Best Air Purifier Buying Guide

Different air purifiers work using a range of technologies. A few are helpful. Others are ineffective, or even potentially harmful to your health.

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Mechanical filters: These purifiers use fans to force air through a dense web of fine fibers that trap particles. Filters with very fine mesh are called HEPA filters. While they work on microscopic particles, they can also remove larger particles (including dust, pollen, and some mold spores) when they&#;re suspended in the air. (Some filters are labeled &#;HEPA-type&#; or &#;HEPA-like&#;&#;these have not been certified to meet the requirements of a true HEPA filter but may still perform adequately in our tests.) Mechanical filters don&#;t help with gases or odors. And they can be expensive to maintain. Mechanical filters need to be replaced every six to 12 months; they can cost upward of $200 per filter but typically cost no more than $80.

Activated carbon filters: Unlike mechanical filters, these filters use activated carbon to capture certain types of gases, including some odor-causing molecules. But they&#;re not particularly effective against formaldehyde, ammonia, or nitrogen oxide. Because activated carbon filters don&#;t combat particles, many air purifiers will have both an activated carbon filter and a mechanical filter. Activated carbon filters get saturated faster than mechanical filters, though, and require replacement more frequently&#;every three months, as opposed to every six to 12 months for mechanical filters. Make sure to budget for replacements accordingly: Activated carbon filters usually cost up to $50 each. 

Ozone generators: These machines produce ozone, a molecule that can react with certain pollutants to alter their chemical composition. This can result in dangerous indoor air quality, and CR does not recommend these types of air purifiers. Makers of ozone generators often claim that the devices emit safe levels of ozone, but in the past, our tests found that even at low settings, some ozone generators quickly exceeded the Food and Drug Administration&#;s limit of 0.05 parts per million for medical devices. Plus, studies reviewed by the EPA have shown that low levels of ozone&#;the chief ingredient of smog&#;don&#;t effectively destroy indoor pollutants. Research also shows that ozone has been linked to decreased lung function and increased risks of throat irritation, coughing, chest pain, and lung tissue inflammation. Ozone exposure might also worsen asthma, emphysema, and bronchitis.

Electrostatic precipitators and ionizers: In these electronic models, particles in the air become charged so that they stick&#;magnet-like&#;to plates on the machine or to nearby surfaces. CR doesn&#;t typically test electronic air purifiers nor recommend them because they can produce ozone.

Ultraviolet germicidal irradiation (UVGI): Some manufacturers claim that their air purifiers kill airborne viruses, bacteria, and fungal spores with UV lamps. But they might miss certain bacteria and mold spores that are resistant to UV radiation. To work, the UV light must be powerful enough and the exposure must last long enough&#;minutes to hours, rather than the few seconds typical of most UVGI air purifiers&#;to be effective. CR does not test UVGI technology, though some mechanical air purifiers we test may have the added function.

Photocatalytic oxidation (PCO): Some air purifiers use ultraviolet radiation and a photocatalyst, such as titanium dioxide, to produce hydroxyl radicals that oxidize gaseous pollutants. Depending on the pollutant, this reaction can generate harmful byproducts, such as ozone, formaldehyde, nitrogen dioxide, and carbon monoxide. CR does not currently test air purifiers with PCO technology. There have been few field investigations exploring the effectiveness of PCO air purifiers, but one laboratory study, conducted by researchers at Syracuse University in New York, reported that the devices did not effectively remove any of the VOCs typically found in indoor air. 

Photoelectrochemical oxidation (PECO): This variant of PCO emerged in from the manufacturer Molekule. The Molekule Air purifier did not score well in our tests for dust, smoke, and pollen removal. Since then we&#;ve also tested the more expensive Molekule Air Pro, which performed better at removing contaminants on its highest setting but did not impress in CR&#;s other air-purifier test categories, nor did it rate well in our CR member survey. 

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Ozone generators are highly effective at removing stubborn odors like cigarette smoke, mold, and pet odors from all areas of your home. Since they neutralize odors rather than masking them, we find that ozone generators are one of the best ways that you can help remove air pollution in your home.

To help you select the best ozone generators for you, our team researched a variety of models on Amazon. We also put together this generator buying guide to help you make the best purchasing decision.

Top 5 Ozone Generators

Compare Top Ozone Generators

ProductOzone OutputFilterWeightOverall DimensionsEnerzen Ozone Generator11,000 mg/hWashable5 pounds6.8 x 8 x 5.8 inchesAIRTHEREAL Ozone Generator5,000 mg/hWashable3.5 pounds6.7 x 7.4 x 6.8 inchesOdorStop Ozone Generator1,200 mg/hWashable10 pounds14 x 11 x 10 inchesEnerzen Commercial Ozone Generator20,000 mg/hWashable5 pounds6.8 x 8 x 5.8 inchesIvation Ozone Generator360 mg/hNot washable12 pounds12.5 x 11 x 15 inchesProductOzone OutputFilterWeightOverall Dimensions

Best Plate Longevity

Courtesy Amazon

Enerzen Ozone Generator

• $99.95

Prices taken at time of publishing.

This ozone generator has a pulsating fan and a configurable timer that allows you to set it anywhere for up to three hours for maximum customization. Furthermore, we like that it produces ozone that reaches up to levels of 11,000 mg/h to give your home a powerful clean.

• $99.95

  at

  Amazon

Pros and Cons

&#; Has easy-to-access ozone plates that provide approximately 6,000 hours of runtime
&#; Includes a large fan with a washable stainless-steel filter
&#; Is lightweight at 5 pounds

&#; More suitable for one specific room instead of the entire home
&#; The cord is somewhat short

What Customers Are Saying

We found that those who were happy with this ozone machine said that it was simple to operate, good for small spaces, and effective on odors such as cigarette smoke and pet waste. However, we also found that those who were unhappy with this ozone generator said that it produced a strong, noxious smell, while others claimed it became less effective the more it was used.

Most Portable

Courtesy Amazon

AIRTHEREAL Ozone Generator

• $79.99

Prices taken at time of publishing.

We were impressed that this ozone generator weighs just over 3.5 pounds and comes in a durable metal casing, making it easy to transport between rooms or on the go. It also has a timer that can last for up to 2 hours of continuous run time. The dial switch is also easy to use.

• $79.99

  at

  Amazon

Pros and Cons

&#; Includes &#;hold&#; setting that keeps it on past the timer
&#; Has an output of 5,000 mg/h level
&#; Has a removable, washable filter

&#; Has less coverage than some other ozone generators
&#; Not available in California

What Customers Are Saying

Those we found who gave this ozone generator positive reviews said that it was easy to use, was durable, and that it worked quickly. However, those who gave this product negative reviews said that it sometimes stopped working after minimal use, while others claimed that it was not powerful enough to remove tough odors.

Longest Runtime

Courtesy Amazon

OdorStop Ozone Generator

• $279.99
• $399.99
• 30% off

Prices taken at time of publishing.

This high-quality product can help purify the air and eliminate odors in any room up to 2,500 square feet, which we think makes it an ideal choice for high-traffic areas like gyms, hotels, and restaurants. Additionally, it has an adjustable 12-hour timer that includes a &#;hold&#; option.

• $279.99

  at

  Amazon

Pros and Cons

&#; Equipped with a UV Air Purification System
&#; Has two high-output ozone plates and a 110 CFM fan
&#; Has variable zone output up to 1,200 mg/h

&#; More expensive than most other ozone generators
&#; Not the best for mold

What Customers Are Saying

Customers our team found who gave this product positive reviews said it was excellent at eliminating difficult odors, was made from durable materials, and that it was long-lasting. They also said that the unit worked well as an air purifier. However, we noted that customers who gave this ozone generator negative reviews said the timer often did not function properly, while others said that it stopped working properly after only a few days or weeks of use.

Highest Ozone Output

Courtesy Amazon

Additional resources:
What are the three types of crushers?

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Enerzen Commercial Ozone Generator

• $99.95

Prices taken at time of publishing.

We like that this heavy-duty ozone generator is made from durable aluminum alloy with a powder coating that ensures it&#;s built to last. It can also cover up to 4,000 square feet, making it great for commercial use or as an odor eliminator for large areas.

• $99.95

  at

  Amazon

Pros and Cons

&#; Has a 20,000 mg/h output with adjustable fan speed
&#; Contains washable stainless-steel filter
&#; Weighs just 5 pounds

&#; May leave a strong smell after use
&#; Has fewer timer settings than some other generators

What Customers Are Saying

Our research showed that customers who were happy with this product said that it was made from sturdy materials, was highly effective in large spaces, and that it had a compact size but still produced powerful results. However, those who were unhappy with this ozone generator said that it left bad-smelling fumes well after it was no longer running, while others claimed that it was ineffective at deodorizing smells from cigarette smoke.

Best Decorative

Courtesy Amazon

Ivation Ozone Generator

• $149.99
• $159.99
• 6% off

Prices taken at time of publishing.

With an attractive cherry finish, we think this sleek ozone generator seamlessly blends in with other furniture you have in your home. It&#;s also highly effective, as the activated oxygen output can purify air for spaces up to 3,500 square feet while eliminating dust and odors from mildew, mold, food, tobacco, pets, and more.

• $149.99

  at

  Amazon

Pros and Cons

&#; Comes with a ceramic plate and an A/C adapter
&#; Has adjustable fan speeds
&#; Also works as an ionizer

&#; Cannot be shipped to California
&#; Heavier than many other generators

What Customers Are Saying

Customers who gave this product positive reviews on Amazon liked that it was effective at sanitizing tobacco smoke, had a strong power output, and had an attractive design. However, we saw some customers who gave negative reviews saying that this ozone generator was not long-lasting and that it was overly loud.

Buying Guide to Ozone Generators

While many ozone generators function similarly, there are notable differences. Consider these factors to make an educated decision and enjoy superior air quality in your home for years to come.

Type

Ozone generators use different operating mechanisms that affect qualities like ozone output, energy usage, and size. Our research showed that there are four primary types of ozone generators on the market: cold plasma, corona discharge, electrolytic, and ultraviolet.

Cold plasma

To split oxygen molecules and emit ozone, these ozone generators create an electric field using cold plasma. The cold plasma is created using two adjacent neon tubes. Though bulky, cold plasma ozone generators produce relatively little heat compared to other types of generators.

Corona discharge

A powerful and efficient ozone generation method, corona discharge involves splitting oxygen molecules with an electrical current. The current splits these molecules into single oxygen atoms, which instantly recombine to form ozone gas.

Electrolytic

Engineered to treat water, electrolytic ozone generators create ozone by pumping water into the generator, which splits the oxygen molecules.

Ultraviolet

Ultraviolet ozone generators are the least efficient and powerful. They work by emitting UV light to create ozone and split oxygen molecules. Ultraviolet ozone generators are typically suited for smaller spaces such as a bedroom.

Ozone output

An ozone generator with a higher output will sanitize larger areas like a basement in a shorter amount of time. Measured in milligrams per hour (mg/h), ozone generators may produce as little as 300 mg of ozone per hour, with industrial-sized models producing up to 12,000 mg of ozone per hour.

Size and weight

Most ozone generators are relatively compact and weigh less than 7 pounds&#;portable ozone generators can weigh less than a pound. This makes many ozone generators discreet, able to sit quietly in the corner of a room or even in a car interior. Large, commercial-grade ozone generators tend to be much heavier, albeit less common.

Maintenance

For optimal performance and extended lifespan, periodically clean the ozone plates inside of your unit. These plates are usually accessed easily in most ozone generators.

Controls

Most ozone generators have a fairly simple dial mechanism to control how long you want the unit to operate. The on/off switch should also be easy to locate and press. Additionally, your ozone generator should have a timer that automatically turns the unit off once it&#;s done emitting ozone.

Tips For Using an Ozone Generator

While using an ozone generator can be a highly effective way to eliminate harsh odors and rid your home of pollutants, they can cause damage if they are not used properly.

There are several important things you need to keep in mind when using an ozone generator, including:

Clear the room before use

Before using an ozone generator, you should make sure that the room in question is unoccupied. When people are exposed to ozone, it can cause respiratory problems, including throat and lung irritation.

It&#;s especially important that elderly people, pets, and children aren&#;t in a room when an ozone generator is running. You should also remove things like indoor plants.

Don&#;t run it longer than needed

Ozone generators typically need to run between 3-10 hours to be fully effective, depending on the size of the room. However, it&#;s better to undershoot that estimate and turn the generator back on for another run than to overestimate and leave it on too long. An ozone generator that&#;s been left on can leave a noxious odor that could cause irritation or illness and could last in the air for days or even weeks.

Always run your ozone generator in a well-ventilated space with minimum humidity to reduce the risk of leaving a noxious smell after use. Opening windows after the machine is done running can help dissipate the ozone faster.

Wait until it dissipates before re-entering

After an ozone generator runs, ozone can stay in the air for several hours, with a specific amount of time depending on the power level of the device and the size of the room.

Generally, a good rule of thumb is to wait at least four hours before reentering a room after using an ozone generator. If you need to manually turn off the device and it doesn&#;t have a timer setting, you should cover your nose and mouth before entering the room.

Frequently Asked Questions About Ozone Generators

Do ozone generators use a lot of electricity?

Compared to other household appliances, ozone generators don&#;t use very much electricity. You should also consider that you&#;re only operating your ozone generator as needed to clean the air in different areas of your home, which won&#;t be that often.

Are ozone generators safe for home use?

It&#;s important to note that ozone gas is a pollutant. This gas is harmful to your health, and exposure can produce coughing, chest pain, and respiratory issues. Make sure you and others, including pets, leave the area before operating your ozone generator.

To make this easy, ozone generators have timers that allow you to enter and exit the space without having to manually turn the unit on or off.

Can I use an ozone generator to &#;soften&#; water?

Do not use an ozone generator to remove calcium or other metallic elements in your water supply. While there are plenty of safe and effective options to soften water, an ozone generator will not remove calcium or substantially desalinate water.

What&#;s the difference between an ozone generator and an ionizer?

An ozone generator attaches to oxygen molecules for odor removal. Ionizers are designed to remove particulate matter in the air, such as dust or pollen. While ozone generators intentionally emit ozone, ionizers will emit lower ozone levels as a byproduct.

Why Trust The This Old House Reviews Team

This Old House has empowered homeowners for more than four decades with top-notch home improvement content in the form of television programs, print media, and digital content on its website and social media platforms. The This Old House Reviews Team focuses on creating in-depth product and service review content to help inform your purchasing decision for just about any item or resource that you might need for your home. The This Old House Reviews Team has written over 1,000 reviews on products in the home space, from cordless drills to kitchen trash cans, lawn mowers, and dining room decorations.

We recommend products in each review using an intensive research process, spending hours combing through the best available models on Amazon. For a product to make our list of top picks, it must hold a solid sales record on Amazon, have consistently positive customer reviews, and offer unique features, among other factors. After narrowing down our list of recommendations, we conduct additional research and sometimes in-person testing to ensure that the products meet our standards. Once we conclude the research phase, we craft a well-rounded, user-friendly article that includes our recommended products and additional information to help homeowners like you make the right purchase.

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