The danger of poisonous gas is caused by volcanic activity, one of the toxic gases is sulfur dioxide (SO2), if inhaled by humans at a level that exceeds the dangerous level. In this study portable detection devices have been created that can monitor the condition of residential residents on the mountain slopes. This tool consists of a microcontroller (Arduino Uno) which has been equipped with a program and has been configured with hardware components such as the TGS2602 sensor which is used to detect SO2 gas and the Thermocouple type-66K Max 6675 sensor used for temperature detection. The interface used in this tool is LabVIEW, which is used to display and monitor data that has been read by the gas sensor and temperature via radio waves. The results of this study are that the system can monitor the gas level and temperature where the calibration and comparison measurements have been made with a percentage error of 0% - 0.1%, temperature with an error percentage of 0-0.03%. Assembled device applications can be used to monitor the level and temperature of SO2 gas in the mountain activity area in real time.