{
  "url": "https://openlegislation.uk/air-quality-regulations-northern-ireland-2003/schedule",
  "json_url": "https://openlegislation.uk/air-quality-regulations-northern-ireland-2003/schedule.json",
  "legislation": "nisr/2003/342",
  "legislation_title": "Air Quality Regulations (Northern Ireland) 2003",
  "legislation_url": "https://openlegislation.uk/air-quality-regulations-northern-ireland-2003",
  "path": "schedule",
  "kind": "schedule",
  "number": null,
  "heading": "Air Quality Objectives",
  "text": "Pollutant\nAir Quality objective levels\nDate to be achieved by\n(1)\n(2)\n(3)\n*μg/m3: micrograms per cubic metre\nppb/ppm: parts per billion/million\nmg/m3: milligrams per cubic metre\nBenzene\n16.25μg/m3 (5ppb) when expressed as a running annual mean\n31 December 2003\n3.25μg/m3 when expressed as a running annual mean\n31 December 2010\n1,3-butadiene\n2.25μg/m3 (1ppb) when expressed as a running annual mean\n31 December 2003\nCarbon monoxide\n10mg/m3 (8.6ppm) when expressed as a maximum daily running 8 hour mean\n31 December 2003\nLead\n0.5μg/m3 when expressed as an annual mean\n31 December 2004\n0.25mg/m3 when expressed as an annual mean\n31 December 2008\nNitrogen dioxide\n200μg/m3 (105ppb) when expressed as a 1 hour mean, not to be exceeded more than 18 times a year\n31 December 2005\n40μg/m3 (21ppb) when expressed as an annual mean\n31 December 2005\nSulphur dioxide\n350μg/m3 (132ppb) when expressed as a 1 hour mean, not to be exceeded more than 24 times a year\n31 December 2004\n125μg/m3 (47ppb) when expressed as a 24 hour mean, not to be exceeded more than 3 times a year\n31 December 2004\n266μg/m3 (100ppb) when expressed as a 15 minute mean, not to be exceeded more than 35 times a year\n31 December 2005\nParticles (PM10)\n50μg/m3 when expressed as a 24 hour mean, not to be exceeded more than 35 times a year\n31 December 2004\n40μg/m3 when expressed as an annual mean\n31 December 2004",
  "extent": "N.I.",
  "status": "prospective",
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "words in Sch. substituted (1.1.2004) by Air Quality (Amendment) Regulations (Northern Ireland) 2003 (S.R. 2003/543), regs. 1, 2"
    },
    {
      "type": "footnote",
      "label": "f1",
      "text": "*μg/m3: micrograms per cubic metreppb/ppm: parts per billion/millionmg/m3: milligrams per cubic metre"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/nisr/2003/342/schedule",
    "retrieved_at": "2026-10-29T02:01:59.124191+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."
}