Comparison of ISO standards on heat stress evaluation

Heat stress is an important parameter to evaluate the acceptable working environment under the condition of high temperature and high humidity. Presents six main ISO standards on heat stress evaluation in detail, analyses and compares their similarities and differences, and expounds the special application of two standards. The results show that there are some differences in the evaluation scope, evaluation principles and methods, measurement parameters and instruments. The evaluations on vehicles and special populations enlarge the applicable scope, which makes them more comprehensive and the system more complete. Presents the development of heat stress standard in China.