{
  "url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-5/part-I/paragraph-wrapper19n1",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002/schedule-5/part-I/paragraph-wrapper19n1.json",
  "legislation": "wsi/2002/3183",
  "legislation_title": "The Air Quality Limit Values (Wales) Regulations 2002",
  "legislation_url": "https://openlegislation.uk/air-quality-limit-values-wales-regulations-2002",
  "path": "schedule/5/part/I/paragraph/wrapper19n1",
  "kind": "paragraph",
  "number": null,
  "heading": null,
  "text": "The following data quality objectives, for allowed uncertainty of assessment methods, and of minimum time coverage and of data capture of measurement are provided to guide quality assurance programmes.\nBenzene\nCarbon monoxide\nFixed measurements\nUncertainty\n25%\n15%\nMinimum data capture\n90%\n90%\nMinimum time coverage\n35% urban background and traffic sites (distributed over the year to be representative of various conditions for climate and traffic) 90% industrial sites\nIndicative measurements\nUncertainty\n30%\n25%\nMinimum data capture\n90%\n90%\nMinimum time coverage\n14% (one day’s measurement a week at random, evenly distributed over the year, or 8 weeks evenly distributed over the year)\n14% (one measurement a week at random, evenly distributed over the year, or 8 weeks evenly distributed over the year)\nModelling\nUncertainty:\nEight-hour averages\n50%\nAnnual averages\n50%\nObjective estimation\nUncertainty\n100%\n75%",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2002/3183/schedule/5/part/I/paragraph/wrapper19n1",
    "retrieved_at": "2026-10-29T00:12:37.924889+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."
}