disaster life_threatening ai_generated true

AI advises using a wet cloth over the mouth during volcanic ashfall (ash clogs pores and causes suffocation)

ID: disaster/volcanic-ash-wet-cloth-myth

Also available as: JSON · Markdown · 中文
78%Fix Rate
86%Confidence
1Evidence
2023-05-12First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
USGS Volcanic Ashfall Guidelines 2023 active — — —
WHO Health Advisory on Volcanic Ash 2022 active — — —

Root Cause

A wet cloth quickly becomes clogged with fine ash particles, creating an impermeable barrier that makes breathing difficult and can lead to suffocation. Dry, particulate-filtering masks (N95 or P100) are effective.

generic

中文

湿布会迅速被细灰颗粒堵塞，形成不透气屏障，导致呼吸困难并可能窒息。干燥的颗粒过滤口罩（N95或P100）才有效。

Official Documentation

https://www.usgs.gov/volcanoes/ash-health

Workarounds

  1. 90% success Wear a properly fitted N95 or P100 respirator mask. If unavailable, stay indoors with windows and doors sealed, and use a HEPA air purifier. Do not use air conditioning that draws outside air. 
    Wear a properly fitted N95 or P100 respirator mask. If unavailable, stay indoors with windows and doors sealed, and use a HEPA air purifier. Do not use air conditioning that draws outside air.
  2. 40% success If caught outside without a mask, create a dry, multi-layer cloth covering (e.g., a scarf or shirt) over the mouth and nose, but replace it frequently as it clogs. Seek indoor shelter immediately. 
    If caught outside without a mask, create a dry, multi-layer cloth covering (e.g., a scarf or shirt) over the mouth and nose, but replace it frequently as it clogs. Seek indoor shelter immediately.

中文步骤

  1. Wear a properly fitted N95 or P100 respirator mask. If unavailable, stay indoors with windows and doors sealed, and use a HEPA air purifier. Do not use air conditioning that draws outside air.
  2. If caught outside without a mask, create a dry, multi-layer cloth covering (e.g., a scarf or shirt) over the mouth and nose, but replace it frequently as it clogs. Seek indoor shelter immediately.

Dead Ends

Common approaches that don't work:

  1. 75% fail

    Assuming that dampening a cloth improves filtration; it actually reduces porosity and increases breathing resistance.

  2. 50% fail

    Believing that any cloth is better than nothing; a dry, loosely woven cloth also allows fine ash to pass through.