الفهرس 
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Abstract
Studying indoor air quality (IQA), its effects on occupants, interchange of air pollutants between indoor and outdoor environments, and building up regression models to enumerate the indoor-outdoor relationship are now interesting subjects for researchers working in the field of occupational hygiene. Several factors affect indoor air quality. These factors comprise the source and magnitude of indoor air pollutants (indoor or outdoor), ventilation technique used (natural or mechanical), pollutant pathways and driving forces, and characteristics of building and pollutants. The aim of the present study was to assess the indoor and outdoor relationship of air pollutants, and to quantify the effect of external pollution level on indoor air quality in office buildings, and finally to accurately predict the indoor pollutant concentration through formulation of mathematical models including all predisposing factors. Four pollutants were selected for the present study. These pollutants were total suspended particulates (TSP), sulfur dioxide (SO2), nitrogen dioxide (NO2), and carbon monoxide (CO). Also, three different locations were selected (A, B, and C). The data were collected from location A for about one year. Ninety percent of these data were used for model building, and the other ten percent in addition to 10