Heejeong Kim1, Woo-Chul Choi1, Ho-Jun Rhee1, Inseon Suh1, Meehye Lee 1,8, Donald R. Blake2, Saewung Kim3, Jinsang Jung4, Gangwoong Lee5, Deug-Soo Kim6, Seung-Myung Park7, Junyoung Ahn7, Sang Deok Lee7

Department of Earth and Environmental Sciences, Korea University, Seoul 02841, Korea
Department of Chemistry, University of California, Irvine, CA 92617, USA
Department of Earth System Science, University of California, Irvine, CA 92697, USA
Center for Gas Analysis, Korea Research Institute of Standards and Science, Daejeon 34113, Korea
Department of Environmental Sciences, Hankuk University of Foreign Studies, Yongin 449-791, Korea
Department of Environmental Engineering, Kunsan National University, Kunsan 573-701, Korea
Department of Climate and Air Quality, National Institute of Environmental Research, Incheon 22689, Korea
Green School, Korea University, Seoul 02841, Korea

Received: November 25, 2017
Revised: July 9, 2018
Accepted: July 10, 2018
Download Citation: ||https://doi.org/10.4209/aaqr.2017.11.0445  

  • Download: PDF

Cite this article:
Kim, H., Choi, W.C., Rhee, H.J., Suh, I., Lee, M., Blake, D.R., Kim, S., Jung, J., Lee, G., Kim, D.S., Park, S.M., Ahn, J. and Lee, S.D. (2018). Meteorological and Chemical Factors Controlling Ozone Formation in Seoul during MAPS-Seoul 2015. Aerosol Air Qual. Res. 18: 2274-2286. https://doi.org/10.4209/aaqr.2017.11.0445


  • Meteorological condition was a key factor determining the level of NOx and VOCs.
  • O3 was higher under lower NOx and higher temperature in aged and stagnant air mass.
  • The contribution of BVOCs to O3 formation was enhanced under stagnant condition.
  • The formation of O3 was more sensitive to VOCs than NOx during MAPS-Seoul 2015.


To understand the chemical mechanisms of controlling factors in ozone (O3) formation in early summer in Seoul, a comprehensive study encompassing measurement and modeling was conducted under the Megacity Air Pollution Study-Seoul (MAPS-Seoul) campaign. From May 18 to June 12, 2015, O3 and peroxyacetyl nitrate (PAN) were measured, along with their precursors, including NOx and volatile organic compounds (VOCs), at the Korea Institute of Science and Technology, located in northeast Seoul. VOCs were sampled in a canister twice a day (at 09:30 and 15:00) and analyzed via gas chromatography. The meteorological conditions and chemical regimes of the air masses were clearly distinguished during the study period. In May, NOx concentrations were higher with more pronounced diurnal cycles of precursors and O3 under constant westerly winds. By contrast, stagnant conditions developed in June, which reduced the inflow of primary emissions from the downtown area but increased the influence from the neighboring forest under high temperatures. As a result, the ratio of O3 to odd oxygen was higher in June, indicating a less efficient removal of O3 by NOx. In the same context, the air mass was chemically more aged with a higher NO2/NOx ratio and enhanced OH reactivity of oxygenated and biogenic VOCs in June. The overall measurement results suggest that O3 formation is slightly more sensitive to VOCs than to NOx in Seoul during this season, when O3 concentrations are the highest of the year.

Keywords: O3 formation; NOx; VOCs; Meteorological condition; MAPS-Seoul


Share this article with your colleagues 


Subscribe to our Newsletter 

Aerosol and Air Quality Research has published over 2,000 peer-reviewed articles. Enter your email address to receive latest updates and research articles to your inbox every second week.

79st percentile
Powered by
   SCImago Journal & Country Rank

2023 Impact Factor: 2.5
5-Year Impact Factor: 2.8

Aerosol and Air Quality Research partners with Publons

CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit
CLOCKSS system has permission to ingest, preserve, and serve this Archival Unit

Aerosol and Air Quality Research (AAQR) is an independently-run non-profit journal that promotes submissions of high-quality research and strives to be one of the leading aerosol and air quality open-access journals in the world. We use cookies on this website to personalize content to improve your user experience and analyze our traffic. By using this site you agree to its use of cookies.