Survive Nuclear Fallout Quiz

FEMA guidance says you have roughly 10–15 minutes to get inside before fallout begins to arrive. Go inside the nearest substantial building — concrete, brick, or underground are best. Move to the center of the building and go as low as possible (a basement is ideal). Once inside, stay away from windows, seal gaps in doors and windows if possible, and remain sheltered for at least 24 hours. Remove and bag your outer clothing immediately upon entering — this alone can reduce contamination by up to 90%. Do not use conditioner in your hair, as it can trap radioactive particles.

Yes, though most are no longer maintained. At the peak of the Cold War the United States had over 100,000 designated fallout shelters stocked with supplies. Today most of those supplies have long since expired and the shelters are not actively maintained by the government. Switzerland is a notable exception — it has fallout shelter capacity for over 114% of its population, with shelters required by law in most new buildings. FEMA now emphasizes improvised shelter-in-place as the most realistic strategy for most Americans.

Survival depends heavily on your proximity to ground zero and your actions in the first 24 hours. Most people outside the immediate blast radius who shelter promptly can survive the acute radiation phase. However, a large-scale nuclear exchange raises the specter of nuclear winter — a theory popularized by Carl Sagan in the 1980s — in which soot and debris block sunlight for months or years, collapsing agriculture and causing mass starvation. The Doomsday Clock, maintained by the Bulletin of the Atomic Scientists, stood at 90 seconds to midnight in recent years — its closest setting ever — reflecting the ongoing real risk.