{
  "url": "https://openlegislation.uk/air-quality-wales-regulations-2000/schedule/part-I",
  "json_url": "https://openlegislation.uk/air-quality-wales-regulations-2000/schedule/part-I.json",
  "legislation": "wsi/2000/1940",
  "legislation_title": "The Air Quality (Wales) Regulations 2000",
  "legislation_url": "https://openlegislation.uk/air-quality-wales-regulations-2000",
  "path": "schedule/part/I",
  "kind": "part",
  "number": "I",
  "heading": null,
  "text": "TABLE\nAIR QUALITY OBJECTIVES\nSubstance/ Air Quality Objective levels\nDate by which objective to be achieved\nBenzene: 16.25 micrograms per cubic metre or less, when expressed as a running annual mean\n31 December 2003\nBenzene: 5 micrograms per cubic metre or less, when expressed as an annual mean\n31 December 2010\n1, 3 -Butadiene: 2.25 micrograms per cubic metre or less, when expressed as a running annual mean\n31 December 2003\nCarbon monoxide: 10 milligrams per cubic metre or less, when expressed as a maximum daily running 8 hour mean\n31 December 2003\nNitrogen dioxide: 200 micrograms per cubic metre or less, when expressed as an hourly mean, not to be exceeded more than 18 times a year\n31 December 2005\nNitrogen dioxide: 40 micrograms per cubic metre or less, when expressed as an annual mean\n31 December 2005\nLead: 0.5 micrograms per cubic metre or less, when expressed as an annual mean\n31 December 2004\nLead: 0.25 micrograms per cubic metre or less, when expressed as an annual mean\n31 December 2008\nPM10: 50 micrograms per cubic metre or less, when expressed as a 24 hour mean, not to be exceeded more than 35 times a year\n31 December 2004\nPM10 40 micrograms per cubic metre or less, when expressed as an annual mean\n31 December 2004\nSulphur dioxide: 125 micrograms per cubic metre or less, when expressed as a 24 hour mean, not to be exceeded more than 3 times a year\n31 December 2004\nSulphur dioxide: 350 micrograms per cubic metre or less, when expressed as an hourly mean, not to be exceeded more than 24 times a year\n31 December 2004\nSulphur dioxide: 266 micrograms per cubic metre or less, when expressed as a 15 minute mean, not to be exceeded more than 35 times a year\n31 December 2005",
  "extent": "E+W",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Words in Sch. Pt. 1 Table inserted (31.12.2002) by The Air Quality (Amendment) (Wales) Regulations 2002 (S.I. 2002/3182), regs. 1(1), 2(2)(a)(i)"
    },
    {
      "type": "F",
      "label": "F2",
      "text": "Words in Sch. Pt. 1 Table inserted (31.12.2002) by The Air Quality (Amendment) (Wales) Regulations 2002 (S.I. 2002/3182), regs. 1(1), 2(2)(a)(ii)"
    },
    {
      "type": "F",
      "label": "F3",
      "text": "Word in Sch. Pt. 1 Table substituted (31.12.2002) by The Air Quality (Amendment) (Wales) Regulations 2002 (S.I. 2002/3182), regs. 1(1), 2(2)(b)"
    },
    {
      "type": "F",
      "label": "F4",
      "text": "Words in Sch. Pt. 1 Table inserted (31.12.2002) by The Air Quality (Amendment) (Wales) Regulations 2002 (S.I. 2002/3182), regs. 1(1), 2(2)(b)"
    },
    {
      "type": "I",
      "label": "I1",
      "text": "Sch. Pt. 1 in force at 1.8.2000, see reg. 1(1)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/wsi/2000/1940/schedule/part/I",
    "retrieved_at": "2026-10-29T00:18:33.450536+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."
}