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Department of Urban and Environmental Engineering (Environmental Science and Engineering)Recently, particulate matter (PM) has been a great environmental concern in Korea due to long-range transport from China. However, the influences of local emission sources on concentrations and spatial distributions of PM are more important than those of long-range transport. In this research, study area was Ulsan, the largest industrial city in Korea. Thus, the atmospheric monitoring of PM emitted from industrial activities in this area is essential to be conducted to protect human health and establish environment policies. In this study, the PM data were obtained from automatic air monitoring stations established by the Ulsan Institute of Health & Environment (UIHE). PM10 monitoring stations were operated at fourteen (except for one station of road-side) sites, whereas PM2.5 monitoring stations were operated at six sites among them. However, the PM10 stations were not evenly distributed, it could not represent the overall air quality of Ulsan. It was required to adopt effective management plans like establishment, movement, and abolition. Therefore, we used Inverse Distance Weighted (IDW) for assessing the priority of PM10 air pollution monitoring stations of Ulsan. The hourly data of PM concentrations at six monitoring stations were also used to understand the concentration changes of PM10 and PM2.5 simultaneously for 2 years from 2015 to 2016. In the assessment of PM10 monitoring stations, Yaeum and Sinjeong stations were necessary measurement sites. As a result of correlation analysis between PM10 and PM2.5 seasonally, the correlation coefficients were high in summer and winter due to the effects of the southeastern and northwestern winds, respectively. The seasonal variations of PM10 and PM2.5 were higher in the spring (mean: 55.78 ??g/m3, 28.05 ??g/m3) and winter (mean: 45.88 ??g/m3, 25.15 ??g/m3) due to yellow dust events from China and increases in fossil fuel combustion, respectively. The weekly variations of PM10 and PM2.5 were high on weekdays (mean: 45.34 ??g/m3, 24.50 ??g/m3) in 2015 and weekends (mean: 46.77 ??g/m3, 24.40 ??g/m3) in 2016. Basically, the concentrations of PM on the weekday is higher than the weekend due to traffic volume, however, yellow dusts from China also had influence on the pollution of Ulsan in 2016. This can be an explanation for the high concentrations of PM on weekends in 2016. Regard to hourly variations of PM10 and PM2.5 concentrations, both showed high levels at 9-11am due to rush hour. On the other hand, the reduction of traffic load during 5-6am caused the low level of PM10. Besides, the concentrations of PM2.5 at 3-4pm were very low due to the diffusion within the maximum mixing height. The highest concentrations of PM10 and PM2.5 were recorded at the Hwasan station (mean: 54.23 ??g/m3, 26.23 ??g/m3, respectively) due to petrochemical and non-ferrous industrial activities. The lowest levels of PM10 and PM2.5 were measured at the Samnam station (mean: 38.73 ??g/m3, 22.62 ??g/m3, respectively) which is located in residential area. As a result of source identification at each station using the pollution rose of PM concentrations, wind fields, and emission sources provided by Clean Air Modeling System (CAPSS) all monitoring stations were related to industrial activities and traffic volume. Therefore, it was concluded that vehicles and industrial complexes might be the major sources of PM in Ulsan.ope