Peroxyacetyl nitrate (PAN) in the urban atmosphere

Jun Bok Lee, Joong Sup Yoon, Kweon Jung, Seok Won Eom, Young Zoo Chae, Seog Ju Cho, Shin Do Kim, Jong Ryeul Sohn, Ki Hyun Kim

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Abstract

Peroxyacetyl nitrate (PAN) in air has been well known as the indicator of photochemical smog due to its frequent occurrences in Seoul metropolitan area. This study was implemented to assess the distribution characteristics of atmospheric PAN in association with relevant parameters measured concurrently. During a full year period in 2011, PAN was continuously measured at hourly intervals at two monitoring sites, Gwang Jin (GJ) and Gang Seo (GS) in the megacity of Seoul, South Korea. The annual mean concentrations of PAN during the study period were 0.64±0.49 and 0.57±0.46ppb, respectively. The seasonal trends of PAN generally exhibited dual peaks in both early spring and fall, regardless of sites. Their diurnal trends were fairly comparable to each other. There was a slight time lag (e.g., 1h) in the peak occurrence pattern between O3 and PAN, as the latter trended to peak after the maximum UV irradiance period (16:00 (GJ) and 17:00 (GS)). The concentrations of PAN generally exhibited strong correlations with particulates. The results of this study suggest that PAN concentrations were affected sensitively by atmospheric stability, the wet deposition of NO2, wind direction, and other factors.

Original languageEnglish
Pages (from-to)1796-1803
Number of pages8
JournalChemosphere
Volume93
Issue number9
DOIs
Publication statusPublished - 2013 Nov 1

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Keywords

  • O
  • PAN
  • Photochemical smog
  • VOCs

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

Cite this

Lee, J. B., Yoon, J. S., Jung, K., Eom, S. W., Chae, Y. Z., Cho, S. J., Kim, S. D., Sohn, J. R., & Kim, K. H. (2013). Peroxyacetyl nitrate (PAN) in the urban atmosphere. Chemosphere, 93(9), 1796-1803. https://doi.org/10.1016/j.chemosphere.2013.06.019