Urban sewage pipes are filled with flammable, explosive, toxic and other noxious gases, which have broughthidden troubles during system maintenance and operation. To ease these threats to the urban sewagepipeline network, we should perform spot inspection and take some measures against safety risks that mayoccur on them. But of those, the test of noxious gases is the most challenging. Based on the odorclassification method, we take an urban sewage pipe network in Chongqing as a study case for samplecollection and spot inspection. The purpose of this paper is to classify and test the methane CH4 andhydrogen sulfide H_2S by different methods. Data available from individual supervision spots are comparedand analyzed in parallel, in order to explore how to measure these noxious gases and what’s the distributionand concentration change laws of them in urban sewage pipes, hoping to provide the clues to the earlywarning and safety operation of urban sewage pipeline network.
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