{
  "alt": "Dot plot with intervals, one row per decile of diesel exposure from the least to the most, and a rule at an even split. The dots rise from {fact:margin_d1} points in the first decile, a Republican lead, to {fact:margin_d10} points in the tenth, a Democratic lead, and the fifth decile sits at {fact:margin_d5} points, close to an even split.",
  "caption": "The margin rises with each step from the tenth of tracts with the least diesel exposure to the tenth with the most, and the interval of the fifth decile includes zero. Dots are vote-weighted mean margins and whiskers are 95% intervals that allow tracts in one county to resemble each other.",
  "data": [
    {
      "conf_high": -27.4156,
      "conf_low": -32.2333,
      "decile": 1,
      "decile_label": "1 (0.04 µg/m³)",
      "diesel_median": 0.0416557,
      "margin": -29.8245,
      "n": 8114
    },
    {
      "conf_high": -26.2367,
      "conf_low": -31.3134,
      "decile": 2,
      "decile_label": "2 (0.07)",
      "diesel_median": 0.0680021,
      "margin": -28.7751,
      "n": 8113
    },
    {
      "conf_high": -19.3885,
      "conf_low": -24.1795,
      "decile": 3,
      "decile_label": "3 (0.09)",
      "diesel_median": 0.092188,
      "margin": -21.784,
      "n": 8113
    },
    {
      "conf_high": -7.47991,
      "conf_low": -13.2458,
      "decile": 4,
      "decile_label": "4 (0.12)",
      "diesel_median": 0.118008,
      "margin": -10.3629,
      "n": 8114
    },
    {
      "conf_high": 4.67811,
      "conf_low": -1.83105,
      "decile": 5,
      "decile_label": "5 (0.14)",
      "diesel_median": 0.143817,
      "margin": 1.42353,
      "n": 8113
    },
    {
      "conf_high": 12.4517,
      "conf_low": 6.15303,
      "decile": 6,
      "decile_label": "6 (0.17)",
      "diesel_median": 0.171017,
      "margin": 9.30238,
      "n": 8113
    },
    {
      "conf_high": 21.7324,
      "conf_low": 14.9941,
      "decile": 7,
      "decile_label": "7 (0.20)",
      "diesel_median": 0.203176,
      "margin": 18.3632,
      "n": 8114
    },
    {
      "conf_high": 30.0673,
      "conf_low": 22.6189,
      "decile": 8,
      "decile_label": "8 (0.24)",
      "diesel_median": 0.244072,
      "margin": 26.3431,
      "n": 8113
    },
    {
      "conf_high": 40.1111,
      "conf_low": 28.2441,
      "decile": 9,
      "decile_label": "9 (0.31)",
      "diesel_median": 0.311086,
      "margin": 34.1776,
      "n": 8113
    },
    {
      "conf_high": 55.8447,
      "conf_low": 42.3929,
      "decile": 10,
      "decile_label": "10 (0.48)",
      "diesel_median": 0.476636,
      "margin": 49.1188,
      "n": 8114
    }
  ],
  "id": "margin_by_diesel_decile",
  "notes": [
    "Deciles of diesel exposure hold equal numbers of tracts; ties are broken by census tract code.",
    "Tracts with {fact:vote_floor} or fewer votes are left out. Intervals treat counties as the units that vary. They do not include error in the allocation of precinct votes to tracts or in the modeled pollution values."
  ],
  "source": "Precinct votes allocated to census tracts (Fekrazad 2025), 2020 presidential election; EPA EJScreen version 2.3 (2024 release, 2020 air data); American Community Survey tract data (vintage not recorded in the atlas); vote-weighted, full counts of tracts, no sampling weights",
  "spec": {
    "hi": "conf_high",
    "lo": "conf_low",
    "n": "n",
    "reference": 0,
    "referenceLabel": "Even split",
    "sort": "data",
    "x": "margin",
    "xDomain": [
      -45,
      65
    ],
    "xFormat": {
      "digits": 0,
      "signed": true
    },
    "xLabel": "Democratic margin, points (below 0 = Republican lead)",
    "y": "decile_label"
  },
  "subtitle": "Democratic minus Republican share of the two-party 2020 presidential vote, percentage points; vote-weighted mean by decile of tract diesel particulate exposure, each row labeled with the decile and its median exposure in micrograms per cubic meter; 95% intervals clustered by county",
  "title": "The Democratic margin rises from {fact:margin_d1} points in the tenth of tracts with the least diesel exposure to {fact:margin_d10} points in the tenth with the most",
  "type": "dot",
  "width": "wide"
}