Indoor air quality facts show that most people spend 75-90% of their time indoors.
Exposure to airborne contamination is considerable. 50% of all major office buildings have contaminated heating, ventilation and air conditioning systems (HVAC). If not properly maintained, they are a hotbed for growth of molds and bacteria.
More indoor air quality facts: Each person inhales over 13 cubic meter of air each day. Children inhale more particles for their size then adolescents or adults. Polluted air causes 94% of all respiratory problems. About 40,000 dust mites, a common household allergen, can live in one ounce of dust. An estimated 10-15% of the entire population may be allergic to cat or dog dander. A person sheds up to 700,000 skin flakes per day.