Ground level ozone concentrations at a rural location in northern Spain

García, M. Ángeles; Sánchez, M. Luisa; Pérez, Isidro A.; Torre, B. de

doi:10.1016/j.scitotenv.2004.12.049

Cited by 49 publications

(26 citation statements)

References 37 publications

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“…Previous studies on the seasonal variations of O 3 concentration in other urban areas in Greater Cairo had observed that the highest levels of O 3 were in summer and the lowest levels were in winter (Rizk 1992;Khoder 1997Khoder , 2002Khoder and 2004 fact that O 3 in the summer season is associated with local photochemical production (Derwent and Davies 1994;Lin et al 2001;Wolff et al 2001;Kourtidis et al 2002). The level of O 3 increases with the increase in the temperature and solar radiation intensity (Olszyna et al 1997;Vingarzan and Taylor 2003;Vukovich and Sherwell 2003;Ribas and Peñuelas 2004;Garcia et al 2005). On the other hand, the more stable atmospheric conditions and the increased frequency of nocturnal inversions in Greater Cairo during the winter months (Khoder 1997 and2004) lead to an increase in the NOx concentration.…”

Section: Resultsmentioning

confidence: 94%

“…These radicals oxidize NO to NO 2 without consumption of O 3 and then the photolysis of the resulting NO 2 by sunlight leads to increase the accumulation of O 3 (Alvim-Ferraz et al 2006). High levels of O 3 might be registered within city or at a distance downwind due to the high emissions of O 3 precursors in urban areas (Garcia et al 2005). Ozone precursors may be transported over long distances under the effect of meteorological conditions, leading to O 3 formation far from the sources (Hastie et al 1999;Brankov et al 2003).…”

Section: Introductionmentioning

confidence: 99%

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Diurnal, seasonal and weekdays–weekends variations of ground level ozone concentrations in an urban area in greater Cairo

Khoder

2008

Environ Monit Assess

107

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Ground level ozone (O3) concentration was monitored during the period of December 2004 to November 2005 in an urban area in Greater Cairo (Haram, Giza). During the winter and summer seasons, nitrogen dioxide (NO2) and nitric oxide(NO) concentrations and meteorological parameters were also measured. The mean values of O3 were 43.89, 65.30, 91.30 and 58.10 ppb in daytime and 29.69, 47.80, 64.00 and 42.70 ppb in whole day (daily) during the winter, spring, summer and autumn seasons, respectively. The diurnal cycles of O3 concentrations during the four seasons revealed a uni-modal peak in the mid-day time, with highest O3 levels in summer due to the local photochemical production. The diurnal variations in NO and NO2 concentrations during the winter and summer showed two daily peaks linked to traffic density. The highest levels of NOx were found in winter. Nearly, 75%, 100%, 34.78% and 52.63% of the mean daytime concentrations of O3 during spring,summer, autumn and the whole year, respectively, exceeded the Egyptian and European Union air quality standards (60 ppb) for daytime (8-h) O3 concentration. About, 41.14% and 10.39% of the daytime hours concentrations and 14.93% and 3.77% of the daily hour concentrations in summer and the whole year, respectively, exceeded the Egyptian standard (100 ppb) for maximum hourly O3 concentration, and photochemical smog is formed in the study area (Haram) during a periods represented by the same percentages. This was based on the fact that photochemical smog usually occurs when O3 concentration exceeds 100 ppb. The concentrations of O3 precursors (NO and NO2) in weekends were lower than those found in weekdays, whereas the O3 levels during the weekends were high compared with weekdays. This finding phenomenon is known as the "weekend effect". Significant positive correlation coefficients were found between O3 and temperature in both seasons and between O3 and relative humidity in summer season, indicating that high temperature and high relative humidity besides the intense solar radiation (in summer) are responsible for the formation of high O3 concentrations.

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Section: Resultsmentioning

confidence: 94%

Section: Introductionmentioning

confidence: 99%

Diurnal, seasonal and weekdays–weekends variations of ground level ozone concentrations in an urban area in greater Cairo

Khoder

2008

Environ Monit Assess

107

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“…In previous studies, the horizontal transport of ozone polluted air masses were reported to occur over considerably greater ranges from 40-80 km (USEPA 1976) to 150-250 km (SCEC 1997). More recently, García et al (2005) demonstrated that ozone was transported from North Africa and sub-Saharan areas to the Iberian Peninsula. It can, therefore, be hypothesized that a part of Boukornine's ambient ozone could also partly result from continental (sub-Saharan origin) and/or intercontinental transport (Europe northerly flow) associated with sea-breeze circulation (Mihalopoulos 2007).…”

Section: Tobacco's Plant Leaf Damage In Relation To Altitudinal and Cmentioning

confidence: 99%

Ozone Level Assessment on the Boukornine National Park (Tunisia) using Plant Biomonitoring: Influence of Altitudinal Parameter and Meteorological Conditions

Mechergui

Mansoura

Laffray

et al. 2009

Water Air Soil Pollut

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The variations of tropospheric ozone levels was assessed for the first time in the Boukornine National Park (N.E. Tunisia) by detection of leaf injury development on Nicotiana tabacum "Bel-W3" exposed to environmental conditions during summer 2004. Two cultivars of tobacco (Nicotiana tabacum), Bel-W3 (sensitive) and Bel-B (resistant to ozone), were used for this biomonitoring study. These cultivars were dispersed in 24 different biostations, according to a square grid mesh, every 2 weeks. Four successive cultures were utilized to follow the ozone levels inside the park during the summer exposure period. Levels of ozone may vary in time and space depending on the local environmental and meteorological conditions. The results showed a positive correlation between ozone concentration and foliar injury index (FII; r=0.958; p<0.05). A significant positive correlation was observed between the FII of Bel-W3 tobacco plant and AOT40 (accumulated over the threshold of 40 ppb). The altitude appeared to be the most important variable explaining the variation of ozone pollution with the highest correlation coefficient (r=0.964; p<0.0001). The altitude was followed by topography for the prediction of ozone concentration levels. Maximal temperature was also an important factor in addition to the others in determining the FII and was negatively correlated with the FII (r=−0.979; p<0.05). Average ambient ozone levels were positively linked to plant leaf damage. The ozone profile characterizing the study area was primarily influenced by wind direction and speed in relation to intercontinental transport, in addition to the local influence of motor vehicles traffic flow in the Tunis region.

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“…Numerous studies, over the last decade, refer to the effects of air pollution on public health (Künzli et al, 2000;Katsouyanni et al, 2003;Bartzokas et al, 2004;Paliatsos et al, 2006;Nastos et al, 2008;Nastos, 2008;Bosson et al, 2009;Tonne et al, 2010;Kalantzi et al, 2011). Surface ozone concentrations in the eastern Mediterranean region have been analyzed previously (Ziomas et al, 1989;Álvarez et al, 2000;Kalabokas et al, 2000;Kalabokas et al,2004;García et al, 2005;Gerasopoulos et al, 2006;Paliatsos et al, 2008). Several studies have shown that the background ozone concentrations in the troposphere have more than doubled (Volz and Kley, 1988;Staehelin and Smith, 1991;Bonasoni et al, 2000).…”

Section: Introductionmentioning

confidence: 99%

Prognosis of maximum daily surface ozone concentration within the greater Athens urban area, Greece

2014

Global NEST: The International Journal

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In recent decades, there has been an increasing interest in the prognosis of maximum surface ozone concentrations due to the adverse effects on human health, animal population, agricultural productivity and forestry. The present study deals with the development and application of Artificial Neural Network (ANN) models in predicting the maximum daily surface ozone concentration in several locations within the greater Athens area (GAA), 24-hours in advance. Meteorological and air pollution data during the period 2001 to 2005 were provided by the network of the Hellenic Ministry of the Environment, Energy and Climate Change. Hourly values of barometric pressure and total solar irradiance for the same period have been recorded by the National Observatory of Athens. A training data set for the ANN prognostic model was generated by employing the superposed epoch analysis.The evaluation of the performance of the developed model, using appropriate statistical indices, clearly indicates that the risk of surface ozone values exceeding the European Union (EU) threshold for human health protection can be successfully predicted. This suggests that the proposed ANN model can be used to issue warnings for the general public and especially certain sensitive groups of the population.

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Ground level ozone concentrations at a rural location in northern Spain

Cited by 49 publications

References 37 publications

Diurnal, seasonal and weekdays–weekends variations of ground level ozone concentrations in an urban area in greater Cairo

Diurnal, seasonal and weekdays–weekends variations of ground level ozone concentrations in an urban area in greater Cairo

Ozone Level Assessment on the Boukornine National Park (Tunisia) using Plant Biomonitoring: Influence of Altitudinal Parameter and Meteorological Conditions

Prognosis of maximum daily surface ozone concentration within the greater Athens urban area, Greece

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