{
  "url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-3/part-I",
  "json_url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-3/part-I.json",
  "legislation": "wsi/2003/1848",
  "legislation_title": "The Air Quality (Ozone) (Wales) Regulations 2003",
  "legislation_url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003",
  "path": "schedule/3/part/I",
  "kind": "part",
  "number": "I",
  "heading": null,
  "text": "Minimum number of sampling points for fixed continuous measurement to assess air quality in view of compliance with the target values, long-term objectives and information and alert thresholds where continuous measurement is the sole source of information\nPopulation (x 1,000)\nAgglomerations (urban and suburban)\nOther zones (suburban and rural)\nRural background\n(a)at least 1 station in suburban areas, where the highest exposure of the population is likely to occur. In agglomerations, at least 50% of the stations should be located in suburban areas.\n(b)1 station per 25,000 km2 for complex terrain is recommended.\n0 — 250\n1\n1 station/50,000 km2 as an average density over all zones per country\n251 — 500\n1\n2\n501 — 1,000\n2\n2\n1,001 — 1,500\n3\n3\n1,501 — 2,000\n3\n4\n2,001 — 2,750\n4\n5\n2,751 — 3,750\n5\n6\n> 3,750\n1 additional station per 2 million inhabitants\n1 additional station per 2 million inhabitants",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "(a)at least 1 station in suburban areas, where the highest exposure of the population is likely to occur. In agglomerations, at least 50% of the stations should be located in suburban areas."
    },
    {
      "type": "footnote",
      "label": "f2",
      "text": "(b)1 station per 25,000 km2 for complex terrain is recommended."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2003/1848/schedule/3/part/I",
    "retrieved_at": "2026-10-29T00:10:44.777755+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}