{ "schemaVersion": "1.0.0", "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": { "type": "project", "id": "bristol-clean-air-zone", "title": "Bristol Clean Air Zone (Class D)", "canonicalUrl": "https://1001smartcities.org/projects/bristol-clean-air-zone/" }, "currentRevisionId": "2026-08-25-bristol-baseline", "revisions": [ { "id": "2026-08-25-bristol-baseline", "createdAt": "2026-08-25T10:00:00Z", "effectiveAt": "2026-08-25", "changeType": "baseline", "summary": "Created the first structured Evidence Passport with 16 claims and 7 source dossiers.", "preparedBy": { "type": "automation", "label": "AI-assisted evidence preparation", "humanApproved": false }, "review": { "status": "unreviewed", "by": null, "date": null, "note": "Awaiting operator and domain-expert review; publication of this revision implies neither." }, "changes": [ { "operation": "add", "path": "/evidencePassport", "summary": "Added claim-level evidence mapping and source dossiers." }, { "operation": "add", "path": "/revisionHistory", "summary": "Established a permanent, hash-addressed baseline revision." } ], "snapshotHash": "sha256:e3ae9d8628f2d075a0723ee9067fa721686a5a2b37dce897cb3fd83ca1c7ba24", "snapshot": { "asOf": "2026-08-25", "projectFingerprint": "sha256:3f9bf134631bdd54feed50c78de803a484e3ef3f1e01d35bc3152e268871b9b5", "assurance": { "status": "unreviewed", "scope": "evidence-passport-revision", "statement": "AI-assisted structural preparation. This revision has not been reviewed by a human or subject-matter expert.", "machineChecks": [ "schema", "publication-diff-contract", "material-project-fingerprint", "claim-text-drift", "source-reference-resolution", "complete-source-dossier", "snapshot-hash" ] }, "projectState": { "status": "live", "outcome": "ongoing", "evidenceGrade": "official", "timeline": { "started": 2022, "ended": null } }, "governance": { "operator": "Bristol City Council", "actorTypes": [ "city-government", "national-government" ], "fundingModel": "public", "fundingDescription": "UK government (Joint Air Quality Unit) grant funding, then charge revenue", "cost": null, "ownership": null, "decisionRights": null, "exitConditions": null }, "claims": [ { "id": "clm-f3a0cb386db0ff2f", "field": "snippet", "text": "Charging began on 28 November 2022", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b6d1b4390e951ee6" ], "supportNote": "The change history on the government's Clean Air Zone guidance carries the entry 'Bristol will start charging on 28 November 2022', and a further entry dated 28 November 2022 recording that the zone 'is now in operation'.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-ff098ea2dfd89943", "field": "snippet", "text": "in a zone of 1.18 square miles around Bristol's centre", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b6d1b4390e951ee6" ], "supportNote": "The government's table 'Cities with Clean Air Zones' lists City, Class and Area (square miles), and gives the Bristol row as D and 1.18. The value 1.18 appears once on the page.", "caveat": "The figure is the area the government publishes for the zone; the council's own pages describe the boundary by map rather than by area.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-0a2cbff532aebde3", "field": "snippet", "text": "£9 a day for a non-compliant car, taxi or van, £100 for a lorry, bus or coach", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-1a5516d880c4593e" ], "supportNote": "The council's charge table gives 'Private petrol cars £9, Private diesel cars £9, Taxis £9, Light Goods Vehicle (under 3.5t.) £9, Heavy Goods Vehicle (over 3.5t.) £100, Buses £100, Coaches £100'. The charge is payable only if the vehicle does not meet the zone's emissions standards.", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-f7603117e6eda141", "field": "snippet", "text": "24 hours a day and every day of the year", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-1a5516d880c4593e", "src-b6d1b4390e951ee6" ], "supportNote": "The council states 'Charges apply 24 hours a day, midnight to midnight, 365 days of the year.' The government guidance says the same of all English zones: 'The zones operate 24 hours a day, 7 days a week, every day of the year.'", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-48728df008e1385e", "field": "snippet", "text": "enforced by automatic number plate recognition cameras", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-688a5c6fb10e6dfa" ], "supportNote": "The council's exemptions page states 'The Clean Air Zone is managed by cameras with Automatic Number Plate Recognition (ANPR)', and adds that the ANPR system recognises exempt vehicles automatically.", "caveat": "The council does not publish a camera count on this page. A figure of 49 cameras circulates in a supplier case study published by ITS UK on behalf of Intelliscape; it is vendor material and is deliberately not carried in this entry.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-7e836fa729f15980", "field": "snippet", "text": "It is a Class D zone — of England's seven Clean Air Zones, only Bristol and Birmingham charge private cars", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-b6d1b4390e951ee6", "src-efb0b9ae9b251edd" ], "supportNote": "The government's table lists all seven English zones with their class: Bath C, Birmingham D, Bradford C, Bristol D, Portsmouth B, Sheffield C, Tyneside C. The class definitions give Class D as 'Buses, coaches, taxis, private hire vehicles, heavy goods vehicles, vans, minibuses, cars' — the only class that reaches cars. Bristol's own status report also calls it 'A Class D Clean Air Zone (CAZ)'.", "caveat": "This counts only the Clean Air Zone framework. London's Ultra Low Emission Zone also charges cars but is a separate scheme run by the Mayor of London, and the same government page says so; Greater Manchester was directed to a zone that never began charging.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-99b8af652e468798", "field": "snippet", "text": "Bristol did not choose it; the Secretary of State directed it", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-bfc46f6d725e81e9", "src-efb0b9ae9b251edd" ], "supportNote": "The Direction was made by the Secretary of State under section 85(5) of the Environment Act 1995 and requires the authority to implement its local plan for NO2 compliance. Bristol's own status report states 'Bristol City Council has been directed by the UK Government to achieve compliance with air quality objectives in the shortest possible time. A Class D Clean Air Zone (CAZ) came into operation in November 2022 in order to achieve compliance.'", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-b2e54d2a9ecc6670", "field": "impact", "text": "an average fall of 13.2% in annual NO2 across 191 locations between 2022 and 2023, the zone's first year", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-efb0b9ae9b251edd" ], "supportNote": "The status report's conclusions state 'Out of the 191 NO2 monitoring locations with data for both 2022 and 2023, 176 showed a reduction in annual NO2 levels in 2023 when compared to 2022. On average, annual NO2 concentrations fell by 13.2% between 2022 and 2023.'", "caveat": "The council's own figure and not an independent estimate, and the same report warns that annual concentrations 'can be impacted significantly year on year by factors such as the prevailing meteorological conditions'. It says the data suggests the zone contributed to the fall, not that it caused all of it.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-3d0dad9fca3b75a3", "field": "impact", "text": "a further 4.7% between 2023 and 2024", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-efb0b9ae9b251edd" ], "supportNote": "The same section states 'There were 191 locations across Bristol where NO2 concentrations were measured in 2023 and 2024. At these locations, on average, NO2 concentrations fell by 4.7%.'", "caveat": "The report also records that NO2 rose at 43 of the 191 locations in 2024, 19 of them by less than 1 microgram per cubic metre.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-b464de7a95538d85", "field": "impact", "text": "The Direction had required compliance by 2023 at the latest", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-bfc46f6d725e81e9" ], "supportNote": "Article 4(2)(a) of the Direction requires the authority to ensure the local plan is implemented so that 'compliance with the legal limit value for nitrogen dioxide is achieved in the shortest possible time, and by 2023 at the latest'. Schedule 1 gives the deadline for the Class D zone itself as 'To be implemented as soon as possible and at least in time to bring forward compliance to 2023.'", "caveat": "The Direction's deadline is for the limit value that Defra assesses nationally; the council's diffusion-tube monitoring reported below is the separate Local Air Quality Management regime. The two are related but not the same test.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-7ca4780c86be7539", "field": "impact", "text": "Five monitoring sites were still above the 40µg/m3 annual objective in 2024", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-efb0b9ae9b251edd" ], "supportNote": "The conclusions state '2024 monitoring data shows that NO2 concentrations have continued to fall when compared to 2023, however, five monitoring sites were still above the legal objective for nitrogen dioxide in 2024.' The report names the objective elsewhere as 'the UK annual objective of 40µg/m3 for nitrogen dioxide' and names sites including College Green/Anchor Road at 41.0µg/m3, Old Market Roundabout at 41.6µg/m3 and Rupert Street at 45.4µg/m3.", "caveat": "The report attributes some individual exceedances to non-road sources or to monitoring positions that are not places of relevant exposure, so the count is not by itself a statement that people are exposed above the limit at five locations.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-d70b4e120d7d5059", "field": "impact", "text": "the council's own progress table records the measure as \"Compliance not yet achieved\"", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-efb0b9ae9b251edd" ], "supportNote": "In the report's table of progress on measures, the row for the clean air zone measure 'Achieving Compliance within the shortest timeframe possible' carries the status text 'CAZ introduced in November 2022. For latest developments see https://www.cleanairforbristol.org/ Compliance not yet achieved. Further measures being investigated with JAQU through their Triage Process.'", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-f5882bdac739ebd8", "field": "impact", "text": "Charges and penalties raised more than £26 million after operating costs in the first year", "statementKind": "quantitative", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-31b44f5d4866c63b" ], "supportNote": "ITV News West Country reported the council's first-year figures as more than £31 million taken, of which £4.8 million went on operation costs, leaving a £26.4 million surplus in the zone's first year.", "caveat": "Council figures reported by a broadcaster, not audited independently. The page was read through a summarising fetch rather than a raw download, so the locator should be re-checked against the live page. No published revenue forecast was found to compare the outturn against.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-2e3c05aa615a71a8", "field": "lesson", "text": "the charge is set by the vehicle's Euro class, not by any reading, and no measured threshold moves it", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-efb0b9ae9b251edd", "src-1a5516d880c4593e" ], "supportNote": "The council's status report states 'The CAZ charges older vehicles based on the vehicle Euro category classification.' The published charge table gives one flat daily rate per vehicle category and no variation of any kind; neither the council's scheme pages nor the Direction provide for a rate that changes with measured air quality.", "caveat": "The second half is an absence: no source consulted describes an air-quality-triggered variation, which is weaker evidence than a source stating there is none.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-adef2430c060676b", "field": "lesson", "text": "a Direction it may not vary, revoke or suspend without the written consent of the Secretary of State", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-bfc46f6d725e81e9" ], "supportNote": "Article 5 of the Direction provides that 'The authority must not vary, revoke or suspend its implementation of the local plan for NO2 compliance pursuant to Article 4, without the prior written consent of the Secretary of State.'", "caveat": null, "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } }, { "id": "clm-d0c4ee07a831322b", "field": "lesson", "text": "to work out why two streets stayed above the limit, the council apportioned NOx by vehicle type from a week of anonymised number plate data", "statementKind": "descriptive", "textMode": "verbatim-from-project-record", "mappingStatus": "mapped", "sourceRefs": [ "src-efb0b9ae9b251edd" ], "supportNote": "Appendix C of the status report states that in 2024 'work continued to better understand why compliance has not been achieved in some limited locations. As part of this work, a source apportionment exercise was carried out for Bond Street and Colston Avenue. This used anonymised automatic number plate recognition data from a seven-day period of Q4 of 2023 to determine the percentage of NOx emissions from different vehicle types'.", "caveat": "The report says outputs were used to identify options for further investigation and that the work is ongoing; it does not report a measure adopted as a result.", "interpretation": { "added": false, "interpolation": false, "note": "The passport copies the published claim and its recorded source mapping without adding a conclusion." } } ], "sources": [ { "id": "src-b6d1b4390e951ee6", "title": "GOV.UK — Driving in a clean air zone (authority)", "url": "https://www.gov.uk/guidance/driving-in-a-clean-air-zone", "publisher": { "name": null, "domain": "gov.uk", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-f3a0cb386db0ff2f", "clm-ff098ea2dfd89943", "clm-f7603117e6eda141", "clm-7e836fa729f15980" ], "temporal": { "publishedAt": "2020-01-28", "updatedAt": "2026-02-12", "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-25", "dossierCreatedAt": "2026-08-25", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "The national list of England's Clean Air Zones. Gives Bristol as Class D covering 1.18 square miles, defines Class D as the only class whose charges reach cars, and its change history dates the start of charging to 28 November 2022. It states that London's low and ultra low emission zones are a separate regime run by the Mayor.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-1a5516d880c4593e", "title": "Bristol City Council — Pay the Clean Air Zone daily charge (authority)", "url": "https://www.bristol.gov.uk/residents/streets-travel/bristols-caz/pay-the-bristol-clean-air-zone-daily-charge", "publisher": { "name": null, "domain": "bristol.gov.uk", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-0a2cbff532aebde3", "clm-f7603117e6eda141", "clm-2e3c05aa615a71a8" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-25", "dossierCreatedAt": "2026-08-25", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The operator's charge schedule: £9 for private petrol cars, private diesel cars, taxis and light goods vehicles under 3.5t; £100 for heavy goods vehicles over 3.5t, buses and coaches. It also carries the operating hours and the six-day payment window. A single flat rate per vehicle category, with no variation by measured air quality.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-688a5c6fb10e6dfa", "title": "Bristol City Council — What are Clean Air Zone Exemptions (authority)", "url": "https://www.bristol.gov.uk/residents/streets-travel/bristols-caz/exemptions/what-are-clean-air-zone-exemptions", "publisher": { "name": null, "domain": "bristol.gov.uk", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-48728df008e1385e" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-25", "dossierCreatedAt": "2026-08-25", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The operator's exemptions page, and the council page that states plainly how the zone is enforced: cameras with automatic number plate recognition, which also recognise exempt vehicles automatically.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-bfc46f6d725e81e9", "title": "Environment Act 1995 (Bristol City Council) Air Quality Direction 2021 (Defra)", "url": "https://assets.publishing.service.gov.uk/media/6183c2bbe90e071983346591/Environment_Act_1995__Bristol_City_Council__Air_Quality_Direction_2021.pdf", "publisher": { "name": null, "domain": "assets.publishing.service.gov.uk", "classification": "not-classified" }, "sourceType": "pdf", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-99b8af652e468798", "clm-b464de7a95538d85", "clm-adef2430c060676b" ], "temporal": { "publishedAt": "2021-11-01", "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-25", "dossierCreatedAt": "2026-08-25", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "The statutory instruction behind the zone, made by the Parliamentary Under Secretary of State at Defra under section 85(5) of the Environment Act 1995. Schedule 1 names the measure as a \"Charging Clean Air Zone Class D\"; article 4(2) requires compliance \"in the shortest possible time, and by 2023 at the latest\"; article 5 forbids the council from varying, revoking or suspending it without the Secretary of State's prior written consent. It revokes an earlier 2020 direction to the same council.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-efb0b9ae9b251edd", "title": "Bristol City Council — 2025 Air Quality Annual Status Report (authority)", "url": "https://www.bristol.gov.uk/files/documents/10157-bristol-city-council-asr-2025/file", "publisher": { "name": null, "domain": "bristol.gov.uk", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-7e836fa729f15980", "clm-99b8af652e468798", "clm-b2e54d2a9ecc6670", "clm-3d0dad9fca3b75a3", "clm-7ca4780c86be7539", "clm-d70b4e120d7d5059", "clm-2e3c05aa615a71a8", "clm-d0c4ee07a831322b" ], "temporal": { "publishedAt": null, "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-25", "dossierCreatedAt": "2026-08-25", "retrievedAt": null, "status": "record-date-only" }, "locator": { "type": "descriptive-source-note", "value": "The council's statutory Local Air Quality Management report, covering 2024 monitoring data. Source of the 13.2% and 4.7% average NO2 falls, the count of five sites still above the objective in 2024, the progress-table entry \"Compliance not yet achieved\", the statement that the CAZ charges on Euro class, and the Appendix C description of the ANPR-based source apportionment at Bond Street and Colston Avenue.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-0801319cffcea9e9", "title": "National Audit Office — Tackling local breaches of air quality (independent audit)", "url": "https://www.nao.org.uk/reports/tackling-local-breaches-of-air-quality/", "publisher": { "name": null, "domain": "nao.org.uk", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "background", "claimRefs": [], "temporal": { "publishedAt": "2022-06-17", "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-25", "dossierCreatedAt": "2026-08-25", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "Audit of the national NO2 Programme that Bristol sits inside (HC 66, Session 2022-23), published five months before the zone opened. It records that government expected in 2017 that measures would take three years or less with all measures outside London implemented by 2021, and that as at 1 April 2022 the 17 authorities still implementing had been in the programme for 4.5 years on average. It lists Bristol Urban Area among the zones breaching the NO2 annual limit in 2020.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } }, { "id": "src-31b44f5d4866c63b", "title": "ITV News West Country — Clean Air Zone first-year revenue (press)", "url": "https://www.itv.com/news/westcountry/2024-01-17/clean-air-zone-makes-more-than-26-million-in-first-year", "publisher": { "name": null, "domain": "itv.com", "classification": "not-classified" }, "sourceType": "web-page", "language": "und", "role": "claim-evidence", "claimRefs": [ "clm-f5882bdac739ebd8" ], "temporal": { "publishedAt": "2024-01-17", "updatedAt": null, "sourceCheckedAt": null, "recordLastVerifiedAt": "2026-08-25", "dossierCreatedAt": "2026-08-25", "retrievedAt": null, "status": "publication-and-record-dates-recorded" }, "locator": { "type": "descriptive-source-note", "value": "Regional broadcast report on the council's first-year figures: more than £31 million taken, £4.8 million of it spent on operating costs, leaving £26.4 million. No independent audit of these figures was found.", "exact": false }, "preservation": { "archiveUrl": null, "archivedAt": null, "contentHash": null, "status": "not-captured" } } ], "coverage": { "claimsTotal": 16, "claimsMapped": 16, "sourcesTotal": 7, "sourcesUsedByClaims": 6, "sourcesWithPublicationDate": 4, "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." ] } } ] }