In today’s urban environment, however, the presence of harmful chemicals, noxious gases and disease-carrying vermin can inadvertently transform our “Home Sweet Home” into a “black hole” that actually traps various forms of pollution and endangers unwary families.
Our homes can sustain toxic mold spores and volatile organic compounds emitted by paint, endangering our health. It can also shut in life-threatening dioxins released by a variety of sources such as cigarette smoke and some plastics.
Just how serious is the problem of indoor air pollution that many urban Filipino families seem to take for granted?
The government estimates that urban indoor and outdoor air pollution accounts for some five percent of all reported disease cases and four percent of all reported deaths in the Philippines.
In the USA, the American Medical Association reported that one-third of the national health bill sprang from causes directly attributable to indoor air pollution. In addition, the U.S. Environmental Protection Agency has consistently ranked indoor air pollution among the top five environmental risks to public health.
The invisible enemy
Indoor air pollution is probably the Filipino family’s most insidious—and least known—enemy.
The causes of indoor air pollution in urban residential homes are either natural (house dust mites, for example) or “anthropogenic” or man-made (e.g. cigarette smoke). While natural causes appear more ubiquitous, it’s the man-made causes that pose the greater threat to a family’s health and well-being.
“Dust mites are the main cause of urban indoor air pollution in the Philippines—but only if no one in the house smokes,” said Dr. Wency Kiat, a toxicologist and pediatrician at the St. Luke’s Medical Center in Quezon City.
Dr. Kiat is the only toxicologist at St. Luke’s and one of only 20 toxicologists in this country. As a toxicologist, his job is to study the harmful interactions among chemical, physical or biological agents and biological systems. He also studies the nature and effects of poisons and their treatment.
Up to 90 percent of all house dust is actually human dander. Scientists estimate the entire outer layer of our skin is shed everyday or two at a rate of seven million skin flakes per minute
Dust mites excrete enzymes to digest dander, their favorite food. They expel these enzymes in their feces, which become part of house dust. Dust mites abound in pillow cases, blankets, bed sheets, beds, furniture and carpets.
Poisonous cigarettes
In homes with cigarette smokers, however, the danger from secondhand smoke outweighs that from dust mites.
“Cigarette smoke is one of the most dangerous sources of indoor pollutants, especially for children,” he noted. “Children are the most vulnerable to secondhand or environmental tobacco smoke.”
As for dust mites, the problem they pose for Filipino families is their omnipresence and massive numbers that reach into the millions. Dust mites, more specifically their feces, are allergens known to trigger asthma and other allergic reactions when inhaled.
House dust heavily contaminated with dust mite feces is one of the most potent allergenic substances found indoors. Some 80 percent of asthma attacks are caused by dust mites. Dust mites can also cause eczema, hay fever and other allergic ailments.
“It’s all about the bed,” said Dr. Kiat referring to the dust mites’ favorite home.
He said that while dust mites may infest pillow cases and bed sheets, it’s the mattress that’s the main source of the asthmatic attacks and allergic reactions resulting from exposure to dust mites and their droppings. Scientists estimate that a mattress can harbor up to 10 million dust mites.
Dr. Kiat recommends cleaning mattresses every three to four months to curtail the spread of dust mites. Mattresses should be also be inverted every three to four months for the same reason.
Constant cleaning always
Constant cleaning is the best defense against dust mites and other pests such as roaches, Dr. Kiat believes.
He urges families to practice the “constant cleaning method,” that is, clean often, very often.
“Constant cleaning is hard at the start, but in the long-run it’s okay,” he pointed out.
When constant cleaning, you can either use water or water mixed with small amounts of bleach instead of disinfectants. Bleach evaporates much faster than disinfectants, which remain potent (and thus poisonous) for longer periods of time.
“Water is still the safest cleaner,” said Dr. Kiat.. “Avoid using chemicals, including disinfectants, when cleaning.”
He admitted it might be difficult for families accustomed to using strong bleaches and disinfectants to rely on water.
If there is a need to use a bleach in cleaning, however, follow the manufacturer's instructions to safely dilute the bleach in water.
But for Dr. Kiat, constant cleaning with water is to be preferred.
“If you have a clean home, why do you need to disinfect?”
Dangerous LPG
One of the most dangerous yet often overlooked sources of indoor air pollution is the kitchen, Dr. Kiat noted.
He singled out homes using liquefied petroleum gas (LPG) as particularly vulnerable to carbon monoxide poisoning. He urges LPG users to be constantly alert when using their LPG stoves or ranges.
The worst danger comes from the incomplete combustion of LPG. This inefficiency releases more carbon monoxide into the home. Carbon monoxide is the most lethal gas found in homes today.
“If the tip of the flame is persistently yellow, the flame liberates more carbon monoxide,” Dr. Kiat explained. “The flame should be bluish in color.”
Dr. Kiat warns that carbon monoxide is a colorless, odorless and tasteless poison that can kill quickly in closed (air conditioned) or improperly ventilated kitchens. He recommends opening the kitchen windows when burning LPG.
Tips for a safer indoors
Dr. Kiat gave these useful tips to make your indoor air healthier—and safer:
Practice constant cleaning to contain the health threat posed by dust mites and other household pests such as roaches, ants and rats.
When feasible, prefer natural air to air conditioned air.
Get rid of stuff you don’t need. A lot of clutter means a lot more insects, especially roaches. Unwanted stuff also traps a lot of indoor dust, which is mainly human dander that dust mites feed on.
If you must use an insecticide spray to get rid of mosquitoes or roaches, spray downwards towards the floor and not upwards towards the center of the room. This will limit the toxic danger present in any insecticide. Mosquitoes and roaches hide in dark places close to, or on the floor. Also, wear plastic gloves, goggles and a protective mask when spraying.
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