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6 best ozone-free air purifiers, based on our tests

These air purifiers are certified ozone free
Updated on January 25, 2024
Written by
Teddy Booth
Teddy joined HouseFresh in 2019 as a senior content producer, producing written content as well as product photography and YouTube videos. He supports Danny as a product tester and is our lead how-to writer.

Our verdict

  • My number one pick from our ozone-free air purifiers is Levoit’s EverestAir. This powerhouse of an air purifier has exceptional cleaning performance, comes with lots of smart features, looks great, and emits zero ozone.
  • If your budget is limited, check out TaoTronics TT-AP003. This unit has everything you need, from an ozone-free air purifier without the high price tag to match.
  • If you want an ozone-free air purifier to compliment your smart home, I recommend the Mila. The brain in this unit will cover all of your smart needs and boasts a large collection of filters to choose from.

Many air purifiers on the market boast about a different kind of air cleaning technology, that supercharges (or outperforms) the ability of the usual filters to remove harmful pollutants from your air. We call these units ‘air ionizers’ or air purifiers with an ionizer function.

But air ionization is not new.

Ionizers were more popular in the early 2000s, right up to the point when they were found to produce dangerous ozone levels. In 2010, rules were put in place that meant all air purifiers had to be tested and meet CARB-certified standards of less than 0.050 parts per million (ppm) or 50 parts per billion (ppb).

Even when air purifiers meet these standards, units with ionizers can still produce levels of ozone as a byproduct that can be harmful to those sensitive to this gas. For context, the air purifier that produces the highest amount of ozone (as per Energy Star) is the AirDog X5, which produces 28 ppb. 

So, while an ionizer can help eliminate contaminants from your room, is it really worth the risk? 

At HouseFresh, we believe that anyone with respiratory issues should avoid ionizers. Our data shows that the right air purifier (with high quality HEPA and activated carbon filters) will help without generating any harmful byproducts.

In this guide, I will take you through the best ozone-free air purifiers on the market so you can choose the best unit for your home.  These are all air purifiers that we  have bought and tested ourselves, so we know what we’re talking about.

  1. In our home lab of 728 cubic ft, we light an incense stick to generate particle pollution and VOCs.
  2. We set up our trusted Purpleair Indoor Sensor with the latest Bosch gas sensor to track levels of PM1ug/m3, PM2.5ug/m3 and PM10ug/m3 and VOCs in the air.
  3. We switch the air purifier to its highest speed and measure how long it takes to get our room air quality down to PM1 level to 0.
  4. We use an energy meter to measure precisely how much electricity is used when running the unit at the lowest and highest fan speed settings.
  5. We track sound levels emitted by the air purifier at different fan speeds with the help of a commercial sound meter.
    sound meter

Staff picks: Top 3 ozone-free air purifiers

Whether you’re looking for a purifier to remove gasses and odors, airborne particles, or an all-rounder that will target both, there is an ozone-free purifier for everyone on this list.

EverestAirTaoTronics AP003Mila
AIR CLEANING SPEED ⚡13 minutes29 minutes35 minutes
CADR 👩‍🔬360 CFM (612 m3/h)226 CFM (384 m³/h)263 CFM (447 m³/hr)
FILTER TECHNOLOGY 💨3-Stage Filtration H13 HEPA with activated carbon pelletsHEPA (ranges from H12-H14) + Activated charcoal
MAX ROOM SIZE 📏558 sq. ft.322 sq ft1000 sq. ft
WEIGHT ⚖️20.7 lbs (9.38 kg)18 lbs (8.16 kg)18 lbs (8.16 kg)
OUR REVIEW 🔍Levoit EverestAir reviewTaoTronics AP003 reviewMila review
PRICE 💵$249.99$99$419.99

Last update on 2024-02-20 / Affiliate links / Images from Amazon Product Advertising API

Those were just my top picks. Read on to find out more excellent mechanical-based units without ionizing or active filtration technologies. 

1. Best ozone-free air purifier: Levoit EverestAir

Everything you need from an ozone-free air purifier, including the looks and performance to rival any unit on the market.

My top recommendation can seem a bit controversial with the recent claims from Dyson that led to Levoit removing the use of the word ‘HEPA’ from all their marketing materials.The reason why the EverestAir (and other Levoit units) made this list is their air cleaning performance. Even without a H13 True HEPA filter,, the EverestAir is still the highest-performing air purifier we have tested in our home lab.

What we really like

It’s the most powerful Levoit unit we’ve tested — it cleaned the air in our home lab in just 13 minutes
It is easy to use, thanks to its intuitive controls
Ability to adjust the vent angles, something unique to this model
It displays PM1.0, PM2.5 and PM10 levels on its air quality sensor display
If Apple designed air purifiers — incredibly modern, cool design

What we think could be better

It is on the expensive side for a Levoit air purifier
The wheels only move in one direction, making it a little more challenging to move around

As soon as we unboxed the EverestAir at HouseFresh HQ, I knew we were in for something special. This unit looks very different from other Levoit air purifiers both in terms of what’s going on in the outside (air quality display, adjustable air vents, front panel, wheels) and on the inside (large and thick 3-stage air filter) . Levoit has also packed the EverestAir with all the smart features you’ll need in the modern home, including auto mode, sleep mode, turbo mode, timer, air quality indicator and app connectivity. 

The EverestAir incorporates a powerful motor and large fan to achieve its high CADR of 360 CFM. I was blown away when we conducted our cleaning performance test, as it cleared our home lab of pollutants in just 13 minutes.

A new HouseFresh record.

The EverestAir achieves all of this without producing a hint of harmful ozone.


HouseFresh Rating:★★★★★
Time to clean our test room:13 minutes
Air purifier technology:3-Stage Filtration (Pre-filter for large particles, main filter for airborne particles, high-efficiency activated carbon filter for odors and gasses)
Recommended room size:558 sq. ft.
Clean air delivery rate (CADR):360 CFM (612 m3/h)
Dimensions (in inches / in cm):18.9L x 8.5W x 23.2H inches (48L x 21.6W x 58.9H cm)
Weight (in pounds / in kg):20.7 lbs (9.38 kg)
Noise level (low – high):24 – 56dB
Filter life:12-15 months
Warranty:2 years
Estimated energy consumption:$87.25 per year
Country of manufacture:China


If you like the sound of a Levoit air purifier but your budget doesn’t quite stretch to the EverestAir, then check out the Levoit Core 600S. It’s powerful, packed with features, and only costs around $300.

2. Best budget option: TaoTronics TT-AP003

This air purifier proves you can have excellent cleaning power and various smart features at a budget price.

The cost of air purifiers can start to stack up when you start adding high-performance fans, evolving filtration technology and intelligent smart features. Luckily there are a few units out there that have all of these qualities and still manage to keep prices low. Here’s one of my favorite budget air purifiers we have tested.

What we really like

It rivals the performance of air purifiers that cost north of $200
It contains activated charcoal pellets over a bonded sheet
Replacement filters are highly affordable
It comes with smart features you don’t expect to find on an air purifier under $100

What we think could be better

The plastic and finishing feel a little cheap
It is usually out of stock and so are the replacement filters

TaoTronics is known for making a variety of electrical devices for the home and their air purifiers have become strong rivals to the more popular brands like Levoit, Blueair and Coway. The AP-003 is proof that high-performance, ozone-free air purifiers with smart features can come with an affordable price tag.

At first, I was a little unsure of the manufacturer specifications as they state the TT-AP003 is equipped with H13 HEPA filtration with activated carbon pellets, boasting a CADR of 226 CFM. All that for less than $100? 

But this air purifier proved itself during our air cleaning performance test by clearing our home lab of smoke pollutants in only 29 minutes — that’s 11 minutes faster than the former king of budget units: the Levoit Core 300.

The TT-AP003 is a great performing air purifier with plenty of smart features all for under $70.


HouseFresh Rating:★★★★★
Time to clean our test room:29 minutes
Air purifier technology:H13 HEPA with activated carbon pellets
Recommended room size:322 sq ft (30 m²)
Clean air delivery rate (CADR):226 CFM (384 m³/h )
Dimensions (in inches / in cm):21.8 x 14.1 x 7.9 inches (55.4 x 35.8 x 20cm)
Weight (in pounds / in kg):18 lbs (8.16 kg)
Noise level (low – high):32dB – 52dB
Filter life:3 – 6 months
Manufacturer’s warranty:1 year
Estimated energy consumption:$30.48 per year
Country of manufacture:China


If you’re looking for an air purifier that’s a little smaller, check out the Shark HP102. This small, smart unit is ideal for kitchen worktops and/or home offices and is cheap to run.

3. Best smart unit: Mila

The perfect air purifier for the modern home – eight smart sensors that can be customized to clean the air in your room.

People have different priorities when it comes to wants and needs from an air purifier. For some, it’s all about the smart features. If smart capabilities and automatic features are high on your list, have a look at this air purifier from Mila

As well as being ozone-free, the Mila is the Swiss army knife of air purifiers. 

What we really like

It comes with eight different smart sensors that allow the unit to scan the room and adjust automatically to what’s needed
You don’t need to delve into settings if you’re not techy — the Mila can do it all without you
The design is beautiful all the way down to its stylish wooden legs
There are seven different filters to choose from to tackle a variety of air quality issues

What we think could be better

You’re paying $$$ for that smart brain — if smart features are not high on your list of priorities, you can save some money with a different unit
The replacement filters are not cheap

The large digital screen on the Mila displays all the information you need about your current air quality thanks to its eight different built-in sensors that scan your room for micro-particles, carbon monoxide, humidity and VOCs — the Mila even senses when someone enters the room and reduces noise levels not to disturb you.

You can spend hours customizing this air purifier to your individual needs (either on the display or in the Mila smartphone app), but you don’t have to: you can just set it to its Automagic Mode and the Mila will take care of everything on its own.

Apart from it being the smartest air purifier in our arsonal, the Mila comes with an impressive range of seven different filters to further customize the unit to your needs. From The Basic Breather to The Overreactor (I know, the names are a little much), all your air quality needs are met without emitting any harmful ozone.


HouseFresh Rating:★★★★☆
Time to clean our test room:35 minutes
Air purifier technology:HEPA (ranges from H12-H14) + Activated charcoal (granular carbon)
Recommended room size:1000 sq. ft.
Clean air delivery rate (CADR):263 CFM (447 m³/hr)
Dimensions (in inches / in cm):12L x 12W x 15H inches (30.48L x 30.48W x 38.1H cm)
Weight (in pounds / in kg):18 lbs (8 kg)
Noise level (low – high):24dB – 74dB
Filter life:6 months 
Manufacturer’s warranty:1 year
Estimated energy consumption:$52.56 per year
Country of manufacture:China


If you like the aesthetic of the Mila, but aren’t too fussed with all the tech, check out the Smart Air S Air. All the looks, none of the tech and definitely no ozone.

4. The quietest option: Smart Air Blast Mini

A robust air purifier engineered for performance – no apps, no sensors, no ozone…no nonsense.

Smart Air may not be as well known as long-standing manufacturers such as IQAir or Alen, but the units we’ve tested proved that they really know what they’re doing. The engineers at Smart Air are focused on building high-performing air purifiers without the dangers of producing ozone.

What we really like

It’s made from metal rather than plastic — long-lasting and environmentally friendly
It offers a massive CADR of 435 CFM
The filter can last up to four years
It is easy to use thanks to its one-dial operation

What we think could be better

It is heavy and not as easy to move between rooms — luckily it comes with wheels
It doesn’t come with an activated carbon filter as standard, so you will have to add it as an extra

As you can see from the pictures, the Blast Mini is a big air purifier with a robust metal shell. Underneath its tank-like exterior is a large powerful fan and a huge H13 HEPA filter. Its high CADR of 435 CFM can quickly filter the air in large spaces up to 915 sq. ft as it did in our performance tests by clearing the contaminants in our home lab in just 17 minutes.

I’ve mentioned how big the filter is already, but Smart Air has also managed to make it last up to 4 years (in comparison, the AP-003 filter, which lasts 3-6 months). Unfortunately, the Blast Mini doesn’t come with an activated carbon filter as standard, but I highly recommend spending that bit extra and getting one.


HouseFresh Rating:★★★★☆
Time to clean our test room:17 minutes
Air purifier technology:H13 HEPA Filter
Recommended room size:915 sq. ft.
Clean air delivery rate (CADR):435 CFM (740 m³/h)
Dimensions (in inches / in cm):22.6L x 13W x 24.8H inches (57.5L × 33W × 63H cm)
Weight (in pounds / in kg):59 lbs (26.8 kg)
Noise level (low – high):36 – 49 dB
Filter life:33 months
Manufacturer’s warranty:1 year
Estimated energy consumption:$277.70 per year
Country of manufacture:China

5. Best for VOCs and odors: IQAir Healthpro Plus

Engineered, manufactured and tested in Switzerland – an air purifier made for those who are serious about air quality.

VOCs and odors aren’t the easiest pollutants to remove from the air, especially in large rooms. In order to clear chemical fumes, gasses and smells from the air, you will need an air purifier with a filter packed with activated carbon — the more, the better. That’s exactly what you get with the IQAir Healthpro Plus.

What we really like

Its filter contains 5 lbs of activated charcoal
Its HyperHEPA technology is the best around, supercharging the filtration efficiency of the HEPA filter 
It comes with a 10-year warranty
The filters can last up to 4 years before they need to be replaced

What we think could be better

There is no auto mode function (but you will get a handy remote control)
The price is at the top end of air purifiers — this unit is built to last

When it comes to ozone and the technology generating it, IQAir takes a firm stance. They often highlight the danger ozone can pose to our health and oppose using ionizers and other active technologies, questioning the long-term benefits they offer. So much so, that they have disassociated themselves from the industry-standard CADR ratings, partly because ozone-emitting purifiers often score highly, despite the dangers they pose.

Danny (HouseFresh Founder) has been running the Healthpro Plus in his home for nearly two years, and he still swears by it. The IQAir Healthpro Plus is the ideal choice if you’re looking for an ozone-free air purifier that can deal with VOCs and unwanted smells in large rooms up to 1,125 sq. ft.


HouseFresh Rating:★★★★★
Time to clean our test room:25 minutes
Air purifier technology:HyperHEPA and V50-CELL gas and odor filter
Recommended room size:450 to 1125 sq. ft. 
Clean air delivery rate (CADR):300 CFM (510 m³/h)
Dimensions (in inches / in cm):28H x 18W x 16D inches (71H x 38W x 41D cm)
Weight (in pounds / in kg):35 lbs (16 kg)
Noise level (low – high):25 – 69dB
Filter life:4 years
Manufacturer’s warranty:10 years
Estimated energy consumption:$165.04 per year
Country of manufacture:Switzerland

6. Best for medium-sized spaces: Levoit Vital 200S

Everything you expect from a premium-priced air purifier rolled into a budget-friendly, ozone-free unit.

We already got our hands on the Levoit Vital 100, so we knew we had to test the next model up. The Levoit Vital 200S is a more advanced air purifier for medium-sized rooms that performs better than its little brother and comes with a high CADR, smart features and low running costs — all for under $200.

What we really like

Excellent CADR to $ ratio — this is the best performing unit you can buy for less than $200
It comes with the same smart features as you see in premium-priced air purifiers
It remembers your settings after being unplugged
There are many generic filter replacements available that keep running costs low

What we think could be better

I would like to see an independent certification and test confirming its HEPA rating
The air quality sensor needs cleaning periodically and if you forget, this will impact the unit’s performance

When you buy an air purifier in this price range, you don’t necessarily expect it to have all the bells and whistles that come with more expensive units. Well, the Vital 200S comes packed with all of them: sleep mode, auto mode, timer, display lock and an air quality indicator. Plus, you can monitor and control everything from Levoit’s VeSync smartphone app.

We also didn’t expect an air purifier in this price range would come with all those features AND  would have outstanding air cleaning performance. We were surprised to see the results of the Levoit Vital 200S in our air cleaning test: the Vital 200S cleared our home lab of smoke pollutants in just 21 minutes — extremely impressive. 

Levoit has pushed its engineers to create a unit that both performs impeccably, is easy to control and looks modern and stylish. All with zero ozone emitted into your air. Bravo, Levoit.


HouseFresh Rating:★★★★★
Time to clean our test room:21 minutes
Air purifier technology:H13 TrueHEPA and activated charcoal filter
Recommended room size:375 sq. ft. (5 ACH)
Clean air delivery rate (CADR):245 CFM
– Smoke: 242 CFM
– Dust: 263 CFM
– Pollen: 240 CFM
Dimensions (in inches / in cm):15.6D x 8.5W x 19.8H inches (39.3D x 21.5W x 50.2H cm)
Weight (in pounds / in kg):13.2 lbs (5.9 kg)
Noise level (low – high):24 – 54dB
Filter life:12 months
Manufacturer’s warranty;2 years
Estimated energy consumption:$37.84 per year
Country of manufacture:China

Other ozone-free air purifiers we tested but don’t recommend

  • Austin Air HealthMate – This USA-made air purifier is great for tackling VOCs and gasses in the home with its enormous filter, but it’s a little overpriced for the air cleaning speed results we got from our testing. 
  • AROEVE MK01 – Even though this smaller air purifier doesn’t produce harmful ozone that could affect your health, its cleaning performance was sub-par in our home lab tests.  I don’t understand how it’s such a big seller on Amazon.
  • Honeywell HPA300 – This air purifier is ozone free and a great solution for cleaning airborne contaminants from large rooms. But, for me, it’s a bit too old and is missing lots of features that are basic in most modern units.
  • Dyson HP04 Pure Hot + Cool – It looks good, doesn’t emit any ozone and has the brand name associated with innovation, but it’s seriously overpriced for the air cleaning performance. Nice fan, though!

What to look for when buying an ozone-free air purifier 

If you want your air to be free of harmful ozone and your home to be pollutant-free, you’re gonna need an air purifier with (and without) certain features. Let me take you through my top priorities.

1. Avoid ionizers, UV-C, needle-point ion generators, bi-polar ions, electrostatic precipitation and plasma technology

The technology inside air purifiers that creates ozone can come in different names, but it’s usually known as air ionization. This type of technology can produce harmful ozone as a byproduct, and no matter how little of a byproduct it is, it can still have an adverse effect on your health.

In my opinion, you should steer clear of any air purifier with this technology, or to be honest, any technology that isn’t HEPA and activated carbon filtration.

2. Measure your room

The size of your room heavily dictates which air purifier you will need. If you introduce an air purifier that doesn’t have an appropriate CADR (Clean Air Delivery Rate) will either be ineffective or a waste of space and electricity.

The basic rule is: the bigger the room, the higher CADR you will need. 

We’ve taken all the guesswork out of it for you with our tool that allows you to see what CADR you’ll need for your room (in accordance with EPA guidelines of 4.8 changes per hour).

3. High performance filters with activated carbon

The most effective way to remove contaminants from the air in your home is to use an air purifier that contains quality filters with high levels of activated carbon, as they don’t create any chemical by-products. 

I usually only recommend HEPA filters, but with recent claims of branding violations, I’m changing my vocabulary to “high performance”.

Activated carbon is the material that removes odors, VOCs and gasses from your air, but only filters with a high concentration of carbon will make a difference.

4. Do you want (or need) smart features?

In our tech driven age, brands are adding more and more smart features to their air purifiers (unless you’re Smart Air). From air quality indicators and auto modes, to sleep modes and smartphone connectivity, you will need to consider which (if any) you will use.

Personally, I like air purifiers that give me as much data about the quality of my air as possible. I also use auto mode quite often, so I always units that have these options. If I can monitor and control my air purifier from an app, all the better.

Smart features usually come at an extra cost (check out the Mila), so you’ll need to factor this into your budget.


Common questions about ozone and air purifiers 

Yes, all the units on this list. 

Air purifiers that use ionizer technology (or similar) can emit harmful ozone as a chemical byproduct. So if an air purifier doesn’t use this technology, it won’t emit ozone into the air in your room.

You may have to do a little research to find your answer. If you go to the California Air Resources Board list of approved air purifiers, you can search for the brand and model of your air purifier. When you’ve found the right unit, look at the ‘Type’ column. If it says “Electrical,” then the product may generate ozone. But if it says “Mechanical,” it does not.

The simple is yes, 100%. Ozone-free air purifiers that contain HEPA filters and activated carbon filters are capable of removing 99.97% of pollutants from your air. They are the most effective way of making sure you have clean, uncontaminated air to breathe in your home.

Air purifiers can remove ozone and other gasses from your air, but only if they contain a filter packed with activated carbon. I suggest finding a unit that contains activated carbon pellets and as much as possible. If the presence of ozone is an issue in your home, I recommend you check out the IQAir Healthpro Plus.

Blueair air purifiers often come with ‘HEPASilent™ filtration technology’ that uses a combination of electrostatic and mechanical filtration. Electrostatic filtration can produce ozone as a byproduct, but Blueair states that “All Blueair air purifiers are CARB certified, which means that they are considered safe and do not exceed ozone emission limits”.

No. Just like Blueair (see FAQ above) some air purifiers use a combination of HEPA filtration and ionizer technology. This is usually stated by the manufacturer, but if you’re unsure, check out the California Air Resources Board list of approved air purifiers

Wrapping up

With all the contaminants that can pollute the air in your home, you don’t want to add ozone to that list. The harmful effects caused by ozone are no joke. Prolonged exposure to these chemicals can be seriously damaging to your health and the health of your family.

To be sure that you’re not being exposed to harmful ozone, you will need an air purifier that doesn’t use ionizer (or similar electrostatic) technology. 

There are plenty of air purifiers on the market that don’t use this technology, and some will actually remove any ozone in the air. This guide highlights the best of those that we have personally tested.

Happy hunting.

At HouseFresh, we have been reviewing air quality products since 2010. In all these years, we learned not to rely on manufacturers’ claims and the ever-so-glowing marketing materials. That is why we buy products with our own money, so we can write unbiased reviews after we’ve had enough time to evaluate air quality products in our home lab. Every unit we recommend has been thoroughly tested to assess its performance, energy consumption, and noise levels emitted in real-life environments. If you have any questions about our testing process for different types of air quality products, just drop us an email at hello@housefresh.com.

Last update on 2024-02-20 / Affiliate links / Images from Amazon Product Advertising API

About the author

Teddy Booth

Teddy joined HouseFresh in 2019 as a senior content producer, producing written content as well as product photography and YouTube videos. He supports Danny as a product tester and is our lead how-to writer.