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Biotic and abiotic pollution is threatening the human health in crowded cities. Heavy metals and fungal pollution is increasing in urban environments. This study aims at assessing the efficiency of the two common street trees Ficus nitida and Conocarpus erectus in intercepting heavy metals and fungal aerosols in the air of Cairo and Riyadh cities. The results showed higher levels of heavy metals in air of Cairo than in Riyadh. The fungal species diversity in the two cities increased during summer than in winter season. The highest concentration of Ni was recorded in Cairo with maximum value in Tahrir site which reached 0.332 mg g -1 , while in Riyadh the maximum value recorded in Solimania area 0.0431 mg g -1 for Ni and Cd. Alternatively, the lowest value of heavy metals in summer recorded for Cd reached 0.004 mg g -1 in Maadi area and in Riyadh 0.0012 mg g -1 in Al-mazar area. The fungal species diversity and counts were variable depending on the climatic factors. Temperature is a major factor affecting the seasonal variations in fungal aerosols, while humidity and wind have minor effect. The air quality in Cairo was found to be more polluted than in Riyadh city.

Comparative Study ofFungal Diversity and Heavy MetalContent in Street Trees in Cairo and RiyadhCities