{
  "url": "https://openlegislation.uk/draft-air-quality-england-regulations-2000/schedule/paragraph-2",
  "json_url": "https://openlegislation.uk/draft-air-quality-england-regulations-2000/schedule/paragraph-2.json",
  "legislation": "ukdsi/2000/0110987640",
  "legislation_title": "The Air Quality (England) Regulations 2000",
  "legislation_url": "https://openlegislation.uk/draft-air-quality-england-regulations-2000",
  "path": "schedule/paragraph/2",
  "kind": "paragraph",
  "number": "2",
  "heading": "Interpretation",
  "text": "(1) A running annual mean is a mean which is calculated on an hourly basis, yielding one running annual mean per hour. The running annual mean for a particular substance at a particular location for a particular hour is the mean of the hourly levels for that substance at that location for that hour and the preceding 8759 hours.\n(2) For the purpose of the calculation of a running annual mean, the hourly level for a particular substance at a particular location is either:\n(a) the level at which that substance is recorded as being present in the air at that location during the hour on the basis of a continuous sample of air taken during that hour for at least 30 minutes; or\n(b) the mean of the levels recorded at that location on the basis of 2 or more samples of air taken during the hour for an aggregate period of at least 30 minutes.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ukdsi/2000/0110987640/schedule/paragraph/2",
    "retrieved_at": "2026-10-30T15:19:07.588390+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."
}