2010
DOI: 10.1016/j.atmosres.2009.09.007
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Influence of weekdays, weekends and bandhas on surface ozone in Kathmandu valley

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Cited by 22 publications
(24 citation statements)
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“…There should be a difference between weekday and weekend VOCs, and the change of VOC / NO x mixing ratios should also change according to the variation in their sources in this fast developing area, as in other regions of the world (Atkinson-Palombo et al, 2006;Sadanaga et al, 2008;Shao et al, 2009;Pudasainee et al, 2010). However, direct VOC measurements were not used in our analysis.…”
Section: Decrease In No X and Co On The Weekendmentioning
confidence: 99%
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“…There should be a difference between weekday and weekend VOCs, and the change of VOC / NO x mixing ratios should also change according to the variation in their sources in this fast developing area, as in other regions of the world (Atkinson-Palombo et al, 2006;Sadanaga et al, 2008;Shao et al, 2009;Pudasainee et al, 2010). However, direct VOC measurements were not used in our analysis.…”
Section: Decrease In No X and Co On The Weekendmentioning
confidence: 99%
“…The ozone level ranged from 22.65 ppb (QA) to 35.65 ppb (LF), whereas NO x remained at a high concentration. The (Stephens et al, 2008), France (Pont et al, 2001), Japan (Sadanaga et al, 2008), Nepal (Pudasainee et al, 2010) and Shanghai (Tang et al, 2009), which all had maximum ozone levels on Sunday. The detailed interpretations will be discussed in the next section.…”
Section: The Weekly Cycle Of Surface Ozone Concentrationmentioning
confidence: 99%
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“…As the day progresses, sunlight intensity becomes higher, increasing the radical concentration and hence the NO to NO 2 oxidation rate from the reaction of NO with peroxy radicals. Subsequent photolysis of NO 2 leads to increased O 3 throughout the day (Pudasainee et al, 2010), with the rate of O 3 production being a function of NO x and VOC levels as well as sunlight intensity. Recent studies of annually averaged daily VOC mixing ratios in London from the 191 m high BT (British Telecom) Tower have shown that benzene and toluene mixing ratios typically display two daytime maxima: one occurring around 09:00 and a second, larger peak occurring between 18:00 and 21:00 local time and coinciding with morning and evening peak traffic periods (Langford et al, 2010;Lee et al, 2015).…”
Section: Interpretation Of Temporal Trace Gas Profilesmentioning
confidence: 99%
“…The weekly pattern of air pollutants is of general interest, and studies have been carried out in North America (Blanchard and Tanenbaum, 2003;Pun et al, 2003;Murphy et al, 2007;Koo et al, 2012), Europe (Brönnimann and Neu, 1997;Pont and Fontan, 2001;Jenkin et al, 2002 Paschalidou andKassomenos, 2004), Mexico (Stephens et al, 2008), Japan (Sadanaga et al, 2012), India (Debaje and Kakade, 2006;Pudasainee et al, 2010;Srimuruganandam and Nagendra, 2011) and Egypt (Khoder et al, 2009). Some of these studies analysed the influence of meteorological parameters, such as temperature and radiation, on the occurrence of the weekend effect (Brönnimann and Neu, 1997).…”
Section: Introductionmentioning
confidence: 99%