In which situation would shelter-in-place be preferred over evacuation?

In which situation would shelter-in-place be preferred over evacuation?

• A. When evacuation would create more risk than sheltering in place
• B. When there is a large outdoor plume moving toward the population
• C. When the hazard is contained, not likely to contaminate air outside, or evacuation would create more risk
• D. When the area is small and the population is minimal

Answer: (C)

Shelter-in-place is chosen when the hazard can be kept outside of the living space or when moving people out would create more danger than staying put. The best description here says the hazard is contained, not likely to contaminate outdoor air, or that evacuating would introduce greater risk. That matches the practical use: if the release stays localized and indoor environments can protect people, or if driving people through potentially contaminated air or through hazardous conditions would raise overall risk, staying inside is safer.

The other scenarios are less precise. Evacuation creating more risk is a valid consideration, but that’s only part of the story and doesn’t specify whether outdoor air would be contaminated or whether the hazard remains contained. A large outdoor plume moving toward people could justify sheltering, but without stating whether outdoor air is contaminated or evacuation risk, it’s not as definitive as the stated condition. A small area with few people doesn’t automatically require sheltering; decisions depend on containment and risk of movement, not just size.