Exhaust gas processing system

Waste gas treatment according to an embodiment of the present invention system, the exhaust gas is installed in through the exhaust line, one side of the exhaust line is provided on the downstream side of the nitrogen oxide purification catalyst, and the nitrogen oxide purification catalyst for reducing the nitrogen oxides filtering particulate matter contained in exhaust gas, a diesel particulate filter to remove it from the set condition; And wherein the diesel particulate filter may include an oxygen storage material to store oxygen in the set amount.