The relative influence of the anthropogenic air pollutants on the atmospheric turbidity factors measured at an urban monitoring station

Elminir, Hamdy K.; Hamid, Ramiz; El-Hussainy, F. M.; Ghitas, Ahmed; Beheary, M. M.; Abdel-Moneim, Khaled M.

doi:10.1016/j.scitotenv.2006.02.025

Cited by 13 publications

(9 citation statements)

References 34 publications

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“…In the summer, increased turbidity is caused mainly by increased water vapor concentration in the atmosphere. Increased turbidity due to atmospheric water vapor and aerosols is also connected to air circulation, which is important for transporting air masses and the temporal variation of turbidity (Elminir et al, 2006, de Freitas et al, 2005. In the cold season (autumn and winter), days with low rainfall, the atmosphere is frequently lighter with lower concentrations of water vapor and aerosols in the local atmosphere.…”

Section: Analysis Of Monthly Average Linke's Turbiditymentioning

confidence: 99%

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Temporal variability of atmospheric turbidity and DNI attenuation in the sugarcane region, Botucatu/São Paulo/Brazil

Santos

Escobedo

2016

Atmospheric Research

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In this study, attenuation of direct normal solar irradiance (DNI) in Botucatu / São Paulo, an area under the influence of local and adjacent agricultural burning, is expressed using the Linke's turbidity factor (TL) in the period from 1996 to 2008. Two methodologies represented as TL Dj and TL Li were used. Temporal variability (hourly average for the season and monthly average) is presented. Turbidity was correlated with wind speed and air temperature. Frequency distribution and cumulative frequency are analyzed to determine turbidity predominance levels in the local atmosphere. Optical depth information of aerosols at 550 nm (AOD 550nm) and water vapor were obtained by the Terra satellite using the MODIS sensor. The highest degree of DNI transmission is observed in the morning. Close to solar noon, transmission is smaller (greatest TL value). Diurnal TL variability is more evident in the hot period than in the cold period. May and June were the months of lowest DNI attenuation (highest atmospheric transparency). The highest DNI attenuation occurs in spring (TL Dj = 4.22 ± 0.05 and TL Li = 4.65 ± 0.06) and summer (TL Dj = 4.27 ± 0.14 and TL Li = 4.69 ± 0.15). Wind speed and air temperature were positively correlated with TL. In N 28% of hours of clear sky, turbidity exceeded the value of 4.0. The region of Botucatu seems to be influenced by water vapor and aerosols from different origins. This study concludes that these factors significantly reduce DNI incidence on the surface, with higher atmospheric transparency in the cold period and lower atmospheric transparency in the warm period.

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Section: Analysis Of Monthly Average Linke's Turbiditymentioning

confidence: 99%

“…Atmospheric turbidity can correlate positively or negatively with wind. In Cairo, Egypt, for example, atmospheric turbidity decreases with increasing wind speed, Elminir et al (2006), which can be explained by the air flux caused by buildings. Fig.…”

Section: Relationship Between Linke's Turbidity and Meteorological Pamentioning

confidence: 99%

Temporal variability of atmospheric turbidity and DNI attenuation in the sugarcane region, Botucatu/São Paulo/Brazil

Santos

Escobedo

2016

Atmospheric Research

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“…The intensification of human activity (industry, transport, waste burning, etc.) associated with this population growth is one of the main reasons for the severe pollution of the city's air . The most important sources of air pollution in Greater Cairo are trash burning, vehicle emissions (there are ~4.5 million cars on the streets of Cairo) and large scale urban industrial operations.…”

Section: Introductionmentioning

confidence: 99%

On the elemental composition of PM_2.5 in central Cairo, Egypt

et al. 2013

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Aerosol particles are among the criteria pollutants identified by many countries because of their effects on human health and the environment. Information about the elemental composition of the aerosol particles is useful for source apportionment and determining the possible negative effects of the particulate air pollution. In this study, fine aerosol particles (PM 2.5 ) were collected over 24 h once a week at roof level at the National Research Center in the center of Cairo, Egypt, between September 2010 and May 2011 using a cyclonic sampler. The site is representative of urban residential areas in the center of this megacity. Elemental determination was performed using an energy dispersive X-ray fluorescence spectrometer with a Mo secondary target, and the measured concentrations were evaluated using the quantitative X-ray analysis system/AXIL software package. The concentrations of 16 elements were determined in the collected aerosol samples, although some were generally not present at levels above the method's limit of detection. The concentrations of many of the elements exceeded those in other urban environments. The concentration of Pb was 95 AE 200 ng/m 3 , well below the Egyptian legal limit of 500 ng/m 3 . This represents a significant decrease since 1997, when concentrations above 3 mg/m 3 were measured. The decrease is due to the banning of Pb in vehicle fuel in 1997 and the movement of Pb smelters from the central part of Cairo in 2002. Analysis of the elemental concentrations revealed seasonal variation in their levels and possible sources of the emissions, and enabled us to estimate their effects on human health.

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“…So, this work focuses on the study of suspended particulate matters (PM 10 ) at Qena. Many sources offer good descriptions of Advances in Meteorology 3 PM 10 concentrations in Egypt such as Sivertsen and El Seoud [24], Elminir et al [25], Elminir [26], and Zakey et al [21]. However, Sivertsen and El Seoud [24] reported that the annual average concentrations of PM 10 range between 100 g m −3 and 200 g m −3 in urban and residential areas and between 200 g m −3 and 500 g m −3 near industrial areas.…”

Section: Introductionmentioning

confidence: 99%

Suspended Particulates Concentration (PM₁₀) under Unstable Atmospheric Conditions over Subtropical Urban Area (Qena, Egypt)

Adam

2013

Advances in Meteorology

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The main purpose of this study is to evaluate the suspended particulates (PM10) in the atmosphere under unstable atmospheric conditions. The variation of PM10was investigated and primary statistics were employed. The results show that, the PM10concentrations values ranged from 6.00 to 646.74 μg m−3. The average value of PM10is equal to 114.32 μg m−3. The high values were recorded in April and May (155.17 μg m−3and 171.82 μg m−3, respectively) and the low values were noted in February and December (73.86 μg m−3and 74.05 μg m−3, respectively). The average value of PM10of the hot season (125.35 × 10−6 g m−3) was higher than its value for the cold season (89.27 μg m−3). In addition, the effect of weather elements (air temperature, humidity and wind) on the concentration of PM10was determined. The multiple R between PM10and these elements ranged from 0.05 to 0.47 and its value increased to reach 0.73 for the monthly average of the database used. Finally, the PM10concentrations were grouped depending on their associated atmospheric stability class. These average values were equal to 122.80 ± 9 μg m−3(highly unstable or convective), 109.37 ± 12 μg m−3(moderately unstable) and 104.42 ± 15 μg m−3(slightly unstable).

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The relative influence of the anthropogenic air pollutants on the atmospheric turbidity factors measured at an urban monitoring station

Cited by 13 publications

References 34 publications

Temporal variability of atmospheric turbidity and DNI attenuation in the sugarcane region, Botucatu/São Paulo/Brazil

Temporal variability of atmospheric turbidity and DNI attenuation in the sugarcane region, Botucatu/São Paulo/Brazil

On the elemental composition of PM_2.5 in central Cairo, Egypt

Suspended Particulates Concentration (PM₁₀) under Unstable Atmospheric Conditions over Subtropical Urban Area (Qena, Egypt)

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The relative influence of the anthropogenic air pollutants on the atmospheric turbidity factors measured at an urban monitoring station

Cited by 13 publications

References 34 publications

Temporal variability of atmospheric turbidity and DNI attenuation in the sugarcane region, Botucatu/São Paulo/Brazil

Temporal variability of atmospheric turbidity and DNI attenuation in the sugarcane region, Botucatu/São Paulo/Brazil

On the elemental composition of PM2.5 in central Cairo, Egypt

Suspended Particulates Concentration (PM10) under Unstable Atmospheric Conditions over Subtropical Urban Area (Qena, Egypt)

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Product

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On the elemental composition of PM_2.5 in central Cairo, Egypt

Suspended Particulates Concentration (PM₁₀) under Unstable Atmospheric Conditions over Subtropical Urban Area (Qena, Egypt)