifier, perfect for smaller rooms and houses. While it lacks the fancy features and power of some of the more expensive options on our list, it makes up for those with its affordable price tag. It has a CADR of 100, and can cover up to 15square feet. There is a pre-filter, for capturing large particles, and a charcoal filter for absorbing odors. It also does not have an ionizer, which means it does not release any ozone. In its place, you’ll find a UV-C light, which sanitizes the air around it with UV light, killing bacteria and germs that may come into contact with it. This adds a nice layer of defense against illness, and makes a good alternative to ozone being released in the air.

The GermGaurdian is very quiet, and compact, but as a result, does not cover much area – especially when compared to top tier models like the Breathesmart or Rabbitair. Some users also complain about the smell it emits when first opened, though that does dissipate over time. Still, if you’re looking for an affordable, easy to use option that doesn’t have a lot of fancy features and is just needed to do one or two rooms, it’s a solid bet. And thanks to its small size and ease of use, it’s very quick to move around the house to whichever room calls for it.

View Product

The Airmega 400S is inarguably the best air purifier on the market. This unit combines superior air filtering performance with the latest technology to monitor and adjust its own settings.

The Airmega 400S is also WIFI enabled and comes with a companion app for iOS and Android phones. With this combination, the owner can be anywhere there is cellular service and check the air quality in the home, adjust settings on the unit or schedule the 400S to begin actively purifying the air at a certain time. With this feature, one can be at work and ensure that home is a haven with clean, pure air waiting.


The concept behind adding an air ionizer to an air purifier is to add a negative electrical charge to the air that passes through the purifier. This charge will cause particles that float into the space to stick together until they are too heavy to float then fall out of the air as dust.

The benefits are longer lasting filters on the purifier, thanks to the particles that are now not being trapped in it and fewer particles stuck to our lungs. The drawback of ionization is more dust to clean in the space.

Many people (understandably) confuse ionization with Ozone production. Ozone production almost always ionizes the air to some degree, but not all ionizers produce Ozone. If you want a filter that features ionization but would prefer no Ozone production, look for a list of ionizers that can be sold in California.

UV Light

A true HEPA filter does more than take dust or pollen out of the air. It also traps mold spores and potentially harmful bacteria. Such things should die on the filter, but there is always that chance that they will survive and form a colony there.

Air purifiers that feature a UV light system subject air passing through to intense Ultraviolet light to kill any tiny organisms that happen to be floating in that air.

How a Filterless Air Purifier Works

Many airborne contaminants and pollutants, such as allergens, are made up of positively charged ions. To remove these particles from the air, an ionic purifier emits a steady stream of negatively charged ions.

Because opposites attract, the negative ions attach themselves to the positive ions forming an ionic bond. Eventually the bond becomes so large that the particle becomes too heavy to remain in the air and fall to the floor (or get captured on the electrostatic collecting plate located on the device).

Why Ionic Air Purifiers are So Popular

While air ionizers are not the only type of air purification technology available today, these devices have become very popular among households and businesses. The main reason is because they do not require costly filter changes.

Instead of using a paper filter, which gets clogged and deteriorates over time, most ionic purifiers have an electrostatic collection plate. This plate attracts the negatively charged particles from the air and collects them on an easy to reach surface. The electrostatic plate can then be washed clean and replaced, ready to purify the air repeatedly, over and over again.

As you can see, the most attractive aspect of filterless ionic purifiers is that once you buy the device, you never have to spend another penny to keep it working effectively.

Five Star FS808Ionic Air Purifier Pro with UV-C

Another feature you may like is the nightlight switch option. This produces a faint blue light that illuminates your room and makes it easy for you to see at night, without having to turn on bright lights.

Winix 5300-Air Purifier

This filter is the same size and uses the same fan and sensors as the 5500-2, and is also rated to 360 square feet. It comes in only one color, doesn’t come with a remote, and has slightly more charcoal in it’s filter—but not enough to meaningfully reduce VOCs and odors.

How we tested

For 201we conducted two new tests of air purifiers. John Holecek re-created his 201lab tests in a new round of testing, including new models. Tim Heffernan did a week-long real-world test—the first of its kind that we know of—using Wirecutter picks and competitors in a New York City apartment.

The lab results give a measure of absolute performance under controlled conditions and act as a baseline for comparison of the air purifiers’ performance. The real-world results give something equally useful: a detailed picture of how our air purifiers performed in an everyday home (wool rugs, pollen, city air, a cat)—and, as it happened, in the middle of a stretch of hazardous outdoor air quality.

Both tests concentrated on particle filtration; John also measured VOC (molecular) filtration, noise levels, and ownership cost over time.

Between the two writers, they re-tested our longstanding main pick, the Coway AP-1712HH Mighty; our runner-up, the Winix 5500-2; and our pick for VOC removal, the Austin Air HM-400. We also tested five new purifiers:

Molecular filtration

In 2014, John measured all of that year’s test purifiers for their effectiveness at removing VOCs, or molecular pollution. He added milliliters of ethanol to a Pyrex dish heated to 50 degrees Celsius (12°F), where it quickly evaporated, and used a fan to distribute the vapors through the test lab. He then measured the concentrations of ethanol vapor at the beginning (averaging about 3parts per million), and again after 1minutes of running the air purifiers at their highest moderate speed. (Test equipment was an RAE Systems miniRAE 3000 VOC meter.)

The results from the VOC testing were illuminating. While most air purifiers we tested claimed to be effective at removing VOCs, most had almost no impact, including the Coway AP-1512HH Mighty (our main pick). That’s because most use only a thin sorbent filter of activated carbon, alumina, and/or zeolites (a class of minerals with a unique physical form that means they can act as molecular filters). However, one model stood out: The Austin, which contains 1pounds of activated carbon and zeolite, left only 1percent of baseline ethanol remaining.

Both upfront and operating costs are a significant part of owning an air purifier. These units can be expected to last for several years, so we took a long view at the cost of ownership of our picks, including the purchase price, electrical consumption, and recommended filter replacement schedule, using the shortest time for filter replacement if a range was specified.

2016/1cost calculations. Purchase cost as of August 201Note: The Austin filter lasts five years, so the annual cost is calculated by dividing its price by five.

Real-world test details

For Tim’s real-world tests, he pitted seven air purifiers against the New York City summer air. As it happened, the week he ran the tests was one of the worst, in terms of air pollution, of 2018, with temperatures in the high 90s and numerous health advisories related to outdoor air quality.

He measured the purifiers’ performance against particulate air pollution with a TSI Aerotrak 9306, a professional-grade handheld particle counter capable of measuring particles down to the HEPA-standard 0.3-micron size.

His “lab” was the back room of his Queens apartment. It’s approximately 200 square feet (18.square meters; 1feet by 12.feet), with 8-foot-ceilings. The floor is hardwood but mostly covered with old wool rugs. There’s some wood furniture and a daybed with a wool blanket. The building is across the street from a well-planted city park and in the middle of a very leafy neighborhood. Elevated trains run past two blocks north and two blocks south, and two major thoroughfares—Queens and Northern boulevards—are just a few blocks farther. Big Alice, the city’s largest power plant, is a mile or so west; three highways, the BQE, the LIE, and the GCE, are a similar distance east, north, and south. He lives just outside the usual approach flightpath to LaGuardia International Airport. And he has a cat. Simply put: His apartment is a good place for testing particulate air pollution, from pollen, dust, and pet dander to soot and exhaust.

Pull Quote

The week he ran the tests was one of the worst, in terms of air pollution, of 2018, with temperatures in the high 90s and numerous health advisories related to outdoor air quality.

He set each air purifier 1inches from one of the long walls of the back room, about a third of the way from one end of the room. He set the particle counter 6.feet (meters) away, 90 degrees to one side of the purifier, about a third of the way from the other end of the room. This was to avoid any potential “halo effect” of cleaned air settling near the purifier and creating a false reading.

The TSI Aerotrak 930detects particles as small as 0.micron, which is the standard for HEPA certification. Photo: Tim Heffernan

Tim ran two tests on each purifier: a 20-minute cycle on the sub-55-decibel setting (medium/midrange on most machines), and a 30-minute cycle on the high setting. Each test consisted of 20 or 30 45-second sensing periods, separated by 15-second periods with the particle counter idling, in order to generate a minute-by-minute picture of how the purifiers were performing.

Immediately prior to each test, he took a 45-second reading on his balcony, to set an outdoor baseline, and another in the test room with the purifier off, to set the indoor baseline. He then turned on the purifier and left the room for the duration of the test.

Each morning, before any tests, he simply measured the particulate levels in the back room for 20 minutes, to get a baseline on how the room was “behaving” that day: Even in still air, particulate levels vary as particles clump together, settle on surfaces, or kick back up if someone (like a Wirecutter writer) walks past.

He did not attempt to hermetically seal the room—after all, we wanted to see how the machines performed in real-world conditions—but did take two steps to make it more like a typical home with central HVAC. Tim sealed off the through-wall air conditioner with foil and tape, in case of leaks around the perimeter—most homes don’t have large holes in their outer walls. And he closed the vents on his apartment’s two forced-air ventilation shafts, which draw about 200 cubic feet of air per minute out of the apartment—and a corresponding amount into it from outdoors. (Central HVAC, by contrast, recirculates the inside air.)

After the back-room tests were finished, he conducted two additional tests. First, on a handful of units (our main pick and the large-room models), to see how they performed when running on high in a large space (the 600-square-foot living room-kitchen-dining area-hallway), with the AC on and people moving around as they normally would. And second, on our main pick, to see how it performed overnight on low with the air conditioner blasting and a guest using the daybed in the back room.

As in the lab tests section above, these graphs show the test models’ absolute performance when measured against the initial particle concentration, but in Tim’s real world apartment. And again, they show the percent change each purifier achieved, allowing for direct comparison of purifier performance by eliminating differences in initial pollution levels. The key takeaways here:

The competition

In 2018, we also tested the Dyson Pure Hot + Cool Link for particulate performance in the lab and in the real-world New York apartment. It offers two distinct fan functions, diffuse and focused; we tested it on both functions in the lab and in the real world. John further tested the Hot + Cool Link for VOC removal in the lab, given that Dyson received an upgrade of its VOC filter since our 201test of its predecessor. In every case the Dyson delivered disappointing performance relative to our pick. On particulates, it proved considerably less effective, reducing particulates by roughly 2or 50 percent (low and high fan settings respectively), versus 50+ to 85+ percent from other models. And as a VOC filter, it barely reduced the pollution level beyond the background conditions: to 34.parts per million (of vaporized ethanol) in 1minutes on the highest fan speed, versus the 36.ppm background level over the same timeframe—a percent reduction. Compare that to our pick for VOC removal, the Austin Air HM-400, which achieved an 8percent reduction in our 201lab test. It’s only fair to note that the Dyson is a unique machine, combining the functions of a fan, a space heater, and an air purifier—both HEPA (particulate) and VOC (molecular)—no other purifier we tested attempts this broad utility. But the Dyson Pure Hot + Cool Link objectively underperformed simpler, single-function air purifiers that also cost much less. Given its high upfront cost and relatively weak performance, we can’t recommend it.

Jump back.

Molekule advertises its technology as PECO—photo-electrochemical oxidation. It is a variant of photocatalytic oxidation, or PCO, which came to prominence in the 1990s, as a way of eliminating ethylene—a ripening agent naturally produced by fruit—in cold-storage fruit warehouses. In the early 2010s, a PCO home purifier, the Airocide, was introduced to great fanfare but deeply dubious results. Molekule’s PECO variant is 1to 100 times faster than what we’ve seen before, but Molekule says (in our lengthy interviews and in its own literature) that the fundamental chemistry is similar if not identical.

Air Purifiers

Everyone wants to keep their families well and protect them from viruses, germs, smoke, assorted gases, bacteria, and even assorted allergens that can make loved ones will. One of the best ways to keep the house free of these disease causing substances is with an air purifier. If you are looking for the best air purifier in India, you should browse through the ones that are listed below, along with their features, customer reviews and the characteristics that make it a great choice to care for one’s family.

Change Filter Indicator

If the air purifier has a filter that needs to be changed when the filter is dirty, it needs to provide notification that it’s time to change the filter. When the filter is dirty, it is no longer able to purify the air. A change filter indicator is one of those must-need features.

AHAM Certification

This seal should be on each air purifier because the clean air delivery rating identifies how efficient the device is for eliminating tobacco smoke, dust, and pollens in specific room sizes. It’s important to know because of the room size that air purifier is to clean so that the right size is purchased.





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Final Word

First of all thanks for reading my article to the end! I hope you find my reviews listed here useful and that it allows you to make a proper comparison of what is best to fit your needs and budget. Don’t be afraid to try more than one product if your first pick doesn’t do the trick.

Most important, have fun and choose your Air Ionizers wisely! Good luck!

So, TOP3 of Air Ionizers



Questions? Leave a comment below!

Chatting about Air Ionizers is my passion! Leave me a question in the comments, I answer each and every one and would love to get to know you better!

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