Journal of Korean Society for Atmospheric Environment (한국대기환경학회지)

Korean Society for Atmospheric Environment (한국대기환경학회)
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The Long-term Variations of Ozone and Nitrogen Oxides in Suwon City during 1991 ~2012

수원시 대기 중 오존과 질소산화물의 장기변동 특성 (1991 ~ 2012)

  • An, Hyunjin (Department of Earth and Environmental Sciences, Korea University) ;
  • Han, Jihyun (Department of Earth and Environmental Sciences, Korea University) ;
  • Lee, Meehye (Department of Earth and Environmental Sciences, Korea University) ;
  • Kang, Eunha (Urban and Environmental Research Group, Suwon Research Institute)
  • 안현진 (고려대학교 지구환경과학과) ;
  • 한지현 (고려대학교 지구환경과학과) ;
  • 이미혜 (고려대학교 지구환경과학과) ;
  • 강은하 (수원시정연구원 도시환경연구부)
  • Received : 2015.05.06
  • Accepted : 2015.08.10
  • Published : 2015.08.31
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Abstract

The long-term variations of ozone and nitrogen oxides in Suwon city, the capital of Gyeong-gi province, were examined from 1991 to 2012. In this period, the annual average $O_3$ concentration increased from 13.8 ppbv to 22.7 ppbv and that of $99^{th}$ percentile increased from 58.0 ppbv to 80.0 ppbv. The monthly average and $99^{th}$ percentile of $O_3$ concentrations were the highest in June. The increase in $O_3$ concentration was the greatest in early summer (May and June) before monsoon season began. While the concentrations of NO and NOx have gradually decreased since 2000, $NO_2$ remained unchanged. As a result, $NO_2/NO_x$ ratio increased from 0.5 to 0.73 in 2012. The monthly $NO_2/NO_x$ ratio was the highest in early summer, when monthly average $O_3$ concentration was the highest. It suggests that the enhanced $NO_2/NO_x$ ratio is intimately coupled with increase in $O_3$ for the last two decades in Suwon.

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References

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