The increased PM2.5 concentrations have become a serious environmental issue in South Korea. However, few studies have been conducted to examine the Physico-chemical properties of the polluted PM2.5. In the present study, the fine particles (PM2.5) were collected using quartz filter samples at a Seosan monitoring site between the period of 15 December 2020 - 15 January 2021 for the winter campaign, and 1 June 2021 - 30 June 2021 for the summer campaign to investigate Physico-chemical properties of high PM2.5 (≥ 35 μg/m3). Using all available datasets, we investigated phase states of the polluted PM2.5 and our results showed that the aerosol particles were observed in liquid, and (semi) solid states over the atmospheric relative humidity in winter and summer seasons. Furthermore, we observed core-shell morphology from most of the particles that were consisted of organic matters in the outer phase and inorganic salts in the inner phase.

Observation of phase states of high PM2.5 during winter and summer campaigns in South Korea

ACS Spring 2022

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