Many are not only concerned with the quality levels of air pollution outdoors but also indoors. It is true that a major concern of society should be that of the quality of outside air (ambient air quality, AAQ) but indoor air quality (IAQ) is often much poorer than that of the outdoor. One reason for this is that people generally spend the majority of their time in an indoor environment which often have higher concentrations of air pollutants. These higher concentrations can contribute to detrimental health effects by irritating and or deteriorating ones respiratory functions. Those whom are most affected by poor IAQ are sensitive groups such as those with allergies, lung disease, asthma, etc.

Causes of Poor IAQ

IAQ often deteriorates when there is poor air circulation and ventilation in a home. Poor ventilation causes indoor air pollution to reach higher concentrations since it is difficult for the highly concentrated air to be diluted by outdoor air. Main contributors to poor IAQ:

Heaters and fireplaces: wood, oil, gas, kerosene
Central heating/cooling systems and humidification devices
Smoking
Biological: allergens (pet dander, mites, pollens, dust, mold, etc.)
Household cleaning supplies
Building materials and furnishings: asbestos, specific pressed wood products, etc…
Outdoor air pollution, radon, and pesticides