What is a significant danger to people inside buildings related to chemical incidents?

The significant danger to people inside buildings related to chemical incidents encompasses both explosions and exposure to toxic gases. Chemical incidents can lead to the release of hazardous substances, posing multiple risks. Explosions can occur due to volatile chemicals igniting or reacting dangerously, which can cause physical harm, structural damage, and chaos within a building. Additionally, exposure to toxic gases is a serious risk that can lead to health issues, including respiratory distress, poisoning, and long-term health effects.

Recognizing that both of these threats can arise from a single incident is crucial for safety training and emergency response planning. It is essential for individuals in and around such environments to be aware of both types of hazards to effectively prepare and respond in the event of a chemical emergency. Thus, the correct answer highlights the comprehensive nature of dangers posed by chemical incidents in enclosed spaces.