摘要：The walking passengers are needy of safe transition across the streets, so pedestrian could change their places from side to another side easily, but, the concern of chemical pollution, makes great challenge, hence, the most important questions in this research are: 1- What are the most important challenges facing the people's health who use the underground pedestrian passages?; 2- What is the citizen's opinion about the environmental conditions of this place?. The results of studies show the subjective conditions are much worse than objective conditions, which discourages the passenger of using underground pedestrian passages.
