Hazardous air pollutants such as NO2, VOCs and PM10 were measured Daegu, Korea in major micro-environments, where housewives spend the most of their time, and personal exposure times were estimated by using time activity patterns and exposure scenarios. The major microenvironments of housewives were selected using the ‘Time-Use Survey’ conducted by the National Statistical Office in Korea in 2009. A total of 4,514 (weekdays) and 3,063 (weekends) housewives were recruited for the ‘Time-Use Survey.’ It seems that housewives are spending about 80% of their time in the house, and about 5% of their time outdoors during weekdays and weekends. The indoor/ outdoor ratio of the average concentration of NO2 was more than 1, which indicated that the source was indoors. Toluene was shown to have higher concentrations indoors than outdoors. Ethylbenzene and xylene displayed similar characteristics to toluene, and the concentration ratio for indoor/outdoor was shown to be 1.29 ± 0.76 and 1.04 ± 0.45, respectively, higher concentrations indoors. Based on the results of the time activity patterns of participants, 3 kinds of exposure scenarios were formulated. The spent time and air concentration in each environment were assumed as normal and lognormal distribution, respectively. And then the Monte-Carlo simulation was conducted. According to the result of the simulation, the exposures to hazardous air pollutants revealed an increasing pattern as housewives visits other indoor environments such as supermarkets. Keywords : Time activity patter, Air pollutants, Exposure, Housewife