Air Quality - Texas Central Air

Air Quality and Its Effects On Allergies, Asthma and Your Health

Mold and Indoor Air Quality is a big concern in the 21st Century.

Indoor Air Quality Concerns

In the last several years, a growing body of scientific evidence has indicated that the air, within homes and other buildings, can be more seriously polluted than the outdoor airr, in even the largest and most industrialized cities. Other research indicates that people spend approximately 90 percent of their time indoors. Thus, for many people, the risks to health may be greater due to exposure to air pollution indoors than outdoors.

In addition, people who may be exposed to indoor air pollution, for the longest periods of time, are often those most susceptible to the effects of the indoor air pollution. Such groups include the young, the elderly, and the chronically ill, especially those suffering from respiratory, cardiovascular diseases or any type of contact allergy.

Indoor Air Quality in Your Home

What Causes Indoor Air Problems?

Indoor pollution sources, that release gases or particles into the air, are the primary cause of indoor air quality problems in homes. Inadequate ventilation can increase indoor pollution levels, by not bringing in enough outdoor air to dilute emissions from indoor sources and by not carrying indoor air pollution out of the home. High temperature and indoor humidity levels can also increase concentrations of some pollutants.

Pollution Sources

There are many sources, of indoor air pollution, in any home. These include combustion sources such as oil, gas, kerosene, coal, wood, and tobacco products; building materials and furnishings as diverse as deteriorated, asbestos-containing insulation, wet or damp carpet, and cabinetry or furniture made of certain pressed wood products; products for household cleaning and maintenance, personal care, or hobbies; improperly serviced central heating and cooling systems and humidification devices; and outdoor sources such as radon, pesticides, and outdoor air pollution.

The relative importance, of any single source, depends on how much of a given pollutant it emits and how hazardous those emissions are. In some cases, factors such as how old the source is and whether it is properly maintained are significant. For example, an improperly adjusted gas stove can emit significantly more carbon monoxide than one that is properly adjusted.

Some sources, such as building materials, furnishings, and household products like air fresheners, release pollutants more or less continuously. Other sources, related to activities carried out in the home, release pollutants intermittently. These causes of indoor air pollution include smoking, the use of unvented or malfunctioning stoves, furnaces, or space heaters, the use of solvents in cleaning and hobby activities, the use of paint strippers in redecorating activities, and the use of cleaning products and pesticides in housekeeping. High pollutant concentrations can remain, in the air, for long periods after some of these activities.

Amount of Ventilation

If too little outdoor air enters a home, indoor air pollution can accumulate to levels that can pose health and comfort problems. Unless they are built with special mechanical means of ventilation, homes that are designed and constructed, to minimize the amount of outdoor air that can "leak" into and out of the home, may have higher indoor air pollution levels than other homes. However, because some weather conditions can drastically reduce the amount of outdoor air that enters a home, indoor air pollution can build up, even in homes that are normally considered "leaky."

How Does Outdoor Air Enter a House?

Outdoor air enters and leaves a house by: infiltration, natural ventilation, and mechanical ventilation such as air conditioning systems. In a process known as infiltration, outdoor air flows into the house through openings, joints, and cracks in walls, floors, and ceilings, and around windows and doors. In natural ventilation, air moves through opened windows and doors. Air movement associated with infiltration and natural ventilation is caused by air temperature differences between indoors and outdoors and by wind. Finally, there are a number of mechanical ventilation devices, from outdoor-vented fans that intermittently remove air from a single room, such as bathrooms and kitchen, to air handling systems, like air conditioning, that use fans, filter systems and duct work to continuously remove indoor air and distribute filtered and conditioned outdoor air to strategic points throughout the house. The rate at which outdoor air replaces indoor air is described as the air exchange rate. When there is little infiltration, natural ventilation, or mechanical ventilation, the airr exchange rate is low and indoor air pollution levels can increase.

Improving the Air Quality in Your Home

Indoor Air and Your Health

Health effects, from indoor air pollution may be experienced soon after exposure or, possibly, years later.

Immediate effects may show up after a single exposure or repeated exposures. These include irritation of the eyes, nose, and throat, headaches, dizziness, and fatigue. Such immediate effects are usually short-term and treatable. Sometimes the treatment is simply eliminating the person's exposure to the source of the pollution, if it can be identified. Symptoms of some diseases, including asthma, hypersensitivity pneumonitis, and humidifier fever, may also show up soon after exposure to some indoor air pollutants.

The likelihood of immediate reactions, to indoor air pollutants, depends on several factors. Age and preexisting medical conditions are two important influences. In other cases, whether a person reacts to a pollutant depends on individual sensitivity, which varies tremendously from person to person. Some people can become sensitized to biological pollutants, like black mold, after repeated exposures, and it appears that some people can become sensitized to chemical pollutants as well.

Certain immediate effects are similar to those from colds or other viral diseases, so it is often difficult to determine if the symptoms are a result of exposure to indoor air pollution. For this reason, it is important to pay attention to the time and place the symptoms occur. If the symptoms fade, or go away, when a person is away from the home and return when the person returns, an effort should be made to identify indoor air sources that may be possible causes. Some effects may be made worse by an inadequate supply of outdoor air or from the heating, cooling, or lack of humidity control.

Other health effects may show up either years after exposure has occurred or only after long or repeated periods of exposure. These effects, which include some respiratory diseases, heart disease, and cancer, can be severely debilitating or fatal. It is prudent to try to improve the indoor air quality, in your home, even if symptoms are not noticeable.

While pollutants commonly found in indoor air are responsible for many harmful effects, there is considerable uncertainty about what concentrations, or periods of exposure, are necessary to produce specific health problems. People also react very differently to exposure to indoor air pollutants. Further research is needed to better understand which health effects occur after exposure to the average pollutant concentrations, found in homes, and which occur from the higher concentrations that occur for short periods of time.

Identifying Air Quality Problems

Some health effects can be useful indicators of an indoor air quality problem, especially if they appear after a person moves to a new residence, remodels or refurnishes a home, or treats a home with pesticides. If you think that you have symptoms that may be related to your home environment, discuss them with your doctor or your local health department to see if they could be caused by indoor air pollution. You may also want to consult a board-certified allergist or an occupational medicine specialist for answers to your questions.

Another way to judge whether your home has or could develop indoor air problems is to identify potential sources of indoor air pollution. Although the presence of such sources does not necessarily mean that you have an indoor air quality problem, being aware of the type and number of potential sources is an important step toward assessing the air quality in your home.

A third way to decide whether your home may have poor indoor air quality is to look at your lifestyle and activities. Human activities can be significant sources of indoor air pollution. Finally, look for signs of problems with the ventilation systems, in your home. Signs that can indicate your home may not have enough ventilation include moisture condensation on windows or walls, smelly or stuffy air, dirty central heating and air cooling equipment, and areas where books, shoes, or other items become moldy (see www.epa.gov/mold). To detect odors in your home, step outside for a few minutes, and then upon reentering your home, note whether odors are noticeable. If so, a good odor removalsystem should be put into place. Most licensed air conditioning contractors can help you to ascertain which type of air purifier or air filtration system, is right for you.

Measuring Pollutant Levels

The federal government recommends that you measure the level of radon in your home. Without measurements there is no way to tell whether radon is present because it is a colorless, odorless, radioactive gas. Inexpensive devices are available for measuring radon. EPA provides guidance as to risks associated with different levels of exposure and when the public should consider corrective action. There are specific mitigation techniques that have proven effective in reducing levels of radon in the home.

For pollutants other than radon, measurements are most appropriate when there are either health symptoms or signs of poor ventilation and specific sources or pollutants have been identified as possible causes of indoor air quality problems. Testing for many pollutants can be expensive. Before monitoring your home for pollutants besides radon, consult your state or local health department or professionals who have experience in solving indoor air quality problems in non-industrial buildings, such as an air conditioning contractor, most of which specialize in air purification systems, also. An air technician, can recommend an appropriate air purification system, for your home.

Weatherizing Your Home

The federal government recommends that homes be weatherized, in order to reduce the amount of energy needed for heating and home cooling. While weatherization is underway, however, steps should also be taken to minimize pollution from sources inside the home. (See "Improving the Air Quality in Your Home" for recommended actions.) In addition, residents should be alert to the emergence of signs of inadequate ventilation, such as stuffy air, moisture condensation on cold surfaces, or mold and mildew mold growth (see www.epa.gov/mold). Additional weatherization measures should not be undertaken until these problems have been corrected.

Weatherization generally does not cause

indoor air problems, by adding new pollutants to the air. (There are a few exceptions, such as caulking, that can sometimes emit pollutants.) However, measures such as installing storm windows, weather stripping, caulking, and blown-in wall insulation can reduce the amount of outdoor air infiltrating into a home. Consequently, after weatherization, concentrations of indoor air pollution, from sources inside the home, can increase.

Three Basic Strategies

Source Control

Usually the most effective way to improve indoor air quality, is to eliminate individual sources of pollution or to reduce their emissions. Some sources, like those that contain asbestos, can be sealed or enclosed; others, like gas stoves, can be adjusted to decrease the amount of emissions. In many cases, source control, among all the air systems, is also a more cost-efficient approach to protecting indoor air quality than increasing ventilation because increasing ventilation can increase energy costs.

Ventilation Improvements

Another approach to lowering the concentrations of indoor air pollutants, in your home, is to increase the amount of outdoor air coming indoors. Most homeheating and cooling systems, including forced air heating systems, do not mechanically bring fresh air into the house. Opening windows and doors, operating window or attic fans, when the weather permits, or running a window air conditioner with the vent control open increases the outdoor ventilation rate. Local bathroom or kitchen fans that exhaust outdoors remove contaminants directly from the room where the fan is located and also increase the outdoor air ventilation rate.

Most new central a c systems use high-grade air filters act as an air purifier.

For more information contact us1-888-531-2829.

If you suspect that you may have toxic mold, in your home, contact:

Texas Department of State Health Services
Division for Regulatory Services
Indoor Air Quality Program, MC #1987
1100 W. 49th Street
Austin, TX 78756
www.dshs.state.tx.us/iaq/default.shtm
Call toll-free at 1-800-293-0753 ext. 2444 or 2428
General Fax: (512) 834-6707

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