Which incident type presents the highest level of alertness in alarm responses?

The incident type that presents the highest level of alertness in alarm responses is a major emergency. This is because major emergencies typically involve significant threats to life, property, or safety, such as serious fires, active shooter situations, or large-scale hazardous material spills. In these scenarios, an immediate and coordinated response is crucial, and alarm systems are designed to trigger heightened awareness and rapid action from emergency personnel and responders.

Responders to major emergencies must be prepared for life-threatening situations, making it essential to prioritize these incidents over others. This heightened level of alertness ensures that appropriate resources are mobilized quickly, and individuals in the area receive timely notifications to take protective measures.