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Abstract This study investigates the effect of applying acoustic treatments inside two selected underground stations in the Greater Cairo Metro Network where platform noise levels reach unacceptable limits. Improving the acoustic environment inside the selected stations took in two procedures; firstly, evaluating the acoustical environment inside by field measurements for two acoustical indicators; Reverberation Time and Sound pressure levels, to be compared with standard noise limits. Secondly, underground stations techniques of noise control at the path are reviewed and applied in two acoustical models of the selected stations on platform areas using ODEON4.2 software to measure the effect of applying several acoustic treatments on noise reduction on stations platform. Finally, a graph was plotted to show the relation of the sound absorption materials area versus the corresponding noise reduction on the selected stations platform levels. Results showed that Ceiling and underplatform locations were found to be the best treatment locations that àºlÀv train noise in the selected stations; As under-platform location is the nearest to the noise source, thus reducing noise before reflecting into the space, while the treatments located at the ceiling reduce reverberation time and crowds’ noises. |