23AIRPOL Effects of Taebaek Mountains on the Spatial Distributions of PM10 and PM2.5 in Gangwon Province.

The purpose of this study is to statistically confirm that the Taebaek Mountains are one of the main causes of the spatial difference in the concentration of particulate matter between the westside(Yeongseo) and eastside(Yeongdong) of the Mountains, Gangwon province of the Korean peninsula. We investigate the effects of the Taebaek Mountains on the differences in the concentrations by analyzing the PM10 and PM2.5 concentration data, wind direction and speed data collected over the 7 years from 2015 to 2021 at the Yeongseo and Yeongdong regions. As a result, we demonstrate that wind direction and speed transporting PM10 and PM2.5 can be considered as a significant feature. When the concentrations are higher than normal, the reduction effect of PM10 by the Taebaek Mountains has much clear, while the PM2.5 has less effect. When the wind blows from the west to the east of the Taebaek Mountains, the wind speed may increase at the Yeongdong , and in those cases, the concentrations of PM10 and PM2.5 were much lower than at the Yeongseo. In addition, when wind blows across from the westside to eastside of the Mountains and the wind speed at Yeongseo exceeds 2 , the distribution range of high concentrations of PM10 and PM2.5 is narrower at Yeongseo and Yeongdong compared with the case of weaker wind speed.