Lim, Yong Bin Seo, Jihoon Kim, Jin Young Kim, Yong Pyo Jin, Hyun Cher 2024-01-19T17:02:27Z 2024-01-19T17:02:27Z 2021-09-02 2020-08 1748-9326 https://pubs.kist.re.kr/handle/201004/118340 Urban particle pollution is affected by not only the emissions of pollutants and secondary aerosol formation through atmospheric chemistry on a local scale, but also the regional transport of particles and precursor gases from highly polluted upwind areas. However, this regional impact on urban particle formation is not well understood. Wintertime haze events occur at Seoul, Korea through the combination of regional transport from China and local formation at Seoul. We perform thermodynamic model simulations based on inorganic component measurements of haze particles collected at Seoul and Deokjeok Island (upwind background). Results suggest that in the downwind area (Seoul) the local formation of sulfates increases the mass concentrations of transported particles through the gas-particle partitioning of semivolatile nitric acid (HNO3) and ammonia (NH3). Therefore, this synergetic effect of the local sulfate formation on urban haze with regional transport must be considered in implementing effective particle reduction controls for urban sustainability. English IOP PUBLISHING LTD FINE-PARTICLE PH AIR-POLLUTION SECONDARY AMMONIA AEROSOLS ACIDITY SEOUL WATER Local formation of sulfates contributes to the urban haze with regional transport origin Article 10.1088/1748-9326/ab83aa 1 ENVIRONMENTAL RESEARCH LETTERS, v.15, no.8 ENVIRONMENTAL RESEARCH LETTERS 15 8 scie scopus 000563248600001 2-s2.0-85088412932 Environmental Sciences Meteorology & Atmospheric Sciences Environmental Sciences & Ecology Meteorology & Atmospheric Sciences Article FINE-PARTICLE PH AIR-POLLUTION SECONDARY AMMONIA AEROSOLS ACIDITY SEOUL WATER East Asian haze regional transport gas-particle partitioning of semivolatile inorganic species