{
  "url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2001/schedule-1/part-III",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2001/schedule-1/part-III.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/part/III",
  "kind": "part",
  "number": "III",
  "heading": "PARTICULATE MATTER (PM10)",
  "text": "Averaging Period\nLimit value\nMargin of tolerance\nDate by which limit value is to be met\n1 24-hour limit value for the protection of human health\n24 hours\n50μg/m3 PM10 not to be exceeded more than 35 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 205\n1 January 2005\n2 Annual limit value for the protection of human health\nCalendar year\n40 μg/m3PM10\n20% on 19 July 1999 reducing on 1 January 2001 and every 12 months thereafter by equal annual percentages to reach 0% by 1 January 2005\n1 January 2005",
  "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/part/III",
    "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."
}