The 8 best air purifiers for smoke, odors, and dust in 2024

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Of all the places to catch your breath, home should be the ultimate sanctuary. But sneaky indoor pollutants like dust, pet dander and smoke from cooking can compromise air quality. Even if it's not allergy or wildfire season, irritants from cleaning supplies, paint, and even new furniture can accumulate, creating a cascade of bothersome symptoms like sneezing, congestion, and watery eyes.

Fortunately, the best indoor air purifiers tackle the airborne pollutants that ail you, swiftly cleansing the air you breathe, pronto. Here are our top eight picks for a healthier, fresher home environment, tried and tested.

We interviewed three experts and tested over 40 units to find the best air purifiers that will improve air quality. Our top pick is the Coway AirMega Mighty AP-1521HH; it removed the most pollutants, allergens, and VOCs in our tests and operated quietly — all with a low footprint. For a budget option, consider the Lasko LP300 HEPA Tower Air Purifier. It's well under $100 with low filter replacement costs, though it's best for small rooms.

Learn more about how Insider Reviews tests and researches home products.

Our top picks for air purifiers

Best overall: Coway AirMega Mighty AP-1521HH - See at Amazon

Best budget: Lasko LP300 HEPA Tower Air Purifier - See at Amazon

Quietest: Blueair HealthProtect 7470i Smart Air Purifier - See at Amazon

Best for large rooms: Honeywell PowerPlus HEPA Air Purifier - See at The Home Depot

Best for small rooms: Levoit 300S Air Purifier - See at Amazon

Longest-lasting filter: Shark NeverChange Air Purifier Max - See at Amazon

Best for smoke: Winix 5500-2 Air Purifier - See at Amazon

Best for odors: Oransi TrueCarbon 200C Air Purifier - See at Walmart

Best overall

The Coway AirMega Mighty AP-1521HH air purifier was the fastest among every model we tested at removing air pollutants like dust, pollen, pet dander, and volatile organic compounds (VOCs). An excellent choice for allergy sufferers, it's equipped with a multi-filtration system: a washable pre-filter, a true HEPA filter to capture airborne particles like viruses, bacteria, and pollen, and an activated carbon filter that reduces cooking, smoke, and pet odors. It also features an ionizer; however, we don't recommend using the ionization function (see why in the FAQ). Fortunately, you can manually turn it off.

While this version is not WiFi equipped and it doesn't have a remote control either, it's easy to set up and use. Even more important for the day-to-day, it runs quietly. I appreciated its eco-friendly design and Eco Mode option. When this setting is selected, the air purifier's fan automatically stops to save energy after 30 minutes of no detected pollution, a feature no doubt behind its ranking for lowest energy consumption among the units we tested.

The Coway displays air quality in real time with a light that turns from red (unhealthy) to purple (moderate) to blue (good). It automatically adjusts the fan speed accordingly and can run on one-, four-, or eight-hour timers. I found its appearance unobtrusive, but some users may find the manufacturer's recommendation to place it on a slightly elevated surface, such as a table or stand, inconvenient. Overall, we think the Coway AirMega AP-1521HH Mighty air purifier is the best choice for medium-to-large rooms, especially for pet owners and allergy sufferers.

Annual filter replacements typically cost around $60 and include a True HEPA Filter and 1 Activated Carbon Filter. The HEPA filter should last a year, while the carbon filter lasts six months. There is also a filter life indicator.

Best budget

The Lasko LP300 HEPA Tower Air Purifier is $65 cheaper than any other unit tested, has the lowest filter replacement cost, and, at under 10 pounds, doesn't feel like a heavy-duty appliance. 

We found it performed just as well as models that cost three or four times as much. The Lasko air purifier quickly removed airborne dust and debris. With 30 minutes to spare in the testing period, our air quality monitor registered no particulate matter. Though its performance wasn't as impressive with VOCs, it did a good job keeping the levels in a safe range.

Setup was straightforward and took about five minutes. The Lasko's light weight makes it easy to move around, so you can take it with you from room to room, which you may need to do since its low CADR makes it better suited for small rooms. If you need more oomph, consider the LP450, which is only $16 more and covers twice as much space.

The Lasko was one of the few units we tested that was louder than ambient sound levels, even when on low. At 45.6 dB on low, it was a little bit louder than a typical library. On high, it was only 51.6 dB.

The biggest negative of this model is that it uses a lot of power. This is likely due to its lack of an auto mode that adjusts with the air quality, which is another negative.

Filters are affordable and widely available, too, with an expected cost of $35.99 yearly. 

Quietist

The Blueair HealthProtect 7470i Smart Air Purifier is the quietest and most high-tech model we tested. On high speed, it's about as loud as a quiet office. On low, the 7470i is no louder than ambient sound.

The Blueair HealthProtect 7470i features a digital color touchscreen that allows you to operate the appliance and track the temperature, humidity, and air quality for VOCs and three different particle sizes.

The Blueair app (iOS and Android) puts the data and functions at your fingertips wherever you are, including the ability to set a schedule. It's also compatible with Alexa and Google Assistant. I found the app worked well for the most part, though there were times when the data readouts took up to an hour to refresh. Also, connecting to the app upon initial setup took a few tries, which added 10 minutes to the process.

The HealthProtect 7470i has a HEPA-type filter (see our FAQ for how this differs from a true HEPA filter) that looks like a partially open book and features an RFID chip that tracks the filter life. The filters are comparatively affordable, about $55 annually, and can be ordered in the app or through major retailers, including Amazon. Other than replacing the filter, the only other maintenance is occasionally vacuuming or washing the two prefilters.

In the air-quality tests, the Blueair purifier performed well. After the two-hour testing period, it had one of the lowest VOC readings, and it removed 99% of the particulate matter. The power consumption was about average among the units I tested, which is impressive considering the midrange CADR. 

I found the Blueair HealthProtect 7470i a little too unwieldy to move easily from room to room. At 27.2 pounds and without good handles, this is a purifier you'll want to keep in one spot.

Best for large rooms

The Honeywell PowerPlus HEPA Air Purifier (model number HPA3300) was the top performer for large rooms. An hour and fifteen minutes into our test, it had removed 99% of the particulate matter and lowered the VOC levels to nearly zero. While it hasn't specifically been certified by the Asthma and Allergy Foundation (AAFA), these numbers suggest this is an excellent air purifier for allergy sufferers and those sensitive to other irritants.

The setup was quick and intuitive; it simply required removal from the package before plugging it in. And there's little maintenance. Just wipe the unit down with a dry cloth every three months. Two distinct filter indicator lights make filter replacement a no-brainer: the HEPA filter is changed once a year, and the prefilter requires replacement every four months).

The HPA3300 isn't without its negatives. First, it's one of the loudest models we tested. When on low fan speed, it's no louder than the surrounding noise, but on high, it registered 64 decibels (dB), which is about as loud as a normal conversation. At over 20 pounds, it isn't as portable, though it does have a handle to help with transport.

That said, it's similar to most models in power use and filter replacement costs (about $100 each year), and we think its performance makes it the best air purifier for large rooms, especially for allergy sufferers.

Read our full review of the Honeywell PowerPlus Air Purifier.

Best for small rooms

The Levoit 300S Air Purifier is an excellent option for bedrooms and other small rooms because it has three layers of filtration. The pre-filter captures larger debris, including hair and pet dander; the true HEPA filter collects smaller airborne particles; and the carbon filter helps reduce VOCs and odors in the air.

The carbon filter's performance was evident in our testing as the Levoit 300S was among the best at removing VOCs. The purifier also did well with particulate matter, removing virtually all (99.2%) of it from the air during the testing period.

The setup was a snap. I had the unit up and running in under 5 minutes and connected to the VeSync app (available for iOS and Android) in another five. The Levoit 300S is the most affordable WiFi-connected air purifier I've tested, and the smart functions work well. I could easily monitor and schedule it from anywhere, and the air quality readings were almost identical to the readings on our testing monitor.

The Levoit 300S is Energy Star-certified and has an auto mode that adjusts the fan speed based on the air quality. It proved to be one of the lowest energy consumers we tested.

Maintenance is minimal: vacuum the pre-filter once or twice a month and replace the filter every 6 to 8 months when the indicator light turns on. Filters are affordable and widely available, costing about $55 a year.

The noise level at high fan speed was average, a little louder than in a quiet office. But at low speed, it was no louder than ambient noise. 

Longest lasting filter

While most filters need to be replaced quarterly — and we've seen some filters last up to a year before needing to be changed —Shark takes long-lasting filters to the next level. The Shark NeverChange Air Purifier Max can last up to five years before you need to replace the filter, and when you do, that filter costs $90, which is significant because some filters cost that much just to run annually. The size of the room (up to 1,400 square feet) and the amount of time you run the unit will ultimately determine how much life you get out of the filter, but according to Shark, the five-year number is based on running the air purifier in a 300-square-foot room at the highest speed for 12 hours a day.

From a performance perspective, the Shark took less than 15 minutes to reduce the amount of particles from incense smoke in a 200-square-foot room by 90%. It's also one of the quietest models, just behind the Blueair: an unobtrusive 46 decibels when running on high, and ambient at other levels. 

All controls are handled directly on the unit. The Shark NeverChange Air Purifier Max is not WiFi-equipped, but the LCD screen can show the clean air percentage, the cleanliness level of the pre-filters, or real-time particle count. You can also adjust the fan speed or let it run on Auto. It has one of the lowest energy uses, at about .08 kwh a day. 

Despite minimal upkeep costs, it's not completely maintenance-free; two pre-filters, which catch larger particles like pet hair, need to be wiped or vacuumed periodically. The display screen shows a filter-life percentage and will alert you when the filters need cleaning. 

Finally, the Shark NeverChange is a larger model, and while you can move it around from room to room, it won't be the most comfortable to do so. Shark also offers a smaller version rated for rooms up to 650 square feet. 

Read our full Shark NeverChange Air Purifier Max review. 

Best for smoke

The Winix 5500-2 air purifier was our top contender for reducing smoke to improve air quality. Its three-stage filtration system features a true HEPA filter, activated carbon filter, and washable pre-filter that capture 99.97% of airborne pollutants, from allergens to smoke. Winix air purifies also features its own technology dubbed PlasmaWave, which reduces odors, airborne bacteria, and mold growth by creating positive and negative ions that combine with natural water vapor to form hydroxyls. It's technically an ionizer, so we recommend turning off the setting, but Winix claims and third-party tested that it does not cause harmful ozone, which can irritate lungs.

To determine the most effective smoke air purifier, we performed an additional test where we smoked up a 200-square-foot room with incense until the particulate matter reached 325. Then, we extinguished the incense, turned the air purifier onto auto mode, and timed how long it took toreach 5 PM, repeating the test for each model.

Of the four models, the Winix 5500-2 cleared the air the fastest: 5 minutes sooner than its sister model the Winix T810 or Honeywell and 25 minutes faster than the pricey Molekule, making it a solid choice for households dealing with smoke from cooking or tobacco.

A stand-out feature of this model is its Smart Sensors, which automatically adjust the air purifier's fan speed based on detected pollution to minimize energy consumption. Air quality is displayed on the indicator as blue (good, amber (fair) or red (poor). It's equipped with a light sensor that automatically turns on sleep mode when the room is dark, activating the lowest speed and dimming all the lights on the unit. It also operates quietly (even at higher settings), making it a great choice for bedrooms.

If you're looking for a smart option, the Winix T-810 air purifier is a commendable alternative. It features Wifi connectivity and can be controlled via an app so you can adjust the settings and monitor air quality remotely. But for those looking for a simpler option sans the bells and whistles, we like the Winix 5500-2. Overall, it's an excellent option for performance and value, particularly for smoke filtration.

Best for odors

The Oransi TrueCarbon 200C Air Purifier is our top choice for removing odors like cigarette smoke, paint fumes, and diaper pail smells. Truly a no-frills option, this model comes ready to go and is set up in a flash. I just removed it from the box, plugged it in, and used the included remote to turn it on and manually adjust the fan speed. Plus, it's compact, light, and easy to move; it can reside on the floor or tabletop.

The Oransi is straightforward to use, with no air quality sensor, app, or WiFi connection feature to navigate. In addition to doing a nice job of clearing out VOCs and particle matter in our incense tests, this air purifier, which uses a 3.2-pound carbon filter — which is thicker and more efficient than competitors, according to the company — eliminated every hint of odor from the small patio where my cats' litter boxes are stationed. While this model did a good job of clearing VOCs during our tests, carbon filtration is not engineered to filter pollen, dust, or other particulate matter.

One drawback is the noise level. Even at the lowest setting, the Oransi is loud. Our sound meter registered 46 dB, which is 21 dB louder than the quietest model we tested. Another con is that this model doesn't have an auto mode. That means you have to use your judgment to choose the setting (from one to ten) based on the severity of the odor.

That said, if you're looking to eliminate odors in small-to-medium-sized rooms, the Oransi TrueCarbon 200C Air Purifier is a great option. However, filter replacements, which need to be replaced one to two times a year, are pricier than competitors.

What else we tested

Over the last year, I've tested 30 air purifiers, and there are several that we almost included in our guide that are still worth considering:

Additional air purifiers we recommend

Air purifiers under $250

Winix T810 Air Purifier: This smart air purifier is whisper-quiet on its lowest setting and can purify rooms up to 400 square feet nearly five times in an hour, but it struggles to lower VOCs. Its ultra-sensitive air quality indicator shows particle counts on the LCD screen, but they do not always match up with our external air quality monitor. The Winix air purifier also features Plasmawave technology, which is technically an ionizer, but you can turn that feature off and operate it without it.

Levoit Vital 200S Smart Air Purifier: This budget-friendly air purifier has a three-stage filtration that captures pet fur, particles and fumes. It's low maintenance and filter replacements are more affordable than other models we tested. With auto mode and a smart app, you can control the settings and monitor your air quality from anywhere. Overall, it's a solid option and covers a larger area than the Levoit Core, our pick for small spaces.

Honeywell HPA 5200 (Large rooms): This model performed well and did a decent job of clearing smoke and other particulate matter from the room. However, it's heavier and bulkier than other models that performed as well or better. Plus, it uses more energy and runs louder than competitors, even on the quietest setting.

PuroAir 240 Air Purifier: This value-priced air purifier is compact and tabletop-sized and features a built-in air quality indicator. It did an average job of getting rid of particles but struggled to decrease VOCS, and our test did not trigger the auto mode into overdrive. It uses more energy than others and the annual filter replacement cost can stretch to over $150, negating the lower upfront costs.

Clorox Large Room Smart True HEPA Air Purifier: This relatively inexpensive wifi-enabled air purifier has many of the bells and whistles found on pricier models, like support with Alexa, a digital air quality display, and a three-stage filtration system. It's quiet with a compact design but didn't clear VOCs as well as other models comparable models we tested, like the Oransi.

Instant Air Purifier 300: The makers of the wildly popular Instant Pot have ventured out of the kitchen for the first time with this unit, and it's a great reasonably priced solution. It was one of the top removers of VOCs, didn't use much power, and was easy to clean and maintain. Yet it was one of the worst at removing particulate matter, and it operates loudly. 

Brondell Horizon O2+: For its affordability, this Brondell air purifier did an outstanding job, and I'd recommend it if our top budget pick isn't available. It was one of the top removers of particulate matter in our tests and was easy to maintain and clean. The biggest negative is that it doesn't have an auto mode that adjusts the fan speed based on air quality. This would have been nice since it consumes a lot of power.

Air purifiers under $450

Dreo Air Purifier Tower Fan: This air purifier and fan combo is a fraction of the cost of a Dyson competition and does a good job of purifying the air, too. Its breezy and powerful fan modes across 12 speeds can work in tandem or separately. Unfortunately, replacement filters seem to be in limited supply, which is inconvenient.

Coway Airmega 250: This is another great option we've tested from Coway. The 250 was one of the best removers of particulate matter. It also used minimal electricity in our tests, thanks to the fan that adjusts based on the air quality. However, it didn't beat any of the models in the above categories, and it didn't perform well at removing VOCs from the air.

Mila: Mila is a midrange smart air purifier with a variety of filter options (only available on the company's website) depending on the air quality issue you want to address. I tested the heavy-duty Overreactor, a hospital-grade H14 HEPA filter, and the Basic Breather. The Overreactor was in the middle of the pack in our air purifying tests. The Basic Breather was outstanding at removing particulate matter. But both operated loudly, and there wasn't anything else that made them stand out.

Blueair Blue Pure 211+ Auto: This is the updated version of the Blueair Blue Pure 211+, the top pick in our previous version of this guide. The main addition is an auto mode, which adjusts the filtering speed and intensity based on the air quality. We found it did a good job of filtering the air while using minimal electricity, but it was loud, and filters are expensive and only available on the Blueair website.

Air purifiers over $450

Alen Breathesmart 45i: This Alen air purifier relies on a medical-grade H13 true HEPA filter, which did an outstanding job of removing particulate matter from our test room. This model is also easy to set up, transport, and maintain.  However, filter replacement will set you back about $140 per year, and it didn't do well in reducing VOCs in the air. 

Coway Airmega 400S: Our previous pick for the best smart air purifier, the Coway Airmega 400S is an attractive unit that barely makes any sound and adjusts the fan speed based on the air's pollution level, which lends itself to low energy use. It lost its title due to its average performance in our purifying tests and its smart features aren't as fancy as our smart and quiet pick from BlueAir.

RabbitAir MinusA2: If we had a "most visually appealing" category, this model would win. We weren't particularly impressed with how well it did cleaning the air. However, it was easy to set up and maintain. Plus, the filter replacement costs are reasonable.

Molekule Air Pro: With its sleek design and hefty price tag, we expected more from this model. However, both the Winix 5500-2 and T810 models outperformed the Molekule in our tests, and at a fraction of the price. When poor air quality caused the air purifier to kick into the highest setting, it was noticeably louder, too.

Which air purifiers we don't recommend

PhoneSoap AirSoap: The biggest reason the AirSoap isn't in our guide is because it relies on ionization to clean the air, and there is no way to turn it off. In fact, we don't recommend ionizing air purifiers for most people (read why here). The benefits of ionization are questionable, and there's a risk of negative health issues due to the low levels of ozone the AirSoap produces. However, it did well in our air purifying tests, operates quietly, doesn't have filter replacement costs, and is easy to set up and transport.

Aura Air Mini: Like the AirSoap above, the Aura Air Mini relies on ionization to clean the air. It's unique in that it is only three inches deep and wide and 4.5 inches high. It runs for up to six hours on a single charge. It's designed to be used in small spaces, but we're not sure of the use cases. You wouldn't want to use it in public and potentially expose vulnerable individuals to ozone. And in your car, you already have a filtration system.

Dyson HP09: As a space heater, The HP09 does an outstanding job of heating and cooling rooms up to 800 square feet in size. The only problem is that it was one of the worst performers in our air purifying tests.

Honeywell Insight HPA5300B: I like the looks of this air purifier, and it's easy to maintain and has widely-available filters. However, it used a lot of electricity and is loud on high speed. Plus, its performance in the air purifying tests was unimpressive.

IQAir Atem: We were hoping this would be a good compact option, but it performed poorly in the air purifying tests and has high upfront and filter costs. 

BetterAir Biotica800: The Biotica800 releases a probiotic mist for 30 seconds every 70 minutes. It runs quietly during those 30 seconds, and its electricity use was too low for our smart plug to register anything. However, if it does anything to clean the air, our air quality monitor didn't notice.

EnviroKlenz Air System Plus: This is the heaviest and least visually appealing purifier we tested. It's designed to take a beating and is used by the US Navy. However, it had the highest VOC reading at the end. It doesn't have an auto mode, used the most electricity, and has the highest filter costs of the bunch.

What to look for in an air purifier

With so many options available, choosing the best air purifier for your needs can be overwhelming. To help narrow down the options, consider these guidelines from the Environmental Protection Agency (EPA):

• Room size: Air purifiers are designed for specific room sizes, typically measured in square feet, so choose an air purifier that can effectively cover the space you plan to use it in. Before making a purchase, check the manufacturer's guidelines on the maximum room size each unit can handle. A unit that is too small will not clean the air effectively, while an excessively large one may be unnecessarily expensive and inefficient.
• CADR: CADR or Clean Air Delivery Rate measures the volume of filtered air that the air purifier delivers. In other words, it indicates how quickly it can remove pollutants like dust, pollen, and smoke. A higher CADR rating signifies better performance, but matching the room size in square footage is most important.
• ENERGY STAR Certification: ENERGY STAR certification indicates that an air purifier meets energy efficiency guidelines set by the EPA. Choosing an ENERGY STAR-certified model, designed to use less energy while effectively cleaning the air, can help reduce your energy footprint without sacrificing performance.
• HEPA filtration: High-efficiency Particle Air (HEPA) filters most effectively capture airborne particles. A true HEPA filter can trap at least 99.97% of particles that are 0.3 microns in size, including dust, pollen, mold spores, and pet dander. Choosing a model with a genuine HEPA filter provides the best air-cleaning performance. Models with a pre-filter trap larger particles, and carbon filters assist with odors.
• Filter replacement costs: Ongoing maintenance costs, including filter replacements, can add up over time, so consider how frequently the air filters need to be replaced. That way, you can choose a model that fits your budget in the short and long term.
• Avoid ozone-emitting units: Some air purifiers, particularly those that use ionization technology, can produce ozone as a byproduct. Ozone can be harmful to health, particularly for people with respiratory issues, and the EPA advises against ozone-producing air purifiers. Instead, choose an air purifier that's certified by the California Air Resources Board (CARB) or that's been tested to ensure it does not emit ozone.

How we test air purifiers

James has been reviewing heating, cooling, and air-quality devices for the past three years. Heidi lives with pets and allergies and has come to rely on air purifiers to keep symptoms at bay. For this guide, they've tested about 40 air purifiers for at least one week each and consulted with Ravi Pandey, MD, an internal medicine specialist on staff at several South Florida hospitals; Junfeng Zhang, PhD, professor of global and environmental health at Duke University; and Bryan Buckley, the brand manager for One Hour Heating & Air Conditioning.

Based on research and interviews with experts, the most important features to consider when shopping for an air purifier are its ability to remove irritants from the air, long-term costs, and ease of use.

Here are the main ways we test each model:

Purifying: We burned incense in a 200-square-foot room with the windows and doors closed and used an air-quality monitor to take measurements of the volatile organic compounds (VOCs) and particulate matter in the air every 15 minutes. After the incense burned for 15 minutes, we turned on the air purifier's auto mode, which adjusts the fan speed based on the air quality. If it didn't have an auto mode, we used the highest setting. We looked at both the percentage removed and the amount of VOCs and particulate matter left after two hours. For context, all of the recommended room sizes in our guide are calculated assuming an eight-foot ceiling and four air changes per hour (ACPH).

Setup: We timed how long it took me to set up the air purifier from opening the box until the unit was running. This includes connecting to an app when applicable. We'll note any unusual or confusing steps. Most models only required removing the packaging and plugging in the unit. This generally took five minutes or less.

Portability: We moved the air purifiers around thehouse, noting how easy they were to carry. A model that weighed more than 20 pounds or was hard to move physically lost points. Most units were easy to move and featured handles.

Long-term costs: Electricity and filter replacement are the biggest long-term costs, which can often outpace the upfront costs. We looked at how much a year's supply of filters costs and whether they're widely available and not just on the manufacturer's website, which can make it hard to price shop. We also used a smart plug to measure the power consumption of each unit over the course of 24 hours under normal circumstances on the same setting used for the purifying tests.

Noise: An air purifier's operation should not interfere with hearing the TV, sleeping, or having a conversation. To test this, we used a sound meter to measure the air purifiers on their highest and lowest settings from four feet away. On low, most units were indistinguishable from ambient noise. 

Maintenance: We cleaned each air purifier per the manufacturers' recommendations and noted how easy each model was to clean. We also noted whether there were indicators to let us know when to clean or replace the filter.

Air purifier FAQs

Why do I need an air purifier? 

An air purifier does what its name implies, cleaning odors, pollen, pet dander, and more from indoor air. According to the EPA, units with HEPA filters can improve symptoms of COPD and asthma sufferers and effectively remove ash and smoke particles.

What do air purifiers remove from the air?

The type of filter a purifier has determines what pollutants it can remove. HEPA filters are popular because they can remove smoke, pollen, bacteria, pet dander, dust, mold, and other particulate matter of 0.3 to 10 microns. Activated carbon filters can remove VOCs and other gases.

What does HEPA mean?

HEPA is an acronym for "high-efficiency particulate air." The EPA defines a true HEPA filter as a filter that captures at least 99.97% of airborne particles that are 0.3 microns in diameter. This includes bacteria, dust, pollen, and mold.

Are all your picks true HEPA filters?

No, but we give preference to true HEPA filter air purifiers in our picks. The exception is the Blueair 7470i, which has a HEPA-type filter that performed just as well, if not better, than most true HEPA models.

What's the difference between true HEPA and HEPA-type filters?

True HEPA filters capture 99.97% of airborne particles that are 0.3 microns in diameter. According to the EPA, true HEPA filters can more easily catch particles larger or smaller than 0.3 microns. There's no standard for HEPA-type filters.

Can an air purifier prevent the spread of the novel coronavirus?

According to the EPA, air cleaners are not enough to protect against coronavirus. Yet, an air purifier can help protect you and your household when used with best practice recommendations from the Centers for Disease Control and Prevention.

Can HEPA or H13 purifiers capture viruses, including the coronavirus?

Ravi Pandey, MD, a specialist in internal medicine in Florida, said HEPA air purifiers wouldn't eliminate the coronavirus. Still, they help, especially when used with mask-wearing, hand washing, and social distancing.

What can you do to get the most out of your air purifier?

Bryan Buckley, the brand manager for One Hour Heating & Air Conditioning, suggested always keeping your air purifier running in one spot. He added that you need continuous air purification to clean the air and maintain good air quality levels.

Where do you put an air purifier? 

Air purifiers are best in high-traffic areas, such as your kitchen, living room, or bedroom. A purifier is also excellent at removing smoke from cooking. Buckley said you should position the unit to blow clean air where people gather and close your windows during use.

How often do you change the filter?

It varies. Manufacturer guidelines range from every 3 to 24 months. We list the replacement schedule for the models in our guide. Follow the schedule in your air purifier's user manual for optimal efficiency and performance.

Can plants help clean indoor air?

Probably not. The Journal of Exposure Science & Environmental Epidemiology published a study in 2019 showing that indoor vegetation did not remove air pollutants.

How can you keep your air clean if you don't have an air purifier?

You can clean the air without a purifier by cleaning regularly, ventilating with fans, and storing chemicals outside of your house. Junfeng Zhang, PhD, professor of global and environmental health at Duke University, recommended wearing N95 masks in polluted areas.

Are air purifiers worth it?

If you cannot take steps to improve your indoor air quality by other means or the pollutants still seem to stick around, an air purifier is an intelligent choice. Even the worst air purifiers we tested improved indoor air quality.

Are ionizing air purifiers safe?

Ionizers can generate ozone, a lung irritant. Enesta Jones, an EPA spokesperson, said even low amounts of ozone could cause shortness of breath, chest pain, throat irritation, and coughing. Because of this, we don't recommend any air purifiers that don't let you turn off the ionizing function.

Can air purifiers help with wildfire smoke?

Yes. Zhang recommended air purifiers with HEPA filters to improve indoor air quality in areas affected by wildfires. Air purifiers will be most effective if you keep windows and doors closed. Also, have purifiers in each room rather than moving one from room to room.

Air purifier terms to know

In this guide, we throw around a lot of terms you may not be familiar with. Here are a few definitions of terms and acronyms that are commonly used when talking about air purifiers:

CADR: Clean air delivery rate. Typically measured in cubic feet per minute or cubic meters per hour, the CADR tells you how much air an air purifier can clean.

cfm: Cubic feet per minute. This is the most common unit of measurement used to express how much air an air purifier can clean.

HEPA: High-efficiency particulate air. True HEPA or HEPA-type filters are generally considered to be the gold standard in the industry.

VOCs: Volatile organic compounds. These compounds have low water solubility and high vapor pressure. They are commonly produced in the manufacturing of refrigerants, pharmaceuticals, and paints and are often found in paints, craft materials, adhesives, markers, furniture, pesticides, cleaning supplies, and more.