{
  "url": "https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991/schedule-4",
  "json_url": "https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991/schedule-4.json",
  "legislation": "uksi/1991/472",
  "legislation_title": "The Environmental Protection (Prescribed Processes and Substances) Regulations 1991",
  "legislation_url": "https://openlegislation.uk/environmental-protection-prescribed-processes-and-substances-regulations-1991",
  "path": "schedule/4",
  "kind": "schedule",
  "number": "4",
  "heading": "RELEASE INTO THE AIR: PRESCRIBED SUBSTANCES",
  "text": "Oxides of sulphur and other sulphur compounds\nOxides of nitrogen and other nitrogen compounds\nOxides of carbon\nOrganic compounds and partial oxidation products\nMetals, metalloids and their compounds\nAsbestos (suspended particulate matter and fibres), glass fibres and mineral fibres\nHalogens and their compounds\nPhosphorus and its compounds\nParticulate matter.",
  "extent": "E+W+S",
  "status": null,
  "version": "current",
  "annotations": [
    {
      "type": "F",
      "label": "F1",
      "text": "Regulations revoked (E.W.) (6.4.2008) by The Environmental Permitting (England and Wales) Regulations 2007 (S.I. 2007/3538), reg. 1(1)(b), Sch. 22 (with regs. 69-72); and lapsed (S.) by virtue of repeal of power conferring provision 1990 c. 43, s. 2 (S.) (1.4.2015) by Pollution Prevention and Control Act 1999 (c. 24), s. 7(3), Sch. 3 (with s. 7(7)); S.S.I. 2015/74, art. 2(2)(b)"
    },
    {
      "type": "I",
      "label": "I1",
      "text": "Sch. 4 in force at 1.4.1991 for E.W. and 1.4.1992 for S., see reg. 1(2)"
    }
  ],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1991/472/schedule/4",
    "retrieved_at": "2026-10-29T14:49:53.509555+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."
}