| The main subject of this paper is the investigation on fine particulatematters—the aerodynamic diameter of which are less than 2.5μm. Thesekinds of PM are harmful for human health since their easy ingress anddepositing within the trachea. Began from the physical and chemiccharacteristics, origin and concentration of PM2.5, based on the principleof mass balance, the general model of indoor air quality(IAQ) within thenatural ventilation buildings, which adoptable not only for a single zonebut also for the multi-zone, was founded in this paper, and was used topredict IAQ that effected by the concentration of PM2.5.From two aspects of macroscopic(concentration vs. time) andmicrocosmic (concentration vs. diameter) respectively, the relationshipsbetween outdoor and indoor PM2.5 concentration, the interaction fromdifferent concentration from one zone to another and the contributionfrom indoor source (smoking, burning of coal, etc.) to the variety ofconcentration of PM2.5 were studies in this paper. During such studies theair exchange rate is considered to be a pivot. The COMIS model was usedin this paper in order to simulate the concentration varied from timewithin two rooms, and the same model was predicted by the IAQ model.Contrasted the results obtained from COMIS model and IAQ model, themethod developed by this paper was validated.
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