{
  "url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-1",
  "json_url": "https://openlegislation.uk/air-quality-standards-wales-regulations-2007/schedule-8/paragraph-1.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/8/paragraph/1",
  "kind": "paragraph",
  "number": "1",
  "heading": "Group A pollutants (other than benzene and carbon monoxide) and PM2·5",
  "text": "Data-quality objectives are set out in the table and paragraphs below for the required accuracy of assessment methods, of minimum time coverage and of data capture of measurement are laid down to guide quality assurance programmes—\nSulphur dioxide, nitrogen dioxide and oxides of nitrogen\nLead, PM2·5 and PM10\nContinuous measurement\nAccuracy\n15%\n25%\nMinimum data capture\n90%\n90%\nIndicative measurement\nAccuracy\n25%\n50%\nMinimum data capture\n90%\n90%\nMinimum time coverage\n14% (one measurement a week at random, evenly distributed over the year, or eight weeks evenly distributed over the year)\n14% (one measurement a week at random, evenly distributed over the year, or eight weeks evenly distributed over the year)\nModelling\nAccuracy\nHourly averages\n50%-60%\nDaily averages\n50%\nAnnual averages\n30%\n50%\nObjective estimation\nAccuracy\n75%\n100%",
  "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/8/paragraph/1",
    "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."
}