Twenty three aerophytic blue-green algal species were isolated and
identified from 5 districts in Cairo, namely: Nasr City, Abassiya, Downtown,
Maadi and Tebbin. Downtown contained the highest numbers of total algal
species (13 species) during the study throughout the years 2004-2005 in
comparison to other districts. The composition of aeroalgal taxa varied
with seasonal changes. Chroococcus limenticus, Lyngbya lagerheimii,
Phormidiumambigum and Schizothrix purpurascens have
been isolated during the both years 2004-2005, while the rest of algal
species (nineteen species) have been trapped either in 2004 or 2005. Nostoc
spp. is the most common isolate of all algal isolates during the study.
Analysis of air pollutants such as SO2, NO2, suspended
particles less than 10 μ (PM10), black smoke and lead
are also recorded. Downtown showed the highest concentration of SO2,
NO2 and PM10 level during the present study in comparison
to other sites. The interaction between air pollutants and aerophytic
Cyanophyceae species was concerned.