Evacuating buildings during various emergencies, such as fire or terrorist attacks, requires high awareness of the environment, quick decision-making, and immediate action. In recent years, the research has increased regarding how to support this process and persons involved by dedicated technical means. However, still, a lot of questions remain unanswered. This contribution presents a concept and the first mobile application design as part of an intuitive evacuation assistance system for evacuation leaders to improve emergency situation awareness of individual leaders and the evacuation team. Using the proposed system, the leaders will get real-time support regarding environmental hazards, evacuation procedures, extra assistance requests, the number of people in the building or their area, etc., improving the overall situation awareness. This can be achieved by a proper sensory infrastructure, intelligent algorithms building an artificial situation awareness, and a user-focused interface design, as introduced in this contribution. The analytical discussion presented in this contribution points out the strength of the concept, and the first tests of sensory infrastructure presented show feasibility for real-world applications.