Indoor air quality tends to be the dominant contributor to personal exposure, because most people spend over 80% of their time indoors. In this study, indoor and outdoor NO2 concentrations were measured and compared with simultaneously personal exposures of 21 university students in weekday and weekend. House characteristics and activity pattern were used to determine the impacts of these factors on personal exposure. Since university students spent most of their times in indoor, their NO2 exposure was associated with indoor NO2 level rather than outdoor NO2 level both weekday and weekend in spite of different time activity. Using time-weighted average model, NO2 exposures of university students were estimated by NO2 measurements in indoor home, indoor school, and outdoor home levels. Estimated NO2 personal exposures were significantly correlated with measured NO2 personal exposures(r2=0.87). However, estimated personal NO2 exposures by time-weighted average model were underestimated, comparing with the measured personal NO2 exposure. Using multiple regression analysis, effect of personal NO2 exposure for transportation was confirmed.
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