A Study on the Seasonal Correlation between O3 and PM2.5 in Seoul in 2017

Ha Kyung Lee, Eun Lak Choi, Hyun Ji Lee, Su Young Lee, Ji Yi Lee

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8 Scopus citations


Abstract To characterize the correlation between tropospheric O3 and PM2.5 by season, a comprehensive analysis for the interaction between tropospheric O3 and PM2.5 has been performed over 25 sites in Seoul in 2017. Highly positive correlation between O3 and PM2.5 was observed during the summer period (June, July, and August) and this is related to the simultaneous formation of O3 and PM2.5 due to an increase of the atmospheric oxidation ability. While, correlations of O3 and PM2.5 were negative in the winter period (January, February, and December), showing the opposite trend with summer. The negative correlation for O3 and PM2.5 in winter might be due to both aerosol-radiation interactions and the O3 titration effect by NOx. We also found that NOx plays a more significant role to decrease O3 concentration than PM2.5 on a low concentration of O3 in winter. It indicates that there are seasonal difference for the mechanisms of O3 and PM2.5 interaction. Therefore, it is required on a diferent O3 and PM2.5 reduction approach for each season.

Original languageEnglish
Pages (from-to)533-542
Number of pages10
JournalJournal of Korean Society for Atmospheric Environment
Issue number4
StatePublished - 2020

Bibliographical note

Publisher Copyright:
© 2020


  • Aerosol radiation interactions
  • Air pollution of Seoul
  • NO titration effect
  • O
  • PM


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