{
  "url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-1/part-I",
  "json_url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-1/part-I.json",
  "legislation": "wsi/2003/1848",
  "legislation_title": "The Air Quality (Ozone) (Wales) Regulations 2003",
  "legislation_url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003",
  "path": "schedule/1/part/I",
  "kind": "part",
  "number": "I",
  "heading": "Definitions and interpretation",
  "text": "When assessing compliance with the target values and long-term objectives set out in this Schedule—\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 80μg/m3 (which equals 40 parts per billion) and 80μg/m3 over a given period using only the 1 hour values measured between 8:00 and 20:00 Central European Time each day;\n(e) in order to be valid, the annual data on exceedances must meet the criteria set out in Part II of Schedule 8.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2003/1848/schedule/1/part/I",
    "retrieved_at": "2026-10-29T00:10:44.777755+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."
}