Vehicle emissions have been considered as a main source of air pollution contaminants. Air pollution is a severe problem which could cause many health issues, such as respiratory, infections, lung cancer, and heart disease, according to the World Health Organization (WHO). In urban area, highway transportation is the main and busy traffic that contains all types of vehicles and release multiple pollutants. Studies of highway contaminants influence have been carried out by different methods, such as field study, wind tunnel and computational fluid dynamics (CFD). Among all the methods, CFD is respectively both economical and accurate. For CFD method, in order to have a most accurate results, all the factors including terrain, wind profile, and other features in the studied area should be included. In this study, noise barrier effect is the main feature being analyzed. Different barrier heights were modelled and simulated in order to see the effect of barrier height. Situations with and without barriers were compared to get the general influence of noise barriers. Simulations were accomplished by using commercial software ANSYS 15.0. Simulated species are nitrogen oxides (NOx), including NO and NO2, carbon monoxide (CO). Double barriers configuration were modelled. A model of local high school system was built to see the difference of concentration in far wake region behind the barriers. Comparison has been made between with and without barriers. As the results of this study, a significant reduction was found in far wake area due to noise barriers. Effected flow distribution and contaminants concentration was found due to different barriers heights. Flow distribution and pollutants concentration has been depicted and analyzed. The effect has been analyzed by studying flow and wind velocity distribution.

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