الفهرس 
INTRODUCTIONOnly 14 pages are availabe for public view
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Abstract
Most of tree species can help to alleviate air pollution. The various toxic chemicals resulted from factories may be poisonous or injurious to human or other organisms (animals and plants). Some pollutants such as sulphur dioxide, lead, mercury, carbon dioxide and nitrogen peroxides are concentrated in the air throughout the years. Two fully crowded streets in El-Giza Governorate (El-Gamaa and El-Tahreer Streets) were chosen as the planted trees of each were an indicator of air pollution. Ficus nitida, Peltphorum africanum, Delonix regia and Pterocarpus dalbergoides were planted in El-Gamaa Street, while Ficus nitida, Bombax malabricum, Ficus benjamina and Washingtonia robusta were planted in El-Tahreer Street. Numbers of the transportation vehicles/h were recorded in three times by day.
The main reasons of air pollution (SO2, NO2, and CO) were recorded by Faculty of Agriculture Station. Temperature (high, avg and low), relative humidity% (high, average and low) and wind velocity (km/ha) were recorded by Central Laboratory for Agricultural Climate. The leaf parameters and deposited dust/leaf size and dry weight of leaf were determined. Data obtained were: nitrogen and total carbohydrates (%) in leaves, lead, silicon and sulphur content (mg/100g) in deposited dust. Data were taken in four seasons’ i. e. spring, summer, autumn and winter. Three trees of each species were replicated three times. The leaf samples were taken and dried for chemical analysis.
from the obtained results it was obvious that Peltophorum africanum has the superior ability to accumulate both nitrogen and total carbohydrates. Spring and winter seasons were suitable to accumulate nitrogen and carbohydrates in El-Gamaa Street. However, Bombax malabaricum was the best in condensation of nitrogen in El-Tahreer Street during summer. Ficus benjamina was the best in accumulation of total carbohydrates in El-Tahreer Street especially in spring season. Ficus nitida was superior for accumulating sulphur in both streets during summer and autumn seasons while, Peterocarpus dalbergoides in El-Gamaa Street was the best for condensating both sulphur and lead during spring, summer and autumn. Washingtonia roubuta had high ability for condensation of sulphur in both summer and autumn in El-Tahreer Street. Delonix regia in both streets was more efficient to accumulate silicon and lead during summer and autumn seasons.