fig3 hereinafter the second exemplary embodiment of the present invention will be described in comparison to the first exemplary embodiment of the present invention the system of fig3 includes the detour channel 100 is provided with a particle agglomerator 180 the particle agglomerator 180 agglomerates particulate matter flowing into the detour channel 100 under the control of the control unit 40 as shown in fig4 the particle agglomerator 180 includes a first electrode 190 which ionizes the particulates by discharging sparks and a second electrode 200 which attracts the ionized particulates with an electrical attractive force and agglomerates the particulates the rear portion of the detour channel 100 is open as such agglomerated particles flow into the diesel particulate filter through the detour channel 100 rejoining other exhaust gases in being filtered by filter 170 and then releasing into the air according to an exemplary embodiment of the present invention particulates in the exhaust gas can be filtered using a small amount of electricity and thereby reduce air pollution originating from vehicle emissions in addition according to an exemplary embodiment of the present invention only small particulate matters included in the exhaust gas are respectively agglomerated and filtered by a diesel particulate filter and thus exhaust gas pressure can be maintained.