الفهرس 
Introduction
Monitoring of total suspended matter (TSP) in the airOnly 14 pages are availabe for public view
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Abstract
The following study was carried out to evaluate the direct effect of air pollutants on citrus trees grown at the orchard of Agricultural Research Station of Mansoura University adjacent to the New bridge of EL-Mansoura city which located at the westnorthern side of the orchard, in comparison to another citrus orchard, far from the pollution of main roads. This study was carried out during the two successive seasons of 2004 /2005 and 2005/ 2006 of citrus trees; Valencia orange (Citrus sinensis ( L.) Osbeck) and Balady mandarin (Citrus reticulata, Blanco). This study revealed the following results :- 1-Results revealed that Ozone,O3 in ambient air, also sulfur dioxide SO2 and nitrogen dioxide NO2 concentrations ranged from 290-400, 342-799 and 492- 689 µg / m³ during the period of monitoring in Sep. 2004 and 2005, respectively at the site of EL-Gamaa. Comparison to the reference site at Sanboghat . 2-Monitoring of heavy metals Pb and Cd in the air showed an increase of Pb and Cd in the dust collected in the filter of Pb ranged at the first site between 1.76 to 3.48 µg / m³ air, while 0.15 to 0.359 µg / m³ in the air of the second one. 3-Concentrations of Pb and Cd as a toxic elements in the leaves and fruits of both Valencia orange and Balady mandarin results showed that the accumulated concentrations of two elements studied in the leaves were higher than both peel and pulp of fruits. 4-Results reveal that the fresh leaf weight recorded at four directions ranged between 0.81 to 0.84 gram per leaf. 5-Results reveal that leaf area were higher at the second one by about 30 % increase in leaf area. 6-Also , dry weight of leaves at the first site was about 0.39 gram/ leaf as an average, whereas at the second site at Sanboghat it was higher 24% than the first one. 7- fresh leaf weight recorded at four directions was ranged between 0.23 to 0.27 gram per leaf, and leaf area 9.4 to 11.6 cm²/ leaf 8-leaf area. were higher at the second one by about 40 % increase . 9- Dry weight of leaves where as at the second one at Sanboghat it was higher 66 % than the first one. 10 - It can be concluded that the increase of pollutants at the first site had played an important role in reducing fruit weight and number and also the expected values of yield per tree. 11- At the second site, the average of both Valencia orange and mandarin fruits gave a higher significant pulp percentage than the polluted site at EL-Gamaa. 12- The results of the peel and pulp according to the different directions of trees under EL-Gamaa site did not show any significant values It can be seen also, that eastern, western and south directions of Valencia trees at Sanboghat showed an increase in juice volume than the northern direction.