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Best Air Purifiers – Top Picks and Buyer’s Guide

Written by Tuck Staff

Quick Overview

Air quality is integral to good sleep. Unfortunately, a wide assortment of contaminants – including dust mites, volatile organic compounds (VOCs), and microbes like bacteria, viruses, and mold – are commonly found in bedrooms. To cleanse their sleeping areas of contaminants, as well as unpleasant smells, many sleepers turn to air purifiers. These devices can benefit sleepers with allergies and asthma, as well.

Air purifiers rid rooms of contaminants using either active purification, which converts chemicals and gases into harmless molecules; or passive purification, which extracts contaminants using a built-in filtration system. Most air purifiers sold today fall into five categories based on their design: HEPA (passive), activated carbon (passive), ionizer (active), ultraviolet germicidal irradiation (active), and ozone (active). Additionally, some models utilize two or more of these systems simultaneously. Our research indicates that purifiers with HEPA and/or activated carbon filtration systems tend to produce the best results.

This guide will explore the pros and cons of different types of air purifiers, and also includes our picks for the best air purifiers sold today. Our choices are based on verified customer and owner experiences, as well as intensive product research and analysis.

Best Air Purifiers

The Best Air Purifiers – Reviewed

Best OverallMolekule

Best Overall – Molekule


  • Destroys pollutants at the molecular level
  • Replaces air in 600 sq. ft. room hourly
  • 60-day trial period
  • 2-year warranty
  • Extremely quiet
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Best OverallMolekule


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Molekule is an air purifier that uses nanotechnology to purify particles out of the air that are up to 1,000 times smaller that what HEPA filters can catch. The Molekule purification system uses two filters: a “pre-filter” that captures larger particles like dust and hair, and a filter that breaks down pollutants at a molecular level. The second filter uses Photo Electrochemical Oxidation (PECO) technology. PECO uses light-activated free radicals to oxidize pollutants. While other air purifiers filter unwanted particles out of the air, the Molekule literally destroys them. It can destroy particles that are too small for HEPA filters to trap, such as airborne chemicals, bacteria, viruses, and mold spores.

The Molekule is at a higher price point than many air purifiers at $799. The Molekule runs quietly and is more energy efficient than many air purifiers. It is portable and cylinder-shaped, which allows it to clean air equally from all directions. It works well in larger rooms and can completely replace the air in a 600 square foot room in one hour. The Molekule comes with a 60-day trial period and 2-year warranty.

Good for:

  • People needing to filter air in a large room
  • Those seeking the highest air quality possible
  • People with allergies and illness issues
  • People who are bothered by loud air purifiers
  • Shoppers with larger budgets

Best FeaturesIonic Comfort Quadra Air Purifier

Best Features– Ionic Comfort Quadra Air Purifier


  • Ionizer filtration
  • Up to 400 sq. ft. coverage
  • Customizable speed
  • Air changes 5 times per hour in a 225 sq. ft. room
  • 2-year warranty
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Best FeaturesIonic Comfort Quadra Air Purifier

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The Ionic Comfort Quadra Air Purifier from Sharper Image is an updated version of its classic model. This newer model is quiet and economical for all-day use. Special features include speed control, a “Check Filter” indication light, and a UV-resistant exterior to prevent discoloration.

An active purification system in the Ionic Comfort significantly reduces allergens and particles in the air. The ionizer technology uses a chemical charge to attract particles to the purifier. Since there is no HEPA or carbon filter, there is no need to buy replacements. Simply clean the stainless steel filter in the sink or dishwasher to remove particles. The Ionic Comfort’s quiet technology never gets above 57.4 dB on high speed, which is great for shoppers who want less noise. The low-speed setting ranks at just 34.7 dB. Customers looking to save space may also appreciate the tower design to fit in a corner easily.

If you wish to try out the Ionic Comfort Quadra Air Purifier, Sharper Image has a 60-day trial. Purchasing the air purifier comes with a 2-year warranty.

Good for:

  • Those needing to filter air in moderate to large rooms
  • Shoppers who want a quiet purifier
  • Individuals seeking a space-saving tower purifier
  • People with allergies
  • Those who live with pets

Best CoverageCoway Airmega

Best Coverage – Coway Airmega


  • HEPA and activated carbon filtration
  • 1,256 to 1,560 sq. ft. coverage
  • 4 speed settings
  • Adjustable timer up to 8 hours
  • 5-year warranty
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Best CoverageCoway Airmega


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In terms of purification coverage, the Coway Airmega stands alone. This model comes in two sizes based on coverage area: the Airmega 300 covers 1,256 sq. ft.; and the Airmega 400 covers 1,560 sq ft. Both models are suitable for living rooms, bedrooms, and most other rooms found in today’s homes, as well as garages. The Airmega utilizes a HEPA and activated carbon filtration system that eradicates up to 99.97% of allergens, mold, and, dust. It also offers three purification modes: auto, eco (which conserves the fan in relatively pure rooms), and sleep (which is much quieter).

The Airmega had four speed settings, as well as a time that can be set for one hour, two hours, four hours, or eight hours. It also has a built-in air quality monitor with a crisp, easy-to-read LED display, and a ‘filter life time indicator’ that tells owners when to swap out the filters.

The Airmega 300 is widely available for roughly $400, while the Airmega 400 is usually priced closer to $570. Amazon Prime members qualify for free shipping when they order either Airmega purifier. Both models are covered under a five-year warranty.

Good for:

  • Sleepers with very large bedrooms
  • People with allergies
  • Those who are sensitive to smells
  • Shoppers with bigger budgets

Best for Pet DanderRabbitAir MinusA2

Best for Pet Dander – RabbitAir MinusA2


  • HEPA and activated carbon filtration
  • 700 to 815 sq. ft. coverage
  • 5 speed settings
  • Automatic sleep-mode adjustment
  • 5-year warranty
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Best for Pet DanderRabbitAir MinusA2


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The MinusA2 from Rabbit Air features an active purification system with a HEPA and activated carbon filtration system, which eradicates allergens such as dander and dust mites using a six-phase purification process; this makes it more effective than most conventional filter-based purifiers. The MinusA2 is available in two models, each with different coverage areas: the SPA-700A can cover up to 700 sq. ft.; and the SPA-780A can cover up to 815 sq. ft. The SPA-780A is also available in an advanced, WiFi-compatible design that connects to smartphones and other iOS devices.

The MinusA2 has five different speed settings, outnumbering many competing models, and will automatically adjust to sleep mode when placed in darkened rooms. The purifier can rest on the floor or be mounted on a wall, as well.

Prices for the MinusA2 start at $550, making it a good option for shoppers with bigger budgets. Amazon Prime members qualify for free delivery options. The Rabbit Air MinusA2 is backed by a five-year warranty, which is much longer than average compared to other air purifier warranties.

Good for:

  • Sleepers with large bedrooms
  • People with dander and other allergies
  • Those who are sensitive to smells
  • People who live with dogs or cats
  • Shoppers with bigger budgets

Best Compact PurifierBlueair Blue Pure 411

Best Compact Purifier – Blueair Blue Pure 411


  • HEPA and activated carbon filtration
  • 175 sq. ft. coverage
  • 3 speed settings
  • Exceptionally quiet
  • 1-year warranty
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Best Compact PurifierBlueair Blue Pure 411


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At 3.5 pounds and less than 18 inches high, the Blue Pure 411 from Blueair is one of the smallest air purifiers on the market. Its coverage area is smaller – roughly 100 to 175 sq. ft. – but the device uses a combination of HEPA and activated carbon filtration that will eradicate 99% of allergens, dust mites, and other contaminants from any small to moderately sized bedroom. It is also effective at minimizing odors. Three fan speeds are included, as well as a non-adjustable timer.

The Blue Pure 411 also produces relatively little noise, with a volume range of 17 to 46 decibels; most larger purifiers are at least 50 decibels at their quietest. It also produces five air exchanges (or filtrations) per hour, which is on par with higher-coverage models.

The Blue Pure 411 is widely available for less than $90, making it a high-value pick. It is backed by a one-year warranty.

Good for:

  • Sleepers with small bedrooms
  • People with allergies
  • Those who are sensitive to smells
  • Value seekers

Air Purifiers Buyer's Guide

A bedroom’s air quality is important for getting a good night’s sleep. Many people rely on air purifiers to rid their sleeping quarters of dust mites, microbes and other airborne particles, as well as bacteria, viruses, volatile organic compounds (VOCs), and unpleasant odors. Air purifiers are particularly beneficial to people with allergies and/or asthma. Air purifiers sold today fall into four general categories based on the type of filtration used: HEPA, activated carbon, ionizer, and ozone; some purifier models utilize more than one of these systems, as well as UV technology. Although high-end air purifiers can cost hundreds of dollars, shoppers can usually find models for $100 or less.

This guide will explore the purpose and functionality of air purifiers, some benefits and disadvantages of using one, tips for first-time buyers, and our picks for the top-rated air purifiers according to actual owners.

How Do Air Purifiers Work?

Air purifiers remove contaminants and irritants from indoor air using one of two general techniques:

  • Active purification, which uses a process known as ionization to remove contaminants by either completely destroying them or by collecting them on a plate. This makes it somewhat inefficient compared to passive purification.
  • Passive purification, which removes pollutants from the air using a filtration system. This is considered the more efficient system since contaminants are removed from the air, rather than converted.

Most air purifiers sold today utilize one (or more) of the following four technologies:

HEPA: An acronym for High Efficiency Particulate Air, HEPA is a filtration system that must (according to industry standards) trap at least 99.7% of particles larger than 0.3 microns, which include chemicals, spores, and other particles that cannot be seen with the human eye.

HEPA filters are accordion-shaped and made of ultrafine fibers. They use four processes to trap particles of different sizes:

  • The first process is sieving. As large particles are carried by the airstream, they become trapped in between the filter fibers because they are too large to pass through.
  • The second process is interception. Large particles are trapped immediately, and smaller particles that come within a certain distance of a filter fiber will be sucked in and held in place like an adhesive due to chemical or electrostatic attraction.
  • The third process is impaction, during which friction causes smaller particles to attach themselves either to the filter fibers or to larger particles that are already stuck to the filter.
  • The fourth process is diffusion, which essentially slows down smaller particles, buffeting them with gas particles and increasing the chances of impaction or interception.

Particles accumulate on the filter whenever air passes through, resulting in cleaner air each time. Larger particles are immediately trapped, while smaller ones are trapped later in the process. HEPA filters generally need to be replaced every two to four years; replacement filters are widely available.

HEPA filters are considered the most effective air purifiers for removing particles, as well as the most common and, in most cases, the cheapest. However, they do not remove odors or volatile organic compounds (VOCs), which are emitted from paint, adhesives, and other gas pollutants. One important note: some purifiers advertise as using ‘HEPA-like technology’ or use similar verbiage, but this usually means the filters do not meet official HEPA standards.

Activated carbon: ‘Activated carbon’ (also known as activated charcoal) refers to a form of carbon that has been modified with small, porous openings that expand its surface area. Active carbon technology employs filters that feature low-volume pores that are extremely absorbent and react chemically with some pollutants, sticking to them firmly.

As a result, activated carbon purifiers trap odors, VOCs, and other emissions that cannot be trapped by HEPA filters. However, they are less efficient when it comes to trapping dust mites, microbes, and other pollutants. For this reason, some purifiers feature HEPA and activated carbon filters.

Ionizer: Also known as negative ion purifiers, ionizers rely on active purification (unlike HEPA and activated carbon purifiers that use the passive method). Ionizers essentially zap particles with a chemical charge and collect them using one of two methods:

  • The particles are drawn to the purifier, where they can be wiped off.
  • The particles collide with other particles, which causes them to stick to the other particles and eventually become unable to float; they may then be swept up or vacuumed.

This method, while scientifically advanced, is somewhat inefficient because it transfers particles to other areas of the room, rather than absorbing them or trapping them in a filter. This poses the risk of the particles breaking free and reentering the air.

Ozone: Ozone purifiers clean the air using ozone gas. This technology is controversial because ozone, when produced at high levels, can be toxic to humans. Long-term exposure to smaller amounts can also lead to health problems. As a result, ozone purifiers have not received official approval from any federal safety oversight agency.

The upside to ozone purifiers is that they are effective at removing odors and some gases — but not dust or other particles. They can also be used to sterilize bacteria and molds — but only in well-ventilated environments. As a result, ozone purifiers often feature ionizers as well.

UV technology: UV technology uses active purification to sterilize mold, bacteria, and viruses, which prevents them from being able to reproduce. However, this technology is not particularly effective at targeting allergens.

The table below summarizes the key differences between HEPA, active carbon, ionizer, ozone, and UV purification technology:

Technology HEPA Active Carbon Ionizer Ozone UV
Type of Purification Passive Passive Active Active Active
Particle Effectiveness Yes No Yes No No
Bacteria Effectiveness Yes No Yes Yes Yes
Virus Effectiveness Yes (99%) No Yes Yes Yes
VOC Effectiveness No Yes No Yes No
Odor Effectiveness No Yes No Yes No

Regardless of the technology used, air purifiers commonly feature the following components:

  • A timer that can be programmed for certain intervals.
  • Adjustable speeds, which include lower settings for quieter purification and higher settings for more effective purification.
  • Manual or remote controls. Most purifiers sold today feature the former.

The following components are associated with certain purification technologies:

  • HEPA and activated carbon purifiers feature a filter, which may need to be changed every six months to two years, depending on the model; some models feature washable filters, but these are considered less effective. These purifiers also have an indicator light that lets owners know when the filter needs to be replaced.
  • HEPA and activated carbon purifiers use a fan to draw in particles, bacteria, and other contaminants, where they become stuck to the filter.
  • More advanced HEPA and activated carbon purifiers are equipped with contaminant sensors that automatically adjust the settings based on how dirty or clean the room is.
  • Active purifiers feature an ionizer (see above), which hits contaminants with a chemical charge and either removes (but does not eliminate) them from the air or converts them into harmless molecules.

Purifiers are considered a sleep aid because airborne contaminants can cause health problems like congestion, headaches, stuffy noses, sneezing, and shortness of breath — all of which are proven to negatively affect sleep quality. This is especially true with people who have allergies, as well as those with asthma.

Additionally, most purifiers produce a subtle whirring sound that similar to the output of white noise machines, which are also used as sleep aids. White noise and other noise colors (such as pink) drown outside noise and allow people to fall asleep more easily. Some air purifiers come with a specialized ‘sleep’ setting, which is usually the lowest and quietest, and thus the most conducive to sleep.

Important Considerations for Air Purifier Shoppers

Here are a few important factors to take into account when shopping for a new air purifier and comparing different brands and models:

  • How much does the purifier cost? The price-point of an air purifier may range from $50 to more than $500, depending on the brand, model, and technology used. Pick a purifier that’s within your budget, and do not assume that a higher price-tag indicates higher quality.
  • How big is the purifier? Some purifiers are tall and bulky but most are designed to take up minimal floor space. Your bedroom dimensions should be the deciding factor for the proper purifier size. Height may be a major consideration, as some purifiers measure more than 20 inches tall.
  • How much does the purifier weigh? Although this varies significantly, most purifiers on the market weigh between 10 and 25 pounds. Be sure to test your bedroom floor before investing in a heavier model.
  • Does the purifier use active or passive purification? There are benefits and downsides to both. Air purifiers that use active purification tend to be quieter, but there are health risks associated with ionizer and UV technologies; additionally, this method is considered less effective because it converts contaminants, rather than eliminating them. Passive purifiers completely remove contaminants and are highly effective (for the most part), but the filters need to be replaced semi-regularly and the purifiers can be somewhat loud.
  • What are the operating costs of the purifier? Ionizers and ozone purifiers don’t have parts that need to be replaced, so the operating costs for these models boil down to electric bills. Filter-based purifiers are costlier; expect to pay at least $150 per year in utilities and replacement parts, including the filter. Some filters cost as little as $10 to $20, while others are $100 or more.
  • What kind of contaminants do you need to eliminate or collect? As the table above shows, no purifier technology is effective at eliminating particles, bacteria, viruses, VOCs, and odors. Evaluate your home to determine the contaminants that matter most — and if need be, invest in a more expensive purifier that uses multiple technologies to target a wider range of contaminants.
  • What is the coverage area? Most air purifiers are rated for effectiveness within certain room dimensions. Larger sizes can provide more coverage than smaller ones, and many models are available in multiple sizes. Measure the square footage of your bedroom before selecting a purifier; otherwise it might not be as effective as you would like.
  • How many speed settings are included? Most purifiers sold today have multiple settings. Lower settings are typically best for sleeping time, and higher settings are better for times of the year when certain contaminants are high (such as pollen season).
  • What are the timer settings? Most purifiers allow you to customize the timer, but some older models do not.
  • Are there auto-adjustment settings? Some air purifiers are equipped with technology, to automatically adjust their settings based on the amount of particles detected in a certain room, and may also lower speed settings when there is no daylight.
  • Does the purifier come with a warranty? Most purifiers come with some sort of warranty, which may last anywhere from one year to lifetime coverage.

Additional Tips for Purifying Bedroom Air

There are other ways to cleanse the air in your bedroom other than (or in addition to) using a purifier. These include the following:

  • Keep plants in your bedroom. This will improve oxygen levels in the room through natural purification.
  • Never smoke in your bedroom. Purifiers are designed to reduce or eliminate particles from secondhand smoke, but smoking in your room may offset this. Also avoid burning candles, incense, and other smoke producers in the bedroom.
  • Vacuum the room frequently. This will help keep particles out. If you use an ionizer or ozone purifier, this will be necessary to completely eliminate contaminants.
  • Do not store VOC-emitting substances in the bedroom. Paints, adhesives, solvents, and other harmful substances should be kept in sheds, garages, or other areas that are separated from living quarters.
  • Open windows in the bedroom when you are at home. This will greatly improve air circulation. However, this may not be possible during pollen season; clean the filters of your cooling unit in order to minimize particles in the air during high allergen periods.
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