{
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  "scaling": "zero=0; positive county indicators ranked among positive values; missing remains null",
  "weight_rationale": "Conservative screening choice; not empirically calibrated to health outcomes. 5% preserves rankings more than tested 10%/15%.",
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      "ingestion_date": "2026-08-09",
      "source_publication_date": "2024-08-01",
      "data_period_start": "2024-01-01",
      "data_period_end": "2024-12-31",
      "api_endpoint": "https://dataverse.harvard.edu/api/access/datafile/10775979",
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      "was_duplicate": false,
      "dag_id": "env_health_extract",
      "task_id": "extract_epa_ejscreen",
      "dag_run_id": "scheduled__2026-08-09T02:00:00+00:00",
      "year": 2024,
      "label": "Harvard Dataverse 2024 Tract",
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    "exact_county_matches": 3222,
    "tracts": 84530,
    "population_vs_unweighted_spearman": 0.9995968508831752
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    "candidates": {
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    "overlap": {
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      "tri_total_releases_lbs": {
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      "tri_carcinogen_releases_lbs": {
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    "population_under_50000": {
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    "population_50000_plus": {
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    "mining_examples": [
      {
        "fips": "29145",
        "raw_proximity": 14.8697,
        "old": 64.3,
        "new": 66.6
      },
      {
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  "compound_counts": {
    "0": 1519,
    "1": 978,
    "2": 598,
    "3": 122,
    "4": 5
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  "limitations": [
    "Proximity is not exposure, dose, illness or current cleanup status.",
    "EPA 2024 uses 10km distances to listed/proposed NPL and SAA boundaries. Deleted/nonlisted contamination can be omitted.",
    "No independent 5km/20km geometry recomputation was possible from the archived tract indicators; tested aggregation and nonlinear scaling instead.",
    "RSEI concentration data are not yet ingested; TRI correlations do not establish causal independence.",
    "Counties with only Superfund data remain unscored. PFAS observations remain display-only."
  ]
}