{
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 "constitutionVersion": "1.0.0",
 "createdAt": "2026-08-12T00:00:00Z",
 "description": "Append-only Evidence Passport records. Old revisions are immutable; corrections create a new revision and preserve the previous permalink.",
 "entity": {
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  "id": "stuttgart-luftdaten-sensors",
  "title": "luftdaten.info / Sensor.Community citizen air sensors",
  "canonicalUrl": "https://1001smartcities.org/projects/stuttgart-luftdaten-sensors/"
 },
 "currentRevisionId": "2026-08-20-source-dates",
 "revisions": [
  {
   "id": "2026-08-20-source-dates",
   "createdAt": "2026-08-20T19:29:52Z",
   "effectiveAt": "2026-07-19",
   "changeType": "baseline",
   "summary": "Created the first structured Evidence Passport with 1 claim and 5 source dossiers.",
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   },
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   },
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     "operation": "add",
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     "summary": "Added claim-level evidence mapping and source dossiers."
    },
    {
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    }
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      "publication-diff-contract",
      "material-project-fingerprint",
      "claim-text-drift",
      "source-reference-resolution",
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      "snapshot-hash"
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    },
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     "evidenceGrade": "peer-reviewed",
     "timeline": {
      "started": 2015,
      "ended": null
     }
    },
    "governance": {
     "operator": "OK Lab Stuttgart (Code for Germany)",
     "actorTypes": [
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     ],
     "fundingModel": null,
     "fundingDescription": null,
     "cost": null,
     "ownership": null,
     "decisionRights": null,
     "exitConditions": null
    },
    "claims": [
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      "field": "impact",
      "text": "independent testing found the low-cost sensors reliable enough for indicative particulate-matter mapping",
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      "mappingStatus": "mapped",
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      ],
      "supportNote": "The entry says a peer-reviewed Stuttgart evaluation followed LUBW's 2017 comparison of the SDS011 against a certified reference analyser.",
      "caveat": null,
      "interpretation": {
       "added": false,
       "interpolation": false,
       "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion."
      }
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      "claimRefs": [],
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       "exact": false
      },
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      },
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       "exact": false
      },
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      }
     },
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      "publisher": {
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       "domain": "link.springer.com",
       "classification": "not-classified"
      },
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      "language": "und",
      "role": "claim-evidence",
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       "dossierCreatedAt": "2026-08-20",
       "retrievedAt": null,
       "status": "record-date-only"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Academic evaluation of the citizen SDS011 network's data quality in Stuttgart.",
       "exact": false
      },
      "preservation": {
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       "archivedAt": null,
       "contentHash": null,
       "status": "not-captured"
      }
     },
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      "publisher": {
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       "classification": "not-classified"
      },
      "sourceType": "web-page",
      "language": "und",
      "role": "background",
      "claimRefs": [],
      "temporal": {
       "publishedAt": "2019-07-25",
       "updatedAt": null,
       "sourceCheckedAt": null,
       "recordLastVerifiedAt": "2026-07-19",
       "dossierCreatedAt": "2026-08-20",
       "retrievedAt": null,
       "status": "publication-and-record-dates-recorded"
      },
      "locator": {
       "type": "descriptive-source-note",
       "value": "Origin story: OK Lab Stuttgart founded 2014, project from 2015, co-founder Jan Lutz, SDS011 + NodeMCU.",
       "exact": false
      },
      "preservation": {
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     }
    ],
    "coverage": {
     "claimsTotal": 1,
     "claimsMapped": 1,
     "sourcesTotal": 5,
     "sourcesUsedByClaims": 1,
     "sourcesWithPublicationDate": 2,
     "sourcesWithArchive": 0,
     "sourcesWithExactLocator": 0,
     "sourcesWithContentHash": 0
    },
    "limits": [
     "Publisher names and source languages have not yet been classified; domains are recorded without guessing.",
     "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."
    ]
   }
  }
 ]
}