{
  "url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-1/paragraph-3",
  "json_url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-1/paragraph-3.json",
  "legislation": "wsi/2007/717",
  "legislation_title": "The Air Quality Standards (Wales) Regulations 2007",
  "legislation_url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007",
  "path": "schedule/1/paragraph/3",
  "kind": "paragraph",
  "number": "3",
  "heading": null,
  "text": "In this Part—\n(a) all values must be expressed in μg/m3;\n(b) the volume must be standardised at the following conditions of temperature and pressure: 293K and 101.3kPa;\n(c) the time must be specified in Central European Time;\n(d) “AOT40” (expressed in (μg/m3) hours) means the sum of the difference between hourly concentrations greater than 80 μg/m3 (which equals 40 parts per billion) and 80 μg/m3 over a given period using only the 1 hour values measured between 8:00 and 20:00 Central European Time each day; and\n(e) in order to be valid, the annual data on exceedances used to check compliance with the target values and long-term objectives below must meet the criteria set out in Part 2 of Schedule 12.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2007/717/schedule/1/paragraph/3",
    "retrieved_at": "2026-10-29T00:01:33.213395+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."
}