{
  "advisories": [],
  "contextual_source_degraded": false,
  "earthdata_stage": "metadata_only",
  "failures": [],
  "fallback_reason": "UK-AIR current-particle collection unavailable; quality-validated LAQN continuity used",
  "fallback_used": true,
  "firms_record_count": 475,
  "firms_stage": "records_downloaded",
  "measurement_count_definitions": {
    "analysis_window_valid_observation_count": "Quality-accepted numeric observations inside the exact AQ26 analysis window.",
    "physical_site_count": "Deduplicated physical monitoring locations, counted independently of pollutant streams.",
    "provider_expected_slot_count": "Provider timetable slots returned across selected series and lookback.",
    "provider_missing_slot_count": "Expected provider slots without a numeric observation.",
    "provider_numeric_observation_count": "Timestamped numeric provider observations; blank timetable slots excluded.",
    "timeseries_count": "Unique monitoring streams defined by source, station, pollutant, method, unit and averaging period."
  },
  "preferred_uk_air_completed": false,
  "primary_measurement_physical_site_count": 19,
  "primary_measurement_provider_expected_slot_count": 1944,
  "primary_measurement_provider_missing_slot_count": 1172,
  "primary_measurement_provider_numeric_observation_count": 772,
  "primary_measurement_sources_ready": 1,
  "primary_measurement_timeseries_count": 24,
  "primary_measurement_valid_observation_count": 712,
  "primary_source_id": "laqn_imperial",
  "primary_source_record_count": 772,
  "primary_source_stage": "quality_validated",
  "scientific_boundary": "A green release gate confirms harvest mechanics and validation stages only; it does not establish attribution, compliance or health impact. A valid zero-detection context query is not evidence that no fire or thermal source existed.",
  "status": "passed",
  "strict": true
}