Where do these toxic vapors come from?

1) Inadequate ventilation is part of the problem

2. Some of the worst indoor air toxins, benzene, formaldehyde, and trichloroethylene come from common things in the building such as:
plastics
carpeting
upholstery
copy machines
inks
paint
detergents
pesticides
adhesives
manufactured wood products.

3. Biological contaminants such as pollen, mold, bacteria, and viruses that breed in the stagnant water that accumulates in humidifiers, ducts, ceilings, carpets, or tiles

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