Indoor air pollution is a serious problem. In some buildings with a lack of proper ventilation, the indoor air may be 100 times more polluted than the air outside! Air purifiers eliminate allergens, toxic chemicals, and other dangerous pollutants. This article explains why people use air purifiers, how they work, which air purifiers you should avoid, and how to select the Air Purifiers for your needs.
Common Indoor Air Pollutants
What is the source of indoor air pollution? VOCs can enter the air through chemical off-gassing from furniture, new carpets, adhesives, plastics, and various building materials. How Air Purifiers Work
HEPA air purifiers use a HEPA air filter, which was developed by the Atomic Energy Commission in the 1940s as a way to filter radioactive contaminants. HEPA filters set the standard for air purifiers: to be classified as HEPA, a filter must capture a minimum of 99.97% of pollutants at 0.3 microns or larger. Top-selling HEPA air purifiers include the Austin Air purifier, available with a HEGA (High Efficiency Gas Adsorption) filter, along with air purifiers from IQAir, Allerair, Blueair, and Honeywell.
Activated carbon filters remove gases, odors, and chemical toxins. The Friedrich air purifier is, by far, the best electrostatic air purifier, as well as the overall top-ranked air purifier in previous Consumer Reports rankings
Charged media filters give pollutants an electrostatic charge before collecting them in a traditional filter. Charged media filters are typically quite effective, but like electrostatic filters, they lose efficiency rapidly-and they may require frequent and expensive filter changes. Some charged media air filter units also emit ozone. The advantage of charged media filters is that they are quieter and more energy-efficient than HEPA air purifiers. The Blueair air purifier is the best charged media filter, and it does not emit ozone.
Where and How to Use an Air Purifier
If you suffer from allergies (especially if you’re allergic to dust mite allergen), then the best place for an air purifier is your bedroom. You should run your air purifier continuously for optimum performance. Most air purifiers have high and low settings. Even if you go on vacation, we recommend that you keep your air purifier running on low. Otherwise, you’ll return to a house full of polluted air! If you are concerned about your electric bill, find out how much energy an air purifier uses before buying it. Typical HEPA air purifiers can use anywhere from 50 watts on low to 200 watts on high. Air Purifiers to Avoid
Avoid ozone generators and ionizing air cleaners. These air purifiers create ions that attract pollutants; however, many of the pollutants are released back into the air, often times leading to dirty spots on nearby walls. Besides the fact that they don’t do a good job of cleaning the air, ozone generators and ionizing cleaners also emit ozone. Consumer Reports points out: “Our air-cleaning tests show that the Ionic Breeze with OzoneGuard does a poor job of removing smoke, dust and pollen particles from the air when new and after 500 hours of continuous use” and “the Ionic Breeze with OzoneGuard still adds ozone to the air.”
How to Buy the Best Air Purifier
The air purifier market is vast and riddled with confusing and often misleading advertising schemes. You may also want to consider the following factors before buying an air purifier: the area coverage (make sure the square footage listed for the air purifier is about the same or slightly greater than the square footage of the room where you intend to use it); the ACH rating (Air Changes Per Hour-this number lets you know how frequently the air purifier can exchange all the air in a given room); the CADR (the Clean Air Delivery Rate tells you how much air is purified and how well it is purified); the price; how often you have to replace the filters and how much they cost; the noise level of the air purifier; energy usage; whether it emits ozone; extra features (like a filter change indicator light); the manufacturer’s reputation; and the warranty.
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