Every winter and spring, fine dust levels gets extremely high causing high levels of public anxiety and limiting daily life in Korea. The purpose of this study is to suggest how to improve urban building spaces and to present guidelines that reduce the exposures to fine dust in daily life. For this purpose, behavioral patterns of citizens should be examined first so that urban design factors can be defined which is related to fine dust matter. The site for research is ‘Multifunctional Administration City(hereinafter MAC)’, which is a newly developed city within Sejong City.