{
  "schema": "vedokrok.public-item.v1",
  "release_id": "MHC-RPUB-20260920-75ad787a",
  "url": "/knowledge/stop-treating-1-000-ppm-co2-as-an-ashrae-pass-fail-line",
  "id": "MHC-D-RESEARCH-0890",
  "version": "0.1.0",
  "title": "Stop treating 1,000 ppm CO2 as an ASHRAE pass/fail line",
  "summary": "A widely repeated threshold can still be misattributed.",
  "kind": "question",
  "body": "ASHRAE explicitly states that Standard 62.1 does not provide a universal indoor CO2 limit for acceptable IAQ and that claims of a 1000 ppm ASHRAE requirement are incorrect. Use building-specific ventilation guidance and trends rather than one universal traffic-light threshold.",
  "limits": [
    "Other authorities and building codes may use explicit CO2 criteria for specific purposes; follow the applicable local requirement."
  ],
  "topics": [
    "union-digital-home-office-environment"
  ],
  "intents": [],
  "source_ids": [
    "RS-864E546A7D0D437F"
  ],
  "evidence": [
    {
      "claim": "ASHRAE states Standard 62.1 does not set a universal 1000 ppm indoor CO2 limit for acceptable IAQ.",
      "source_id": "RS-864E546A7D0D437F",
      "role": "supports",
      "note": "Other authorities and building codes may use explicit CO2 criteria for specific purposes; follow the applicable local requirement.",
      "locator": "See source record"
    }
  ],
  "use_when": [
    "A dashboard colors 999 ppm green and 1001 ppm red because it claims ASHRAE requires that limit."
  ],
  "avoid_when": [
    "Other authorities and building codes may use explicit CO2 criteria for specific purposes; follow the applicable local requirement."
  ],
  "example": "A home office hitting 1050 ppm is a reason to inspect ventilation, not proof that an ASHRAE safety limit was crossed.",
  "check": "CO2 thresholds are cited to the correct standard and purpose rather than folklore.",
  "question": "Which standard or building requirement actually applies? · Is the number absolute indoor CO2 or a differential above outdoors? · Is the goal ventilation management, cognition research or a regulatory exposure limit?",
  "sources": [
    {
      "id": "RS-864E546A7D0D437F",
      "title": "ASHRAE Position Document on Indoor Carbon Dioxide",
      "url": "https://www.ashrae.org/file%20library/about/position%20documents/pd-on-indoor-carbon-dioxide-english.pdf"
    }
  ],
  "relations": [],
  "collections": [
    {
      "id": "RC-112961CC8EF10888",
      "title": "Make the environment carry more of the focus load",
      "url": "/collections/make-the-environment-carry-more-of-the-focus-load"
    }
  ]
}