الفهرس 
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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.