The Pentagon was evacuated on Tuesday following the detection of an air quality issue involving hazardous materials. Pentagon officials reported that systems identified a problem necessitating precautionary measures to assess the severity of the situation. The nature of the hazardous material was not immediately disclosed, but emergency responders were dispatched to the scene. The evacuation impacted a portion of the building, prompting a temporary shutdown of some activities. Authorities are currently working to determine the source and extent of the air quality problem and ensure the safety of personnel. Normal operations are expected to resume once the situation is resolved and the building is deemed safe.