{
  "url": "https://openlegislation.uk/air-quality-wales-regulations-2000/schedule/paragraph-2",
  "json_url": "https://openlegislation.uk/air-quality-wales-regulations-2000/schedule/paragraph-2.json",
  "legislation": "wsi/2000/1940",
  "legislation_title": "The Air Quality (Wales) Regulations 2000",
  "legislation_url": "https://openlegislation.uk/air-quality-wales-regulations-2000",
  "path": "schedule/paragraph/2",
  "kind": "paragraph",
  "number": "2",
  "heading": null,
  "text": "(1) A maximum daily running 8 hour mean is calculated on a daily basis. The maximum daily running 8 hour mean for a particular substance at a particular location for a particular day is the maximum of the running 8 hour means ending during that day.\n(2) For the purpose of sub-paragraph (1), a “running 8 hour mean” is a mean which is calculated on an hourly basis, yielding one running 8 hour mean per hour. The running 8 hour mean for the relevant substance at the relevant location for a particular hour is the mean of the hourly means for the substance at the location for that hour and the preceding 7 hours.",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Sch. Pt. 2 para. 2 substituted (31.12.2002) by The Air Quality (Amendment) (Wales) Regulations 2002 (S.I. 2002/3182), regs. 1(1), 2(3)(a)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2000/1940/schedule/paragraph/2",
    "retrieved_at": "2026-10-29T00:18:33.450536+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."
}