Comparison between weekend and weekday ozone concentration in large cities in France

Pont, Véronique; Fontan, J.

doi:10.1016/s1352-2310(00)00308-3

Cited by 78 publications

(37 citation statements)

References 11 publications

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“…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%

Ozone weekend effects in the Beijing–Tianjin–Hebei metropolitan area, China

Wang

et al. 2014

Atmos. Chem. Phys.

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Abstract. The ozone weekend effect (OWE) was first investigated in the metropolitan area of Beijing-Tianjin-Hebei (BTH), China, using in situ measurements from the Atmospheric Environment Monitoring Network from July 2009 to August 2011. The results indicate that there is an obvious weekly periodical variation in the surface ozone concentration. There is a lower ozone concentration from Wednesday to Friday (weekday) and a higher concentration from Saturday to Monday (weekend) at all the locations of the study. NO x also displays a weekly cycle, with the maximum level occurring on weekdays and the minimum level on weekends, especially later on Sunday night and early Monday morning. This pattern may be responsible for the higher concentration of ozone on weekends. Additionally, the vertical variations in O 3 and NO x from the 8 m, 47 m, 120 m and 280 m observation platforms on the 325 m Beijing meteorological tower displayed obvious weekly cycles that corresponded to the surface results.A smaller decrease in volatile organic compounds (VOCs; using CO as a proxy) and much lower NO x concentrations on the weekend may lead to higher VOC / NO x ratio, which can enhance the ozone production efficiency in VOC-limited regime areas. Additionally, a clear weekly cycle in the fine aerosol concentration was observed, with maximum values occurring on weekdays and minimum values occurring on weekends. Higher concentrations of aerosol on weekdays can reduce the UV radiation flux by scattering or absorbing, which leads to a decrease in the ozone production efficiency. A significant weekly cycle in UV radiation, consistent with the aerosol concentration, was discovered at the Beijing meteorological tower site (BJT), validating the assumption. A comprehensive understanding of the ozone weekend effect in the BTH area can provide deep insights into controlling photochemical pollution.

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Section: The Weekly Cycle Of Surface Ozone Concentrationmentioning

confidence: 99%

Ozone weekend effects in the Beijing–Tianjin–Hebei metropolitan area, China

Wang

et al. 2014

Atmos. Chem. Phys.

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“…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%

Weekend-Weekday Effect Assessment for O3, NOx, CO and PM10 in Andalusia, Spain (2003-2008)

Adame

Hernández-Ceballos

Sorribas

et al. 2014

Aerosol Air Qual. Res.

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Day-of-week variations in O 3 , NO x , CO and PM 10 were analysed in the southwestern region of Europe (specifically Andalusia, Spain) using hourly concentrations collected at 43 stations (representing five typologies) over 6 years (2003)(2004)(2005)(2006)(2007)(2008). This area has air pollution problems, and the study of the weekend effect is used as a tool to plan future strategies for emissions reductions. Maximum daily 8 h averages for O 3 , daily 90 th percentiles for NO, NO 2 and PM 10 and mean daily values for CO were calculated and used to assess the weekend effect by applying three different metrics: weekly evolution, weekend-weekday differences and average daily difference between weekends minus workdays. Based on daily parameters and weekend-weekday differences, all the measured air pollutants exhibited clearly reduced concentrations (oscillating between 25 to 85%) on weekends, mainly at urban and suburban stations, with the exception of O 3 (less than 10 µg/m 3 ). This decrease on weekend days was mostly observed for NO, NO 2 and PM 10 at urban stations, while differences at industrial and rural stations were low or null. CO showed a low reduction. Using the daily cycle of differences (weekend minus workdays) as a reference, positive deviations were observed at night and negative differences were observed during the daytime for NO, NO 2 and PM 10 at urban traffic, urban background and suburban background sites. A reduction in morning rush hour traffic during the weekends was reflected in the data from urban stations, which showed a decrease of up to 50, 15 and 12 µg/m 3 for NO, NO 2 and PM 10 , respectively. An opposite daily behaviour was found for ozone, which showed an increase at urban area sites of up to 15 µg/m 3 in the early morning.

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“…Many analyses have shown that in urban areas in North America and Europe, concentrations of ozone, a principal component of photochemical smog, maximize on the weekend, when emissions of its anthropogenic precursors, nitrogen oxides (NO x ≡NO+NO 2 ) and volatile organic compounds (VOC), are lowest (Jacobson, 1975;Elkus and Wilson, 1977;Karl, 1978;Pryor and Steyn, 1995;Vukovich, 2000;Pont and Fontan, 2001;Pun et al, 2003). In contrast, at other sites, mainly those in rural areas or regions with high biogenic VOC emissions, ozone is at a minimum on the weekend (Cleveland and McRae, 1978;Altshuler et al, 1995;Husar, 1998;Heuss et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

The weekend effect within and downwind of Sacramento – Part 1: Observations of ozone, nitrogen oxides, and VOC reactivity

et al. 2007

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Abstract. Day-of-week patterns in human activities can be used to examine the ways in which differences in primary emissions result in changes in the rates of photochemical reactions, and the production of secondary pollutants. Data from twelve California Air Resources Board monitoring sites in Sacramento, CA, and the downwind Mountain Counties air basin are analyzed to reveal day of week patterns in ozone and its precursors in the summers of 1998-2002. Measurements of non-methane hydrocarbons are available for the summers of 2001-2003 at three of these sites and NO x at six of these sites for the full time period. This routine monitoring data is complemented by data sets of ozone and nitrogen oxide concentrations obtained in the summers of 2001 and 2003 at three sites in the region and comprehensive measurements of VOC reactivity at two sites in 2001. Daytime concentrations of nitrogen oxides (NO x ≡NO+NO 2 ) are approximately 35% lower on weekends at all the sites, whereas the VOC reactivity changes by less than 10%. All six sites in the Sacramento Valley have higher 8-h maximum average ozone on the weekend and are more likely to exceed the national standard of 85 ppb on the weekend. In contrast, all the sites in the Mountain Counties are less likely to exceed the federal ozone standard on the weekend. Analysis of the day-of-week trends in odd oxygen show that the weekend effect of ozone within Sacramento is strongly influenced by NO sources close to the monitoring sites. This suggests that ozone measurements from monitoring sites close to highways, including two rural locations, may not be representative of the regional abundance, and lead to underestimates of long term exposure for humans and ecosystems.

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Comparison between weekend and weekday ozone concentration in large cities in France

Cited by 78 publications

References 11 publications

Ozone weekend effects in the Beijing–Tianjin–Hebei metropolitan area, China

Ozone weekend effects in the Beijing–Tianjin–Hebei metropolitan area, China

Weekend-Weekday Effect Assessment for O3, NOx, CO and PM10 in Andalusia, Spain (2003-2008)

The weekend effect within and downwind of Sacramento – Part 1: Observations of ozone, nitrogen oxides, and VOC reactivity

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