{
  "url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-1/part-VI/paragraph-wrapper2n1",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-1/part-VI/paragraph-wrapper2n1.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/VI/paragraph/wrapper2n1",
  "kind": "paragraph",
  "number": null,
  "heading": null,
  "text": "The maximum daily 8-hour mean concentration shall be selected by examining 8-hour running averages, calculated from hourly data and updated each hour. Each 8-hour average so calculated shall be assigned to the day on which it ends, i.e. the first calculation period for any one day shall be the period from 17:00 on the previous day to 01:00 on that day; the last calculation period for any one day shall be the period from 16:00 to 24:00 on that day.",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2002/3183/schedule/1/part/VI/paragraph/wrapper2n1",
    "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."
}