The inhalation region discussed in section 3.2.2 is a portion of air inhaled by an occpant. The product of the concentration and the portion of the air inhaled can be an index of the virtual health effects of the contaminant at the designated point.corresponding to the index IECV ,we defined another index showing the effects of contaminant inhalation, IECI , using the product of the concentration of contaminants in the air