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  "as_of_meaning": "Last complete source check recorded in the research snapshot; not a common observation period or a new editorial review. A separately validated source may have a later retrieved_at date; inspect each observation.",
  "dates": {
    "source_checked_at": "2026-10-27",
    "last_complete_source_check_at": "2026-10-27",
    "latest_observation_retrieved_at": "2026-10-27",
    "observations_changed_at": "2026-10-21",
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    "editorial_review_latest": "2026-10-27",
    "urban_context_retrieved_at": "2026-10-26",
    "index_evidence_evaluated_at": "2026-10-27",
    "air_quality_retrieved_at": "2026-10-26",
    "geography_candidates_evaluated_at": "2026-10-26",
    "protocols_prepared_at": "2026-10-26",
    "scoring_geographies_reviewed_at": "2026-10-26",
    "pm25_evidence_reviewed_at": "2026-10-26",
    "heat_evidence_reviewed_at": "2026-10-26",
    "rental_vacancy_evidence_reviewed_at": "2026-10-26",
    "housing_supply_evidence_reviewed_at": "2026-10-26",
    "life_expectancy_evidence_reviewed_at": "2026-10-26",
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    "initiative": "AINT.app",
    "url": "https://aint.app"
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  "rights": "No new licence is granted by this API. BestCityToLive editorial material retains its existing rights. Third-party observations and sources retain their own licences and attribution requirements; consult each primary publisher before reuse. Source catalog links do not imply permission to reproduce full source content.",
  "kind": "reviewed-heat-exposure",
  "id": "heat-exposure",
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      "attribution": {
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        "licence_url": "https://creativecommons.org/licenses/by/4.0/",
        "basis": "Pinned official frontend chart/CSV export metadata; the JSON response itself omits licence and units.",
        "attribution": "Contains modified Copernicus Climate Change Service (C3S) information 2025, implemented by ECMWF. Source: ERA5-HEAT via Thermal Trace and the Climate Data Store, DOI 10.24381/cds.553b7518; chart facts licensed CC BY 4.0.",
        "modifications": "Modified by BestCityToLive / AINT.app: daily maxima counted >=38 degrees Celsius on exact exported daily operands, native 0.25-degree sampling with the disclosed higher-coordinate tie rule, GHS-POP 2020 population weighting on reviewed estimated-FUA 2015 masks, and annual/monthly calculations with strict-threshold definition sensitivity. These derivatives are not source-produced city estimates.",
        "responsibility_notice": "Neither the European Commission nor ECMWF is responsible for any use that may be made of the Copernicus information or data in this publication.",
        "no_endorsement": "The original publishers have not endorsed BestCityToLive, AINT.app, Civometra, the historical estimated-area compatibility review, or these derived city-area values."
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        {
          "publisher": "Copernicus Climate Change Service (C3S), implemented by ECMWF",
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        {
          "publisher": "European Commission Joint Research Centre",
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        },
        {
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          "title": "GHS-POP R2023A V1-0, 2020 modelled residential population counts",
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        },
        {
          "publisher": "European Commission Joint Research Centre",
          "title": "GHS-POP R2023A V1-0, 2020 modelled residential population counts",
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        {
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        {
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