People are exposed to air pollution from a range of indoor and outdoor sources. Concentration of nitrogen dioxide (NO2), which is hazardous to health, can be significant in both types of environment. This paper reports on the measurement and analysis of indoor and outdoor NO2 concentrations and their comparison with measured personal exposure in house and workplace indoors with 28 office workers during winter and summer seasons. Time activity patterns were used to determine the effects of these factors on personal exposure. The residential indoor and office indoor times were 12.29?.58, 7.86?.97 hours in winter and 11.04?.18, 8.26?.04 hours in summer, respectively. Measured residential indoor, outdoor and office indoor, personal exposure NO2 concentrations were 23.10?.46 ppb, 23.97?.86 ppb, 21.91?1.50 ppb, 22.08?.64 ppb in winter, and 19.94?.04 ppb, 21.21?.84?ppb, 22.55?.54 ppb, 27.45?.96 ppb in summer, respectively. Contributions of residential and office indoor NO2 concentration on personal exposure were estimated by 57.98%, 35.62% in winter and 37.38%, 28.97% in summer, respectively.