Abstract: A system and method are disclosed for alerting safety personnel of unsafe air temperature conditions. The system includes a temperature sensor exposed to the ambient environment, a temperature indicator disposed in a field of view of safety gear such as a face mask, and a control unit. The temperature indicator and the control unit may be disposed in a protected location, such as within the face mask. The control unit may produce warnings based on detected temperatures and exposure time thresholds. Detected temperatures may also be recorded, along with positioning information, such as GPS data, to facilitate mapping of temperature gradients. At startup, the system may automatically execute a battery check and produce a warning if insufficient charge remains to provide a predetermined operating time. Various embodiments may use an arm to keep the temperature indicator within the field of view or a single screw attachment to a face piece.