Seasonal Characteristics of HONO Variations in Seoul during 2021~2022

Junsu Gil, Meehye Lee, Hyunmin Lee, Jihi Jang

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)


HONO takes up a large amount of urban OH budget in the early morning through photolysis and is one of the major reactive nitrogen oxides (NOy) that finally contributes to the enhancement of daytime O3 and potentially PM2.5 nitrate (NO3-). Therefore, it is important to figure out the distribution and characteristics of HONO to understand the formation mechanisms of O3 and NO3- in urban areas. In this study, real-time HONO measurement was conducted in Seoul, South Korea from 2021 to 2022 using the MARGA (Monitor for AeRosol and Gases in Ambient air) system. During the whole measurement period, average concentration of HONO was 0.96 ppbv, and it was higher in the cold season when the NO2 concentration was high. Regardless of the season, HONO increased with an increase in NO2 and relative humidity, indicating that the HONO in Seoul was influenced by the heterogeneous formation. In addition, the impact of HONO on O3 was differed on the season, and HONO showed the possibility to contribute to the NO3- during both daytime and nighttime via formation-loss process.

Translated title of the contribution2021~2022년 서울 도심에서 측정된 HONO의 변화 특성
Original languageEnglish
Pages (from-to)308-319
Number of pages12
JournalJournal of Korean Society for Atmospheric Environment
Issue number3
Publication statusPublished - 2023

Bibliographical note

Publisher Copyright:
© 2023, Journal of Korean Society for Atmospheric Environment. All Rights Reserved.


  • Heterogeneous reaction
  • Nitrous acid (HONO)
  • O
  • PM nitrate (NO)

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Chemistry
  • Environmental Science (miscellaneous)
  • Pollution


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