{
  "url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-1/part-I/paragraph-1n1",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-1/part-I/paragraph-1n1.json",
  "legislation": "wsi/2002/3183",
  "legislation_title": "The Air Quality Limit Values (Wales) Regulations 2002",
  "legislation_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002",
  "path": "schedule/1/part/I/paragraph/1n1",
  "kind": "paragraph",
  "number": "1.1",
  "heading": "Limit values for sulphur dioxide",
  "text": "Averaging period\nLimit value\nMargin of tolerance\nDate by which limit value is to be met\n1.Hourly limit value for the protection of human health\n1 hour\n350μg/m3, not to be exceeded more than 24 times a calendar year\n60μg/m3 on 1st January 2003, reducing on 1st January of each following year by equal annual amounts to reach 0μg/m3 by 1st January 2005\n1st January 2005\n2.Daily limit value for the protection of human health\n24 hours\n125μg/m3, not to be exceeded more than 3 times a calendar year\nNone\n1st January 2005\n3.Limit value for the protection of ecosystems\nCalendar year and winter (1st October to 31st March)\n20μg/m3\nNone",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "M",
      "label": "M1",
      "text": "The figures for Margins of Tolerance for each of the relevant pollutants given in this Schedule are calculated from those given in Annex I of Directive 99/30/EC and Annexes I and II of Directive 2000/69/EC."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2002/3183/schedule/1/part/I/paragraph/1n1",
    "retrieved_at": "2026-10-29T00:12:37.924889+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."
}