Oxygen is the major nutrient required by the body, some 800 liters per day. A partial lack of oxygen (hypoxia) will cause major disease problems over time, and a total lack of oxygen (anoxia) will result in brain damage in four minutes, and death in seven minutes.
Many people spend large portions of time in doors – as much as 80-90% of their lives. We work, study, eat, drink, and sleep in enclosed environments where air circulation may be restricted. For these reasons, some experts feel that more people suffer from the effects of indoor air pollution than outdoor pollution.
Pollution exposure at home and work is often greater than outdoors. The California Air Resources Board estimates that indoor air pollutant levels are 25-62% greater than outside levels and can pose serious health problems.