{
  "annotation_id": "2ca5826a-9a27-40b1-9ebe-b18679bb5803",
  "date_created": "2026-03-02T18:00:57.286000Z",
  "date_modified": "2026-03-02T18:00:57.286000Z",
  "file_hash": "758ffb4fbd8e888c355a3d28cf298035dd4ee26a8c2b70fe66866354f98feeb0",
  "private": false,
  "record": {
    "abstract": "Early surface measurements of atmospheric Potential Gradient were made in\nmany European cities in the nineteenth century (C19th). The data was usually\nobtained at hourly resolution, and good accounts of the calibration of the\ninstruments are also often available. The PG measurements made by Chauveau on\nthe Eiffel Tower, soon after its completion in the 1890s, are particularly\nnotable. Atmospheric electrical proxy techniques in combination with simple\nboundary layer meteorology are used to determine air pollution levels. The\nC19th PG measurements in both polluted and clean Parisian air present a unique\nresource for European air pollution and atmospheric composition studies.",
    "arxiv_id": "physics/0501128",
    "authors": [
      "R. G. Harrison",
      "K. L. Aplin"
    ],
    "categories": [
      "physics.ao-ph",
      "physics.geo-ph",
      "physics.hist-ph"
    ],
    "title": "Nineteenth century air pollution variations in Paris inferred from   Eiffel Tower potential gradient measurements",
    "url": "https://arxiv.org/abs/physics/0501128"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8a938bf7-0b12-4033-b209-0eca44ff1919",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}