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Start Over Author "Seogju Cho" Journal asian journal of atmospheric environment
2 results on '"Seogju Cho"'

1. A Box-Model Simulation of the Formation of Inorganic Ionic Particulate Species and Their Air Quality Implications in Republic of Korea

Author

Haeju Lee, Dongwan Kim, Minseung Yeo, Yusin Kim, Chang Hoon Jung, Seogju Cho, Ji Hoon Park, Hye Jung Shin, and Sung Hoon Park

Subjects
Atmospheric box model, Inorganic ionic species, Secondary particulate matter, Nitrate, Gas-to-particle conversion, Environmental technology. Sanitary engineering, TD1-1066, Environmental sciences, GE1-350
Abstract

Abstract The Observation-Constrained Atmospheric BOX model (OCABOX) was used to analyze the formation of secondary inorganic PM species in the Seoul Metropolitan Area (SMA), South Korea. The measurement data of the ionic components of PM2.5 and their gaseous precursors made at the Olympic Park ground site (37.53°N, 127.12°E) during the Korea-United States Air Quality field campaign were used to run OCABOX in observation-based mode and compare the simulation results. The use of the HNO3 concentrations measured at a marine background site as the boundary conditions appeared to increase the accuracy of the model prediction of HNO3 and particulate NO3− concentrations. For the primary precursors emitted considerably throughout the SMA, such as NOx and NH3, using the data measured inside the SMA as the boundary conditions could lead to more accurate predictions. OCABOX was shown to be a reliable tool to analyze the formation of secondary inorganic aerosol in the SMA if used with appropriate regional background concentrations and observation-based constraints

Published
2022
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2. Status of Ambient PM2.5 Pollution in the Seoul Megacity (2020)

Author

Yong-Seung Shin, Seogju Cho, Jung-Hoon Uhm, Jun-Hyuk Ahn, Yongsuk Choi, Eun-Han Kwon, Il-Sang Bae, Ji-Hye Seong, Young-Jun Kim, and Hyeji Ju

Subjects
Pollution, Atmospheric Science, media_common.quotation_subject, Air pollution, Atmospheric sciences, medicine.disease_cause, complex mixtures, Environmental technology. Sanitary engineering, CAMX, contribution, chemistry.chemical_compound, camx, medicine, Nitrogen dioxide, GE1-350, Precipitation, Air quality index, TD1-1066, General Environmental Science, media_common, Pollutant, Environmental sciences, Megacity, chemistry, Environmental science, pm2.5, seoul
Abstract

The Center for Air Quality &Control at the Seoul Research Institute of Public Health and the Environment (SIHE) has monitored changes in the concentration of fine dust in Seoul over the past 10 years and investigated meteorological factors as well as fine particulate matter (PM2.5), sulfur dioxide (SO2), and nitrogen dioxide (NO2) concentrations in northeastern China and its contribution to the PM2.5 concentration in Seoul. The concentration of fine dust in Seoul in 2020 was 21 µg/m3, which is down 16% from 2019 and the lowest since 2010. In 2020, China’s emissions of pollutants such as NO2 have decreased significantly due to regional blockades, social distancing, and factory shutdowns caused by COVID-19. As a results, the concentration of precursors such as SO2 and NO2, and PM2.5 in northeastern China are also decreased, which contributed to the reduction in PM2.5 concentration in Seoul caused by westerly winds blowing. In addition, the ratio of east and south winds that usually contain low concentrations of pollutants was more than 30% of the total air currents into Seoul, which is the highest in the last three years. Moreover, the mean wind velocity and the amount of precipitation were also the highest recorded values of 2.4 m/s and 1651.0 mm, respectively. Calculations using Comprehensive Air quality Model with eXtensions (CAMx)-Particulate Source Apportionment Technology (PSAT) show that the contribution of external inflows to the PM2.5 concentration in Seoul was 65%. We believe that the reasons for the low PM2.5 concentration in 2020 are due to meteorological factors and a decrease in air pollution in northeastern China. Meanwhile, the major contribution of emissions in Seoul (resuspended road dust and non-exhaust dust) was high. When the concentration of PM2.5 was high, the contribution of resuspended road dust was reduced due to an increase of secondary generating materials. Currently, data on emission reduction due to the COVID-19 cannot be assessed, which we believe will enable more accurate contribution calculations in the future. © 2021

Published
2021

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