A gas measuring device, comprising - a control unit, - a gas sensor module, - a radio receiving unit, - a first radio transmitting unit - and a second radio transmitting unit, wherein the control unit is designed, in a first operating state, - to capture sensor data by means of the gas sensor module and to detect a potential hazard state on the basis of the sensor data - and to switch to a second operating state when the hazard state is detected, wherein the control unit is further designed, in the second operating state, - to detect, by means of the radio receiving unit, one or more radio signals which indicate respective identifiers of respective portable transmitting units, - and to determine, on the basis of the radio signals, which of the transmitting units have a sufficient spatial proximity to the gas measuring device and to provide the identifiers of the sufficiently proximal transmitting units via the first radio transmitting unit, wherein the gas measuring device further comprises an audio capturing unit (Ml) and/or an image capturing unit, and wherein the control unit is further designed, in the presence of the second operating state, to capture audio data by means of an audio capturing unit (Ml), and/or visual data by means of the image capturing unit, with respect to a spatial environment of the gas measuring device, and to provide these, via the second radio transmitting unit, as additional information regarding identifiers of the transmitting units. comprising - a control unit, - a gas sensor module, - a radio receiving unit, - a first radio transmitting unit - and a second radio transmitting unit, - a control unit, - a gas sensor module, - a radio receiving unit, - a first radio transmitting unit - and a second radio transmitting unit, wherein the control unit is designed, in a first operating state, - to capture sensor data by means of the gas sensor module and to detect a potential hazard state on the basis of the sensor data - and to switch to a second operating state when the hazard state is detected, - to capture sensor data by means of the gas sensor module and to detect a potential hazard state on the basis of the sensor data - and to switch to a second operating state when the hazard state is detected, wherein the control unit is further designed, in the second operating state, - to detect, by means of the radio receiving unit, one or more radio signals which indicate respective identifiers of respective portable transmitting units, - and to determine, on the basis of the radio signals, which of the transmitting units have a sufficient spatial proximity to the gas measuring device and to provide the identifiers of the sufficiently proximal transmitting units via the first radio transmitting unit, - to detect, by means of the radio receiving unit, one or more radio signals which indicate respective identifiers of respective portable transmitting units, - and to determine, on the basis of the radio signals, which of the transmitting units have a sufficient spatial proximity to the gas measuring device and to provide the identifiers of the sufficiently proximal transmitting units via the first radio transmitting unit, wherein the gas measuring device further comprises an audio capturing unit (Ml) and/or an image capturing unit, and wherein the control unit is further designed, in the presence of the second operating state, to capture audio data by means of an audio capturing unit (Ml), and/or visual data by means of the image capturing unit, with respect to a spatial environment of the gas measuring device, and to provide these, via the second radio transmitting unit, as additional information regarding identifiers of the transmitting units.