Relationship between rooftop and on-road concentrations of trafficrelated pollutants in a busy street canyon: Ambient wind effects

Kyung Hwan Kwak, Sang Hyun Lee, Jaemyeong Mango Seo, Seung Bu Park, Jong Jin Baik

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

Rooftop and on-road measurements of O3, NO2, NOx, and CO concentrations were conducted to investigate the relationship between rooftop and on-road concentrations in a busy and shallow street canyon with an aspect ratio of ∼0.3 in Seoul, Republic of Korea, from 15 April to 1 May 2014. The median road-toroof concentration ratios, correlation coefficients between rooftop and on-road concentrations, and temporal variations of rooftop and on-road concentrations are analyzed according to the rooftop wind directions which are two cross-canyon and two along-canyon directions. The analysis results indicate that the relationship is strong when the rooftop is situated on the downwind side rather than on the upwind side. Relative to the cross-canyon wind directions, one of the along-canyon wind directions can more enhance the relationship. A conceptual framework is proposed to explain the effect of ambient wind direction on the relationship between rooftop and on-road concentrations in a street canyon.

Original languageEnglish
Pages (from-to)185-197
Number of pages13
JournalEnvironmental Pollution
Volume208
DOIs
StatePublished - 1 Jan 2016

Keywords

  • Ambient wind direction
  • Busy street canyon
  • On-road measurement
  • Rooftop measurement
  • Traffic-related pollutants

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