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  "title": "Air Quality Monitoring Network",
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      "text": "the health ministry's advice to keep young children home on hazardous-air days is a recommendation, not a rule",
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     "sourcesTotal": 5,
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     "Existing source notes are descriptive locators, not page- or paragraph-exact citations.",
     "A missing archive, publication date or content hash is shown as null rather than inferred.",
     "The project-level evidence grade ranks the strongest source in the entry; it is not a truth score for every claim."
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      "text": "a 2024 stocktake counted 61 monitoring stations across state and private operators — 35 of them the city's",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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      "field": "snippet",
      "text": "only six are reference-grade fixed stations",
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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      "text": "a station lost on average 50 days of data a year",
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      "interpretation": {
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       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
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      "field": "snippet",
      "text": "the portal itself was unreachable because its domain registration had expired",
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      "supportNote": "Both reports document that moitruongthudo.vn went offline during the late-November 2025 smog because the domain registration had expired; it was later restored.",
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      "text": "the health ministry's advice to keep young children home on hazardous-air days is a recommendation, not a rule",
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      "supportNote": "The ministry recommends that kindergarten and primary pupils stay home when AQI stays hazardous (301–500) for three consecutive days — guidance to schools and parents, with no automatic mechanism attached.",
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