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Document Type |
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Thesis |
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Document Title |
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Effect of Remote and Local Sources on PM10 Concentrations in Two Locations in Jeddah. تأثير المصادر البعيدة والمحلية على تركيزات الجسيمات الدقيقة الأقل من 10 ميكرون في موقعين بمدينة جدة. |
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Subject |
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Department of Environmental Sciences |
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Document Language |
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Arabic |
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Abstract |
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Jeddah urban area has exposed to high concentrations of PM10 (particulate matter with diameter less than 10 µm) originating from remote and local sources including natural and anthropogenic sources.
In this thesis, hourly data of PM10 and other gaseous pollutants ( NOx, CO , SO2 and O3 ) and meteorological factors (temperature, relative humidity, atmospheric pressure, wind speed and wind direction) were collected at two air quality monitoring sites in Jeddah urban area for the period of March 2008 to February 2009.
This study has two aims, 1) To investigate the long range transport of PM10 as specific urban air quality problem causing PM10 episodes in the study area; 2) To study the relationship between PM10 level and other gaseous pollutants; and meteorological factors.
The PM10 Daily Limit Value (150 µg/m³) was exceeded in 38 days, 13 cases of episodic events were analyzed. The air mass origin was determined using 5-day backward trajectories arriving to Jeddah by using HYSPLIT model. It has been found that the most frequent air masses entering Jeddah and thereby influencing PM10 concentrations come from the East, specifically the SE and NE directions, 84% of the trajectories were originated over the Arabian Peninsula includes Saudi Arabia mainland and the Arabian Gulf. The Mediterranean Sea and southern Europe were the origin source of 8% of the air mass trajectories, another 8% were originated from North Africa and Sahara Desert. The majority of PM10 episodes were attributed to the intrusion of dust to Jeddah urban air.
The dataset were statistically analyzed to study the contribution of local sources to the PM10 pollution in the study area. The PM10 concentrations were found to be somewhat higher during weekdays than during weekends and correlated very strongly ( R²= 0.783) between the two monitoring sites, correlation is significant at the 0.01 level. Moderate positive correlation by means of Pearson Correlation between PM10 and (NOx, NO and SO2) (R= 0.353, R= 0.347 and R= 0. 201) respectively. Moderate negative correlation between PM10 and (O3, temperature and wind speed) ( R= - 0.276, R= - 0.231 and R= - 0.311 ) respectively. The linear regression of PM10 as dependant variable against NOx and NO as independent variables were generally weak (R²= 0.146 and R²= 0.128) suggesting that non-proximate effect of different sources may contribute to the total PM10 concentrations in the study area. |
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Supervisor |
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Dr. Hesham Abdullah Jeelani |
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Thesis Type |
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Master Thesis |
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Publishing Year |
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1434 AH
2013 AD |
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Added Date |
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Thursday, November 21, 2013 |
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Researchers
| محمد علوي بابيضان | Babidhan, Mohammed Alawi | Researcher | Master | |
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