Ozone weekend effect in Santiago, Chile

Seguel, Rodrigo; Morales, Gladys; Leiva, A G Manuel

doi:10.1016/j.envpol.2011.10.019

Cited by 70 publications

(42 citation statements)

References 25 publications

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“…The percentages of variation of the O 3 8-h mean concentrations in Cen (11.7-18.4%) and Bel (19.7-31.1%) are consistent with the percentages (18.9-30.1%) reported by Seguel et al [15], in the study of the WE in Santiago, Chile. These stations are located in consolidated urban zones, where on-road traffic is the most relevant source of pollutants.…”

Section: Conclusion and Discussionsupporting

confidence: 80%

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Identifying the Ozone Weekend Effect in the air quality of the northern Andean region of Ecuador

Parra¹,

Franco²

2016

WIT Transactions on Ecology and the Environment

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The Weekend Effect (WE) is a phenomenon that occurs in some urban areas, characterized by increased concentrations of O 3 and decreased emissions of its precursors (NO x and VOC) during weekend days, in comparison to weekdays. The study of the WE is relevant for understanding the behavior of pollutants; and hence, for air quality control. We analyzed the hourly records of the period 2005-2012, from 8 stations of the air quality network from the Distrito Metropolitano de Quito (northern Andean region of Ecuador). Both for each station and year, 3 mean-daily profiles were obtained for CO, NO 2 , PM 2.5 and O 3 , corresponding to weekdays, Saturdays and Sundays. The CO, NO 2 and PM 2.5 profiles from Centro (historic center of Quito) and Belisario (center-north) stations, declined on Sundays. However the O 3 profiles were higher on Saturdays and Sundays. The O 3 8-h mean concentrations of Sundays were higher in Belisario (19.7-31.1%) and Centro (11.7-18.4%), in comparison to weekdays. These results indicate the presence of the WE around these 2 stations, which probably are located in a VOClimited region for photochemical O 3 production.

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Section: Conclusion and Discussionsupporting

confidence: 80%

“…O 3 8-h concentrations were obtained as the mean of the hourly concentrations between 09h00 to 16h00, considering that during this period typically the O 3 concentrations are higher. This approach is the same that Seguel et al [15] followed in the study of the WE in Santiago, Chile. …”

Section: Methodsmentioning

confidence: 98%

Identifying the Ozone Weekend Effect in the air quality of the northern Andean region of Ecuador

Parra¹,

Franco²

2016

WIT Transactions on Ecology and the Environment

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“…In particular, it has been observed that biogenic contribution to VOCs in Santiago is maximal at the hours of highest temperatures. 24 Furthermore, it must be noted the possible feedback between temperature and ozone levels. In fact, increased temperature can increase the ozone levels, increasing so the green-house effect and further increasing the temperature.…”

Section: Resultsmentioning

confidence: 99%

“…With respect to ozone levels during weekends in Santiago, there seems to be two conflicting sets of results. By one side, Jorquera et al 6 and Seguel et al 24 sustain that ozone concentrations are higher during weekends despite lower concentrations of ozone precursors, a phenomenon known as "weekend effect". On the other hand, Rubio et al 28,29 has proposed that this effect is moderated and produces similar concentrations in weekends and weekdays.…”

Section: Ozone Levels In Weekendmentioning

confidence: 99%

Temperature as Thumb Rule Predictor of Ozone Levels in Santiago De Chile Ground Air

Rubio

Eduardo

2014

J. Chil. Chem. Soc.

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Ozone concentrations in the urban air of Santiago de Chile frequently surpass the air quality standard in summertime, particularly in the eastern part of the city (Las Condes). The main parameter that determines ozone episodes is the ground level daily maximum temperature. In the present work we propose that this single parameter can be employed as a simple predictor of the expected ozone levels. In particular, it is found that high ozone episodes takes place in Las Condes when the maximum daily temperature is higher than 30 ºC. This single criterion applies during all the summer period (from December to March) and for weekdays and weekends. On the other hand, ozone episodes in downtown take place only when the maximum daily temperature reaches values higher than 32.5 ºC. These simple relationships imply that weather forecast could be employed by the citizens to estimate the risk associated to carry out outdoors activities.

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“…Further studies on the role of VOC species and on atmospheric transport and dispersion dynamics, by means of more detailed measurements and photochemical models, are necessary [7]. The WE phenomenon has been observed in many other polluted urban atmospheres, where changes in VOC/NO x ratios that occur on weekends lead to higher ozone concentrations on weekends [21][22][23][24].…”

Section: Discussion Of Resultsmentioning

confidence: 99%