역궤적 분석을 통한 춘천지역 장기간 PM₁₀과 PM_2.5 외부 유입 경로 및 기상요인 영향 분석

Analysis of the long-term PM₁₀ and PM_2.5 external inflow paths and meteorological factors in Chuncheon area through backward trajectory analysis

The purpose of this study is to analyze the effects of external inflow and meteorological factors on PM₁₀ and PM_2.5 concentrations in Chuncheon area for a long time. In Korea, various policies have been implemented to reduce air pollution, but the improvement in the concentration of air pollutants (O₃, SO₂, PM₁₀, PM_2.5, NO₂) in particular, O₃,, PM₁₀, PM_2.5, remained insignificant, and the concentration of ultrafine dust (PM_2.5) is still the highest among OECD member countries. In this situation, it is a very important task to accurately identify the cause of pollutant generation and increase in concentration. In this study, concentration analysis was conducted considering the effects of external inflow and weather, assuming that the causes of occurrence and increase of PM₁₀ and PM_2.5 in Chuncheon area were influenced by external inflow and weather. The effects of external inflow were evaluated using reverse trajectory analysis modeling, and the correlation between pollutant concentration and meteorological variables was presented for meteorological factors through statistical analysis. Through this, we tried to find out how much the concentration of air pollutants in Chuncheon in Korea is affected by external inflow and meteorological factors. Most of the reverse trajectory clusters at high concentrations were introduced from the west. In view of this, the high concentration of air pollutants in Chuncheon was mainly affected by the airflow introduced from the west. In the relationship between meteorological factors and concentration, wind speed showed a weak negative correlation with PM₁₀ and PM_2.5 concentration, and PM_2.5 was somewhat more strongly affected by wind speed. Humidity showed a weak negative correlation with PM₁₀, but a weak positive correlation with PM_2.5. Compared to Seoul, Chuncheon had a larger correlation, but it was confirmed that there was little effect of wind speed and wind direction on the concentration because it was weak or insignificant.