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CR doesn’t typically test electronic air purifiers nor recommend them because they can produce ozone. Ozone exposure might also worsen asthma, emphysema, and bronchitis.Įlectrostatic 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. 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. Plus, studies reviewed by the EPA have shown that low levels of ozone-the chief ingredient of smog-don’t effectively destroy indoor pollutants. 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. This can result in dangerous indoor air quality, and CR does not recommend these types of air purifiers. Ozone generators: These machines produce ozone, a molecule that can react with certain pollutants to alter their chemical composition. Make sure to budget for replacements accordingly: Activated carbon filters usually cost up to $50 each. 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. Because activated carbon filters don’t combat particles, many air purifiers will have both an activated carbon filter and a mechanical filter.

But they’re not particularly effective against formaldehyde, ammonia, or nitrogen oxide.

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.Īctivated carbon filters: Unlike mechanical filters, these filters use activated carbon to capture certain types of gases, including some odor-causing molecules. (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. 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. Filters with very fine mesh are called HEPA filters. Mechanical filters: These purifiers use fans to force air through a dense web of fine fibers that trap particles. Others are ineffective, or even potentially harmful to your health. But if you’re sitting next to a fireplace in the living room for extended periods of time, a room air purifier there may not be a bad idea.' A room air purifier may be worth it too, say, in a bedroom, if you sleep with your pet.ĭifferent air purifiers work using a range of technologies. Similarly, he says, 'a whole-house system will work at filtering all the air that passes through it via the HVAC system.

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While your house might feel sufficiently warm, you might have a particularly drafty room with old, poorly sealed windows placing a space heater there would make the room more comfortable.

Think of a room air purifier as a supplemental unit, like a space heater in the context of a whole-house heating system, explains Misha Kollontai, who oversees testing of air purifiers at Consumer Reports. They’re separate from whole-house air purifier systems and air filters, which are integrated into a home’s heating, ventilating, and air conditioning system and designed to clean the air in the entire house.

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Portable room air purifiers are designed to filter the air in a single room.