{
  "url": "https://openlegislation.uk/eu-directive-2008-50/annex-XI/division-A",
  "json_url": "https://openlegislation.uk/eu-directive-2008-50/annex-XI/division-A.json",
  "legislation": "eudr/2008/50",
  "legislation_title": "Directive 2008/50/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe",
  "legislation_url": "https://openlegislation.uk/eu-directive-2008-50",
  "path": "annex/XI/division/A",
  "kind": "division",
  "number": "A",
  "heading": "Criteria",
  "text": "Without prejudice to Annex I, the following criteria shall be used for checking validity when aggregating data and calculating statistical parameters:\nThe requirements for the calculation of annual mean do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation.\nParameter\nRequired proportion of valid data\nOne hour values\n75 % (i.e. 45 minutes)\nEight hours values\n75 % of values (i.e. 6 hours)\nMaximum daily 8-hour mean\n75 % of the hourly running eight hour averages (i.e. 18 eight hour averages per day)\n24-hour values\n75 % of the hourly averages (i.e. at least 18 hour values)\nAnnual mean\n90 % of the one hour values or (if not available) 24-hour values over the year",
  "extent": "E+W+S+N.I.",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "footnote",
      "label": "f1",
      "text": "The requirements for the calculation of annual mean do not include losses of data due to the regular calibration or the normal maintenance of the instrumentation."
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/eudr/2008/50/annex/XI/division/A",
    "retrieved_at": "2026-11-01T15:22:21.245568+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."
}