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AI Summary: Researchers at the National Institute of Standards and Technology (NIST) have developed an AI model named Safe Step, designed to identify the safest evacuation routes during a fire. Utilizing reinforcement learning, the model predicts the evolution of a fire and adjusts evacuation recommendations based on real-time sensor data, rather than relying solely on static building conditions. Safe Step incorporates a fire safety metric, the fractional effective dose (FED) of toxic gases, to determine the safest routes, consistently outperforming traditional algorithms in test scenarios. The model can be integrated with dynamic emergency exit displays to guide occupants effectively as conditions change.