{
  "url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2001/schedule-1/paragraph-2.1",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2001/schedule-1/paragraph-2.1.json",
  "legislation": "wsi/2001/2683",
  "legislation_title": "The Air Quality Limit Values (Wales) Regulations 2001",
  "legislation_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2001",
  "path": "schedule/1/paragraph/2.1",
  "kind": "paragraph",
  "number": "2.1",
  "heading": "Limit values for nitrogen dioxide and oxides of nitrogen",
  "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\n200μg/m3 NO2not to be exceeded more than 18 times a calendar year\n50% on 19 July 1999, reducing on 1 January 2001 and every 12 months thereafter by equal annual percentages to reach 0% by 1 January 2010\n1 January 2010\n2 Annual limit value for the protection of human health\nCalendar year\n40 μg/m3NO2\n50% on 19 July 1999 reducing on 1 January 2001 and every 12 months thereafter by equal annual percentages to reach 0% by 1 January 2010\n1 January 2010\n3 Annual limit value for the protection of vegetation\nCalendar year\n30 μg/m3 NOx\nNone\n19 July 2001",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2001/2683/schedule/1/paragraph/2.1",
    "retrieved_at": "2026-10-29T00:15:58.976500+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."
}