The present invention comprises: a first suction unit for suctioning the atmosphere through a sample line by a first vacuum pump; A sensor room installed on the sample line and in which a plurality of sensors for measuring each of a plurality of substances contained in the atmosphere sucked through the sample line are arranged; A branch line branched from the front end of the sensor room on the sample line and installed with an on/off valve; And a GC analysis unit for performing gas chromatography analysis on the atmosphere supplied through the branch line due to the opening of the on/off valve, wherein the GC analysis unit includes first and A dual sample flue including a second sample loop; A second vacuum pump providing suction power through the suction line to fill the dual sample flue with air from the branch line; A carrier gas supply line for supplying a carrier gas to the dual sample flue; A GC column that is supplied from the dual sample flue together with a carrier gas through an analysis line to separate a substance to be analyzed; A GC detector measuring an analyte separated by a GC column; And a first state in which air is filled by connecting any one of the first and second sample loops to the branch line and the suction line, and the other one of the first and second sample loops is connected to the carrier gas supply line and the analysis line. And a second state in which the filled atmosphere is supplied to the GC column together with the carrier gas, and the first and second sample loops are selectively switched to each of the first and second states. .
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