Which type of information is NOT typically necessary to communicate with emergency responders?

Understanding the types of information that are most relevant for emergency responders during an incident in the laboratory is crucial for ensuring a swift and effective response. The selection that is not typically necessary to communicate is the incident history in the lab.

Emergency responders prioritize immediate safety and control of the situation; they need to know about ongoing hazards such as hazardous materials involved, how the incident happened—this helps in assessing the risk and planning actions—and any other hazards that may compound the situation. The focus is on the current circumstances rather than previous incidents that may not directly impact the immediate response required.

Thus, while an incident history may be useful for long-term safety management and prevention strategies, it does not provide urgent, actionable information that responders require to mitigate the present danger.