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There are several technologies air purifiers utilize for decreasing indoor pollution. Some work much better than others. And some can even be bad for your health.  clean air  with mechanical filters: This is the type that CR tests. Air cleansers with pleated filters utilize fans to require air through a dense web of fine fibers that trap particles.

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97 percent of particles of a particular size (0. 3 micrometers in diametersmoke and paint pigments, for example). HEPA filters can remove bigger particles, too, consisting of dust, pollen, and some mold spores, while they're suspended in the air. (Note that some filters identified "HEPA-type" or "HEPA-like" have actually not been licensed to fulfill the requirements of a true HEPA filter but may still carry out adequately in our tests.) When it comes to limitations, mechanical filters don't assist with gases or smells.

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Mechanical filters need to be replaced every 6 to 12 months; they can cost approximately $200 per filter but normally max out at $80. Models with activated carbon filters: Rather than catch particles like mechanical filters, sorbent filters utilize activated carbon that can capture some odor-causing particles from the air.

Since triggered carbon filters do not combat particles, numerous air cleansers will have both a triggered carbon filter and a pleated filter for capturing particles. Activated carbon gets saturated faster than a pleated filter, though, and requires replacement more frequentlyevery 3 months, rather than every 6 to 12 months for pleated filters.

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Ozone generators: These makers produce ozone, a particle that can respond with particular toxins to change their chemical composition. This can result in hazardous indoor air quality, and CR does not advise these types of air cleansers. Makers of ozone generators frequently declare that the devices release safe levels of ozone, but in the past, our tests discovered that even at low settings, some ozone generators quickly surpassed the Fda's limit of 0.

Plus, research studies examined by the EPA have actually shown that low levels of ozonethe chief active ingredient of smogdon't successfully ruin indoor pollutants. Research study likewise shows that ozone has actually been linked to reductions in lung function and increased risks of throat inflammation, coughing, chest discomfort, and lung tissue inflammation. Ozone exposure may also aggravate asthma, emphysema, and bronchitis.