{
  "url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-4",
  "json_url": "https://openlegislation.uk/air-quality-ozone-wales-regulations-2003/schedule-4.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/4",
  "kind": "schedule",
  "number": "4",
  "heading": "MEASUREMENTS OF OZONE PRECURSOR SUBSTANCES",
  "text": "The main objectives of measurements of ozone precursor substances are to analyse any trend in ozone precursors, to check the efficiency of emission reduction strategies, to check the consistency of emissions inventories and to help attribute emission sources to pollution concentration.\nAn additional aim is to support the understanding of ozone formation and precursor dispersion processes, as well as the application of photochemical models.",
  "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/4",
    "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."
}