{
  "url": "https://openlegislation.uk/air-quality-regulations-northern-ireland-2003/schedule/paragraph-5",
  "json_url": "https://openlegislation.uk/air-quality-regulations-northern-ireland-2003/schedule/paragraph-5.json",
  "legislation": "nisr/2003/342",
  "legislation_title": "Air Quality Regulations (Northern Ireland) 2003",
  "legislation_url": "https://openlegislation.uk/air-quality-regulations-northern-ireland-2003",
  "path": "schedule/paragraph/5",
  "kind": "paragraph",
  "number": "5",
  "heading": "Interpretation",
  "text": "An hourly mean is a mean calculated every hour. The hourly mean for a particular substance at a particular location for a particular hour is the mean of the levels recorded for that substance at that location –\n(a) in the case of benzene, at a frequency of not less than once during the hour; and\n(b) in the case of carbon monoxide, nitrogen dioxide and sulphur dioxide, at a frequency of not less than once every 10 seconds during the hour.",
  "extent": "N.I.",
  "status": "prospective",
  "version": "current",
  "annotations": [
    {
      "type": "I",
      "label": "I1",
      "text": "Sch. para. 5 in operation at 1.9.2003, see reg. 1(1)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/2003/342/schedule/paragraph/5",
    "retrieved_at": "2026-10-29T02:01:59.124191+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."
}