In this study, we estimated nitrogen dioxide (NO2) concentrations in microenvironments where residential indoor, residential outdoor, other indoors, and transportation using measured personal exposure and multiple linear regression analysis of time-weighted average model, and compared with measured NO2 concentration in microenvironments. Measured residential indoor, outdoor and other indoor NO2 concentration was 22.22±9.59 ppb, 23.64±9.62 ppb, and 22.07±13.90 ppb, respectively. NO2 concentrations in residential indoor and outdoor, total outdoor, other indoor, and transportation by multiple regression analysis were significantly estimated as 20.48 ppb, 32.79 ppb, 24.35 ppb, and 28.82 ppb, respectively (p= 0.000). Measured and estimated NO2 concentration were similar with each other, therefore NO2 concentrations in each microenvironment were able to be estimated using time-weighted average model and personal exposure with multiple regression analysis. Keywords：Nitrogen dioxide, microenvironment, time-weighted average model, indoor air quality, personal exposure