G. Nersisyan, H. Hovhannisyan;                             In book “Biotechniques for Air Pollution Control”, ed. by J.Bartacek, S.Kennes and P.Lens, CRC Press, Taylor and Francis Group, UK, London,                             2010,                                                         pp. 309-316;                                                     
One of pollutants of Yerevan’s atmosphere is chlorine (Cl) and its compounds, which basic sources are chemical plants operating on the city’s territory. The goal of this research was to reveal arboreous species with good indication and phyto-melioration properties in respect to chlorine-containing compounds so as to use them in controlling and cleaning up the air of Yerevan. The research was performed between 2005 and 2007. The studied objects were the soils and leaves of 5 arboreous species. The soils were low in chlorine, whereas the plants displayed high concentrations varying 0,50 to 1,77%. The produced schematic maps of chlorine distribution allover the city’s territory allowed indication of the most polluted zones located mostly in the south and southwestern parts of the city as well as on some sites in the direction of the rose wind. To control ambient air pollution with chlorine the best testing systems are found out to be the leaves of Robinia pseudoacacia L. and as the most efficient phytofilters Robinia pseudoacacia L. and Fraxinus excelsior L. can be used. The research outcomes were included in the Functional Tree Planting Program for the city of Yerevan.
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