Seyyed Hossein Hosseini - Department of Chemical Engineering, Ilam University, Ilam, Iran
Amir Hosein Peyman Rad - Department of Architecture, Ilam University, Ilam, Iran
Eslam Kashi - Department of Chemical Technologies, Iranian Research Organization for Science and Technology (IROST), Tehran,Iran

In regard to wind flow in the cities, obtaining a minimal level of pollution in theenvironment is achievable. Different policies have been considered for minimizingurban pollution such as the attachment and/or reduction of building parts like airtraps, ceiling forms, and so on. Due to an increase in population in cities and anincreasing need for housing, the construction of high-rise buildings is inevitable.People are forced to live in high-rise buildings to meet their housing needs and fromlack of urban open spaces. A CFD based software, Envi-met, is used to acquireknowledge concerning the air pollution surrounding the buildings. In this case, wecan approximate that an angle of 30 degrees, in regard to an urban canyon, is thebest angle to dissipate pollution. Also, in an ideal case with imposed changes in theform, we could reduce the problem by better navigation of inside wind of urbancanyons into spaces between blocks of buildings that have the capacity to trap theparticles. Finally, it is found that we may be able to have more optimal results forthe dissipation of pollutants by suitable orientation of blocks in regard to the windflow.

Pollution ،urban block،urban canyons،TKE, CFD،Envi-met