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Influence of weekdays, weekends and bandhas on surface ozone in Kathmandu valley
Yonsei Univ, YIEST, Dept Environm Engn, Seoul 120749, South Korea.ORCID iD: 0000-0002-3565-9943
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2010 (English)In: Atmospheric research, ISSN 0169-8095, Vol. 95, no 2-3, 150-156 p.Article in journal (Refereed) Published
Abstract [en]

In this paper, variations of nitric oxide (NO), nitrogen dioxide (NO2), oxides of nitrogen (NOx), ozone (O-3) and total oxidant (O-X) concentration in ambient air of Kathmandu valley are presented. O-3 behavior during weekdays, weekends and bandhas (general strike) is analyzed and the mechanism related to it is discussed. The increased NO2/Ox ratio with increasing NOx concentration and the inverse relation between NOx and O-3 imply that the residual O-3 remaining after the NO-NO2-O-3 reaction chain controlled O-3 concentration in the valley atmosphere and the radical channel was likely to have a minor contribution. The higher positive correlation coefficient for O-3 variation during weekdays and bandhas, weekdays and weekends suggests common sources for the weekends and bandhas O-3 variation. The higher O-3 concentration during weekends and bandhas compared to weekdays was due to less destruction of O-3. Enhanced reduction in traffic emission levels, enforcement of stringent emission standards within the valley and the surroundings may help to address the O-3 problem in the valley atmosphere.

Place, publisher, year, edition, pages
2010. Vol. 95, no 2-3, 150-156 p.
National Category
Environmental Sciences
Research subject
Natural Science, Environmental Science
Identifiers
URN: urn:nbn:se:lnu:diva-21075DOI: 10.1016/j.atmosres.2009.09.007OAI: oai:DiVA.org:lnu-21075DiVA: diva2:543656
Available from: 2012-08-09 Created: 2012-08-09 Last updated: 2014-03-27Bibliographically approved

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Citation style
  • apa
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  • Other locale
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