{
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    "label": "Road-weighted NO2",
    "phase": "E4",
    "family": "Air quality",
    "unit": "\u00b5g/m\u00b3",
    "definition": "Sum road metres \u00d7 annual assessed NO2 concentration / covered road metres",
    "denominatorDefinition": "Covered mapped road metres",
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    "denominator": [],
    "source": "Defra 2025 assessed annual 1 km concentrations",
    "sourceUrl": "https://www.gov.uk/government/publications/air-quality-compliance-assessment-2025-modelled-data-and-reports",
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    "status": "provisional",
    "readiness": "provisional modelled environmental context",
    "measurementType": "Assessed 1 km ambient model estimate",
    "role": "candidate",
    "zeroBand": false,
    "overlapGroup": "Air quality",
    "sourceVersion": "ew-v3",
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    "sourceGeography": "1 km OSGB grid to LSOA2021 roads",
    "geographicResolution": "LSOA2021 aggregate; source resolution retained in audit",
    "applicability": "Every one of the 35,672 master LSOAs retained. Coverage gates are feature-specific; source gaps are not zero.",
    "comparability": "Common source and definition across England and Wales; feature-specific coverage and vintage limitations retained",
    "retrospectiveResearchAvailable": true,
    "historicalForecastEligibility": "Retrospective source editions and bands frozen on 2026-10-12. No certified historical as-of score. Use only sources and bands known at a future forecast origin.",
    "historicalAsOf2022Eligible": false,
    "availableFrom": "2026-10-09",
    "frozenBandsAvailableFrom": "2026-10-12",
    "mileageAllocationUse": "Not used in the existing regional mileage pilot. Nationwide exposure dependence still requires audit.",
    "exposureSensitivityRequired": true,
    "licence": "Open Government Licence v3.0; source-specific attribution in audits.",
    "sourceStatus": "Frozen source-derived aggregate",
    "releasedAt": "2026-10-09",
    "extractedAt": "2026-10-12",
    "revision": "Pinned source edition; retrieved 2026-10-12, see source audit",
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