{ "feature": "air_pm25", "metadata": { "id": "air_pm25", "label": "Road-weighted PM2.5", "phase": "E4", "family": "Air quality", "unit": "\u00b5g/m\u00b3", "definition": "Sum road metres \u00d7 annual assessed PM2.5 concentration / covered road metres", "denominatorDefinition": "Covered mapped road metres", "numerator": [], "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", "observationPeriod": "2025; 2022\u20132024 sensitivity files separate", "note": "Road-weighted assessed annual ambient concentrations, \u226599% mapped-road coverage; April 2026 OS geometry. 2025 CMAQ-Urban replaces PCM, so years are not pooled into one trend. These are model estimates, not individual or roadside-monitor exposure.", "status": "provisional", "readiness": "provisional modelled environmental context", "measurementType": "Assessed 1 km ambient model estimate", "role": "candidate", "zeroBand": false, "overlapGroup": "Air quality", "sourceVersion": "ew-v3", "direction": "Higher band = higher feature value; no tested collision-risk direction", "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", "sourceChecksums": [ { "file": "inputs/air-lsoa-values.csv.gz", "sha256": "7fd41ac511ebf1add580eceb3a3ad7029ffcf144c78ada71da70de71aa668f21" }, { "file": "inputs/air-lsoa-years.csv.gz", "sha256": "abacb4fb7312ec50655cd903ea6315183846280d5a8184654ffcc17ec531bcaf" }, { "file": "inputs/air-no2-2022-grid.csv.gz", "sha256": "1b3d46ff5feec3f88eb340cc9a496fa75c605dd8d3c12a16ba39140398a8f78f" }, { "file": "inputs/air-no2-2023-grid.csv.gz", "sha256": "0a82cfe2ed400014f8e017a276120dd694812dd18e5a5491c036773fab7b11f1" }, { "file": "inputs/air-no2-2024-grid.csv.gz", "sha256": "e46bddc5c6a98ccf310b257999a1484013c8790a9ab29e09b741e2d1be902c97" }, 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