A gas detector, comprising: environmental condition detection circuitry that includes one or more sensors that detect the presence or lack of presence of a particular gas in a vicinity of the gas detector; data processing circuitry; and wireless communication circuitry, wherein the gas detector is configured to be carried by a user, wherein the environmental condition detection circuitry further includes one or more temperature sensors (12, 14, 22) configured to detect a temperature in the vicinity of the gas detector and communicate temperature detection data to the data processing circuitry, wherein at least one of the one or more temperature sensors (12, 14, 22) is a biometric sensor configured to detect a body temperature of the user carrying the gas detector, and at least one of the one or more temperature sensors (12, 14, 22) is configured to detect an ambient temperature in the vicinity of the gas detector, wherein the data processing circuitry is configured to detect a hazardous temperature condition when at least one of a body temperature of the user carrying the gas detector or an ambient temperature in the vicinity of the gas detector is beyond an upper and/or lower temperature limit for a period of time beyond a time limit, wherein the environmental condition detection circuitry further includes one or more humidity sensors configured to detect a humidity in the vicinity of the gas detector, and wherein the time limit varies depending on a magnitude of the detected humidity, and wherein, in response to detection of a hazardous temperature condition, the data processing circuitry of the gas detector is configured to provide an alert notification to the user carrying the gas detector. environmental condition detection circuitry that includes one or more sensors that detect the presence or lack of presence of a particular gas in a vicinity of the gas detector; data processing circuitry; and wireless communication circuitry, wherein the gas detector is configured to be carried by a user, wherein the environmental condition detection circuitry further includes one or more temperature sensors (12, 14, 22) configured to detect a temperature in the vicinity of the gas detector and communicate temperature detection data to the data processing circuitry, wherein at least one of the one or more temperature sensors (12, 14, 22) is a biometric sensor configured to detect a body temperature of the user carrying the gas detector, and at least one of the one or more temperature sensors (12, 14, 22) is configured to detect an ambient temperature in the vicinity of the gas detector, wherein the data processing circuitry is configured to detect a hazardous temperature condition when at least one of a body temperature of the user carrying the gas detector or an ambient temperature in the vicinity of the gas detector is beyond an upper and/or lower temperature limit for a period of time beyond a time limit, wherein the environmental condition detection circuitry further includes one or more humidity sensors configured to detect a humidity in the vicinity of the gas detector, and wherein the time limit varies depending on a magnitude of the detected humidity, and wherein, in response to detection of a hazardous temperature condition, the data processing circuitry of the gas detector is configured to provide an alert notification to the user carrying the gas detector.