Protective Action Distance

Protective Action Distance (PAD) refers to the calculated safe distance from a hazardous materials release at which protective measures such as evacuation or shelter-in-place should be implemented to minimize exposure risk. This distance is determined based on factors like the chemical's toxicity, quantity released, environmental conditions, and dispersion characteristics. Not to be confused with isolation distance, PAD specifically guides emergency responders and incident commanders in establishing safety perimeters within the Incident Command System (ICS) framework.