*Dust mites and insects
*Dander from cats and dogs
*Fungi spores, molds, pollens and other allergen bearing particles

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Public response to the need for energy efficiency, has made contractors and builders to concentrate on building airtight homes and offices. New homes and offices are being built utilizing:

*Increased airtight construction
*Improved insulated doors and windows
*Higher insulation R values
*High efficiency heating and air conditioning equipment

Homes and buildings built prior to 1985 have a natural leakage that occurs due to the nature of the construction. Much of the pollutants that build up in these buildings usually would be diluted through unsealed areas.

The qualities of good indoor air include:

*Introduction and distribution of adequate ventilation air
*Control of airborne contaminants
*Maintenance of acceptable temperature and humidity
*Filtration of indoor air

When grouped together in a poorly ventilated area, office machines, furnishings and even the seemingly innocent supplies in your desk drawer can emit a combination of pollutants strong enough to make your head ache, eyes water and throat itch. Here are some prime offenders and their possible effects:

Coping machines and electrical equipment

Cleaning supplies such as floor wax, carpet deodorizers and air fresheners

Cigarette smoke, new carpeting and furnishings, insulation and window coverings

Poorly maintained heating and cooling systems

Microbes such as mold and fungi

Prolonged exposure to dirty air can needlessly plague with skin irritations, respiratory problems and other chronic ailments. Radon or asbestos entering through cracked foundation or ceiling can lead to cancer or other diseases. A recent study from the American Medical Association found that people who live in modern buildings come down with respiratory infections 45% more than those who live in older structures.