{
  "url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2001/schedule-6/part-IV",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2001/schedule-6/part-IV.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/6/part/IV",
  "kind": "part",
  "number": "IV",
  "heading": "Reference method for the sampling and measurement of PM10",
  "text": "The reference method for the sampling and measurement of PM10 will be that described in EN 12341 “Air Quality – Field Test Procedure to Demonstrate Reference Equivalence of Sampling Methods for the PM10 fraction of particulate matter”. The measurement principle is based on the collection on a filter of the PM10 fraction of ambient particulate matter and the gravimetric mass determination.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "European Standards Institute “CEN” publication reference BSEN 12341, obtainable from the British Standards Institute “BSI” as for footnote (a) above."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2001/2683/schedule/6/part/IV",
    "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."
}