{
  "id": "disaster/volcano-mask-wet-cloth-myth",
  "signature": "AI advises using a wet cloth over the mouth during a volcanic ashfall (ash clogs pores and causes suffocation)",
  "signature_zh": "AI 建议在火山灰降落时用湿布捂住口鼻（灰烬堵塞孔隙导致窒息）",
  "regex": "wet.*cloth.*volcanic.*ash|wet.*towel.*ashfall|damp.*cloth.*volcano",
  "domain": "disaster",
  "category": "life_threatening",
  "subcategory": null,
  "root_cause": "A wet cloth quickly becomes clogged with fine volcanic ash particles, creating an airtight seal that causes suffocation; dry N95 or P100 respirators are required because ash contains crystalline silica that damages lungs.",
  "root_cause_type": "generic",
  "root_cause_zh": "湿布迅速被细火山灰颗粒堵塞，形成气密密封导致窒息；需要干燥的N95或P100呼吸器，因为灰烬含有结晶二氧化硅，会损伤肺部。",
  "versions": [
    {
      "version": "CDC NIOSH N95 Standards",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    },
    {
      "version": "USGS VHP Ashfall Guide v3.1",
      "introduced": null,
      "deprecated": null,
      "removed": null,
      "behavior_change": null,
      "status": "active"
    }
  ],
  "os_specific": {},
  "dead_ends": [
    {
      "action": "",
      "why_fails": "Moisture causes ash to form a cement-like paste that seals the fabric pores, preventing any airflow.",
      "fail_rate": 0.95,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Wet cloths do not filter fine crystalline silica particles (less than 10 microns), which cause silicosis.",
      "fail_rate": 0.9,
      "condition": "",
      "sources": []
    },
    {
      "action": "",
      "why_fails": "Users may think they are protected and stay in ashfall longer, increasing cumulative exposure.",
      "fail_rate": 0.85,
      "condition": "",
      "sources": []
    }
  ],
  "workarounds": [
    {
      "action": "Use a dry N95 respirator (e.g., 3M 8210) or P100 filter; ensure a tight seal around the nose and mouth. Replace filters every 8 hours of exposure.",
      "success_rate": 0.9,
      "how": "Use a dry N95 respirator (e.g., 3M 8210) or P100 filter; ensure a tight seal around the nose and mouth. Replace filters every 8 hours of exposure.",
      "condition": "",
      "sources": []
    },
    {
      "action": "If no respirator is available, use a dry surgical mask with a layer of dry cotton cloth, but limit outdoor exposure to under 30 minutes.",
      "success_rate": 0.7,
      "how": "If no respirator is available, use a dry surgical mask with a layer of dry cotton cloth, but limit outdoor exposure to under 30 minutes.",
      "condition": "",
      "sources": []
    },
    {
      "action": "Create a DIY mask with a dry HEPA vacuum bag cut to shape and secured with rubber bands; do not wet the bag material.",
      "success_rate": 0.75,
      "how": "Create a DIY mask with a dry HEPA vacuum bag cut to shape and secured with rubber bands; do not wet the bag material.",
      "condition": "",
      "sources": []
    }
  ],
  "workarounds_zh": [
    "Use a dry N95 respirator (e.g., 3M 8210) or P100 filter; ensure a tight seal around the nose and mouth. Replace filters every 8 hours of exposure.",
    "If no respirator is available, use a dry surgical mask with a layer of dry cotton cloth, but limit outdoor exposure to under 30 minutes.",
    "Create a DIY mask with a dry HEPA vacuum bag cut to shape and secured with rubber bands; do not wet the bag material."
  ],
  "transition_graph": {
    "leads_to": [],
    "preceded_by": [],
    "frequently_confused_with": []
  },
  "official_doc_url": "https://www.cdc.gov/disasters/volcanoes/ash.html",
  "official_doc_section": null,
  "error_code": null,
  "verification_tier": "ai_generated",
  "confidence": 0.87,
  "fix_success_rate": 0.8,
  "resolvable": "partial",
  "first_seen": "2024-08-15",
  "last_confirmed": "2024-06-01",
  "last_updated": "2024-06-01",
  "evidence_count": 1,
  "tags": [],
  "locale": "en",
  "aliases": []
}