Abstract: In firefighting and rescue operations, firefighters must wear heavy fire suits and confront extreme working environments such as high temperatures and noise. Quantifying the safety level of human physiological status is a crucial issue for ensuring personnel safety. In this study, the method of physiological experiment is utilized. Four kinds of high temperature noise conditions were designed to measure 6 physiological indexes such as core temperature and skin temperature. The improved fuzzy comprehensive evaluation method was introduced, and three physiological state parameters (skin temperature, heart rate and systolic blood pressure) were selected by factor analysis according to the experimental results. The weights were determined by entropy weight method, and the safety level of human physiological state was finally evaluated quantitatively. The weight of heart rate and average skin temperature was relatively large. The influence of high temperature is more significant than that of noise. The combined effect of high temperature and noise on human body is more significant than that of single environmental factor. By using the improved fuzzy comprehensive evaluation method, the safety level of human physiological status is qualified.

Key words: high-temperature and noise environment, uniformed firefighter, physiological state, fuzzy comprehensive evaluation