Taking a breather from allergies

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An air purifier just may be the perfect gift this holiday season for someone suffering from allergies, says Dr. Ross Myerson, medical director of occupational and environmental health at Washington Hospital Center in Northwest.

People who have significant allergies to common indoor air contaminants, such as dust, mold spores and animal dander, may benefit from any number of devices that help clean the air, he says.

The devices "definitely remove particulates from the air," Dr. Myerson says. "They have varying efficiencies."

With so many air purifiers on the market, sometimes it's hard to tell what they do and whether they actually work. Many doctors agree, however, that most air purifiers can improve the quality of a home environment.

Sneezing, itchy eyes, runny nose and postnasal drip are symptoms suggesting someone might benefit from an air purifier, says Dr. Sonya Malekzadeh, associate professor of otolaryngology at Georgetown University Hospital in Northwest.

"If you see your doctor and they determine you have allergies, you should do environmental control," Dr. Malekzadeh says. "Avoid the things that you are allergic to. Get rid of carpeting. Put plastic covering on the bed. Change filters on the ducts every three months. Avoid sleeping with pets. At the same time, you can get filters that clear the air of the little particles."

High-efficiency particulate air (HEPA) filters are the most efficient air purifiers, she says. The filters were developed to capture 99.97 percent of particles 0.3 micrometers in diameter, such as pollen, dust mites, mold spores and animal dander, she says.

Many HEPA filters use carbon filters that remove larger particles, including odors and tobacco smoke. The machines come in different sizes to accommodate rooms of various sizes. The filter in the air purifier must be changed routinely, or the device won't work properly.

Electronic precipitators, another type of air cleaner, move air over electronically charged plates, she says. The plates change the charge of the particles and capture them. These machines do not use replaceable filters; instead, they must be cleaned regularly.

Most people don't need to run their air purifiers when they are away from their houses, she says. It's usually enough to run the machines when someone is home. It's best to put the devices in the bedroom, where people spend most of their time, she says. Because some air purifiers can be noisy, users should make sure the fan they are considering purchasing won't keep them awake at night.