{
  "url": "https://openlegislation.uk/air-quality-limit-values-regulations-2001/schedule-2/part-II",
  "json_url": "https://openlegislation.uk/air-quality-limit-values-regulations-2001/schedule-2/part-II.json",
  "legislation": "uksi/2001/2315",
  "legislation_title": "The Air Quality Limit Values Regulations 2001",
  "legislation_url": "https://openlegislation.uk/air-quality-limit-values-regulations-2001",
  "path": "schedule/2/part/II",
  "kind": "part",
  "number": "II",
  "heading": "Determination of exceedances of upper and lower assessment thresholds",
  "text": "Exceedances of upper and lower assessment thresholds must be determined on the basis of concentrations during the previous five years where sufficient data are available. An assessment threshold will be deemed to have been exceeded if during those five years the total number of exceedances of the numerical concentration of the threshold is more than three times the number of exceedances allowed each year.\nWhere fewer than five years' data are available, measurement campaigns of short duration during the period of the year and at locations likely to be typical of the highest pollution levels may be combined with results obtained from emisson inventories and modelling to determine exceedances of the upper and lower assessment thresholds.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [
    {
      "type": "words substituted",
      "affecting": "uksi/2002/3117",
      "affecting_title": "The Air Quality Limit Values (Amendment) Regulations 2002"
    }
  ],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2001/2315/schedule/2/part/II",
    "retrieved_at": "2026-10-29T07:45:21.655109+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."
}