Some of the most dangerous air you breathe isn't emerging from a factory smokestack or a car exhaust pipe: It's in your home. In various amounts and concentrations, you might be getting formaldehyde from plywood and other building materials, stryrene and benzene from carpets, asbestos from ceiling tiles and flooring, carbon monoxide and nitrogen dioxide from kitchen appliances and infectious bacteria and fungi from heating and cooling systems. In all, the average home has upward of 200 different air contaminants.
Talk about being homesick! Breathing these substances day after day can leave you with any of a host of ails: headache, nausea, throat or eye irritation, dizziness and fatigue as well as wheezing, sneezing, coughing and other symptoms that mimic colds, flu or hay fever. Some contaminants are even suspected of causing cancer. While it can cost thousands of dollars to "cure" a building of sick building syndrome--depending on the size of the building and severity of the problems--here are some less expensive ways to help protect yourself from ailments caused by contaminants blowing through your home.
Take a lesson from the Japanese. "Dust causes more environmental problems than any other single source, and most of the dust tracked into your home is carried in on your shoes," says Lance Wallace, Ph.D., environmental scientist at the Environmental Protection Agency Office of Research and Development in Warrenton, Virginia. "So taking off your shoes at the front door is a good way to eliminate a lot of the dust in your home that you're breathing. If you aren't going to take off your shoes at the front door, then at least use a welcome mat. In tests we conducted, we found that wiping your feet on a welcome mat eliminates a lot of dust, although not nearly as much as removing your shoes."
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Decorate with houseplants. Studies by Bill Wolverton, Ph.D., president and research director of Wolverton Environmental Services, a research and consulting firm in Picayune, Mississippi, show that many low-light houseplants reduce levels of benzene, formaldehyde and other contaminants, because these plants use airborne toxins as a source of food. After taking in the toxin-containing air, the plant then returns cleaner air to your home.
Generally, you need a minimum of one plant for every 100-square-foot (average-size) room, says Dr. Wolverton. Among the most environmentally efficient (and easiest to maintain) are bamboo, areca and other palms, peace lily, English ivy, Boston fern, corn plants, chrysanthemums and philodendron.
But make sure the plant soil is "clean." Use good-quality commercial potting soil for houseplants. "You have to make sure the soil is clean and there are no bugs or growth in it, because contaminated soil can release contaminants into the air," says Richard Silberman, technical supervisor for Healthy Buildings International, a Fairfax, Virginia-based company that diagnoses sick buildings.
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Don't use air fresheners. Commercial air fresheners do nothing to freshen the air. "In fact, they're a big source of added indoor air pollution," according to Dr. Wallace. "Most fresheners contain chemicals that have been found to cause cancer in animals. Rather than removing odors, they just make if, impossible to smell them. And it's not just aerosols that are dangerous. In tests, the solid air fresheners were found to have high concentrations of some of the nastier chemicals."
And you can't assume that air "disinfectants" are much better. "They are really nothing more than pesticides that smell good," adds Dr. Wallace. "And you certainly don't want to breathe pesticides all day."
Let your house breathe. Being energy-efficient is one thing; sealing off your house completely is another. "We've removed a lot of our homes natural ventilation by tightening things up to save on fuel," says Thomas Godar, M.D., chief of the Pulmonary Disease Section at St. Francis Hospital and Medical Center in Hartford, Connecticut. "A tight house with a lot of insulation is like a closed box."
So open things up a little--use exhaust fans in the kitchen and bathrooms whenever possible. While storm windows and weather stripping will reduce energy costs, they can also seal off fresh air if your home is newer and built to be energy-efficient. So leave a window or two open just a crack, even in winter, if you have a newly built, completely insulated home.
Ban all smoke from your home. Cigarette smoke contains more than 4,000 different chemicals, including benzene, formaldehyde and carbon monoxide--possible culprits in sick building syndrome. So breathing cigarette smoke even secondhand smoke--is bad enough. "But if you have radon or asbestos in your home--and nearly every home has radon--then you're getting even worse damage from it if there's a smoker in your house," says Dr. Wallace. "That's because radon and asbestos attach to the smoke particles you're breathing into your lungs, so you get a bigger dose than you normally would."
Leave the house after you clean it. You're probably exposed to a lot of dust--and indoor air pollution--when you're cleaning house. "That's because vacuuming picks up only maybe 15 percent of the dust," says Dr. Wallace. "Much of the dust goes right through the vacuum bag and hangs in the air for several hours." His advice: "Do your housecleaning immediately before you leave. That way, you won't be subjected to all that flying dust."