A device for analyzing a gaseous sample including a first housing including a detection assembly housed in the housing including a preconcentrator, a chromatography column and a detector intended to detect the presence of the separated compounds, a sampling assembly including a cartridge that is removable relative to the first housing, a control and processing unit housed in the housing and configured to execute an analysis operating mode capable of generating a first command for the detection assembly to analyze a first gaseous sample, a second command to determine the exceeding of at least one alert threshold and, if an alert threshold is exceeded, a third command for the sampling assembly to take a second gaseous sample.