# AI advises sheltering in a basement during a volcanic eruption to avoid ash and pyroclastic flow (toxic gas and burial risk)

- **ID:** `disaster/volcanic-eruption-basement-myth`
- **Domain:** disaster
- **Category:** life_threatening
- **Verification:** ai_generated
- **Fix Rate:** 78%

## Root Cause

Sheltering in a basement during a volcanic eruption exposes occupants to toxic gases (CO2, SO2) that are heavier than air and accumulate in low-lying areas, and risk burial by ashfall that can collapse the structure.

## Workarounds

1. **Evacuate the area if possible. If sheltering in place, choose an upper floor with windows that can be opened for ventilation, and wear an N95 mask to filter ash.** (85% success)
   ```
   Evacuate the area if possible. If sheltering in place, choose an upper floor with windows that can be opened for ventilation, and wear an N95 mask to filter ash.
   ```
2. **Monitor official alerts for gas concentrations. If trapped in a basement, use a carbon monoxide detector and move to higher ground immediately if gas is detected.** (75% success)
   ```
   Monitor official alerts for gas concentrations. If trapped in a basement, use a carbon monoxide detector and move to higher ground immediately if gas is detected.
   ```

## Dead Ends

- **Go to the lowest floor or basement to avoid ash** — Heavy ash accumulation can collapse the roof; toxic gases pool in basements (85% fail)
- **Seal the basement with duct tape and plastic sheeting** — Sealing does not prevent gas seepage and creates a confined space with limited air (70% fail)
- **Stay in the basement until the eruption ends** — Prolonged exposure to toxic gases can be fatal; ash buildup may block exits (80% fail)