{
  "url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-6/part-3",
  "json_url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-6/part-3.json",
  "legislation": "wsi/2007/717",
  "legislation_title": "The Air Quality Standards (Wales) Regulations 2007",
  "legislation_url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007",
  "path": "schedule/6/part/3",
  "kind": "part",
  "number": "3",
  "heading": "Group B pollutants",
  "text": "Population of zone (thousands)\nIf maximum concentrations exceed the upper assessment threshold\nIf maximum concentrations are between the upper and lower assessment thresholds\nArsenic, Cadmium, Nickel\nBenzo(a) pyrene\nArsenic, Cadmium, Nickel\nBenzo(a)pyrene\n(1) To include at least one urban-background station and for benzo(a)pyrene also one traffic-oriented station provided this does not increase the number of sampling points.\n0—749\n1\n1\n1\n1\n750—1,999\n2\n2\n1\n1\n2,000—3,749\n2\n3\n1\n1\n3,750—4,749\n3\n4\n2\n2\n4,750—5,999\n4\n5\n2\n2\n=<6,000\n5\n5\n2\n2",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "(1) To include at least one urban-background station and for benzo(a)pyrene also one traffic-oriented station provided this does not increase the number of sampling points."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2007/717/schedule/6/part/3",
    "retrieved_at": "2026-10-29T00:01:33.213395+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."
}