الفهرس 
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Abstract
This study was directed towards the assesSIrent of some air pollutants and their constituents in the City of Alexandria during the period from May 1981 up to April 1982. This investigation includes a description of the topography of Alexandria, the population, the different activities, the main sources of air pollution and the meteorological data during this period. The sampling station was chosen to be the roof of the Occupational Research Building in SIrouha. Air-borne dust w~s collected by a high volume sampler. Samples were collected for 24 hours at air flow rates of 40 to 50 ft3/min. The concentration of particulates was determined and anal yzed for sane of its organic constituents such as fat, protein, carbohydrate and inorganic constituents such as sulfate and nitrate. The total dust concentration reached an average of 145 ~gm/m3 in . comparison to 193 ~gm/m3 in the previous five years study and 129 ~gm/m3 in the eastern sector of the city. Dust concentration was found to vary in the different months according to wind speed and direction where it was found to be inversely proportion to wind speed. The highest dust concent ration was found in May and June in contrast to April in the previous study and the lowest concentration was found in October in both our study and the previous study. The inorganic constituent of T.S.P. varied fran 58.7 - 146.5 ~gm/mJ representing almost 66 T.S.P. The highest percentage was found in Summer and the lowest in Winter. This was related to percentage of wind caning from the sea being higher in Summer and the lowest wind speed during this season. Average sulfate concentration was 14.6 ~gm/mJ which represented 10 of T.S.P. During the years 1978 - 1979 sulfate concentration was 16 ~gm/mJ for the city with 11of T.S.P. Highest concentrations were found to be in September, while the lowest was in January thus assuring the same findings of-the previous five years study. Sulfate source was found to be mainly caning fran the SW industrial sector and from the sea. With respect to nitrate, it was found to be 1.8 ~gm/mJ representing 1.2 of T.S.P. As for the organic constituent, it was found to vary fran 34.8 69.8 ~gm/mJ representing 34 of T.S.P. Highest concentration occurred during Winter and Fall seasons due to higher percentage of wind direction caning fran industrial sector and the higher fuel consumption during these ?easons. Protein, fat and carbohydrate concentrations reached an average of 4. 1, 7. 1, and O. 2 ~gm/mJ and their percentages in organic fraction were 2.8, 4.9 and 0.14 respectively. It was noticed that the highest concentrations of fat was in Spring followed by Summer and originated primarily fran industrial activities (E and SE) and secondly fran traffic activities. As for protein, highest concentrations were during Fall, follCMed by Summer, Spring and Winter (10.2, 9.0, 8.5 and 5.6