{
  "url": "https://openlegislation.uk/planning-hazardous-substances-regulations-2015/schedule-1/part-4/paragraph-21",
  "json_url": "https://openlegislation.uk/planning-hazardous-substances-regulations-2015/schedule-1/part-4/paragraph-21.json",
  "legislation": "uksi/2015/627",
  "legislation_title": "The Planning (Hazardous Substances) Regulations 2015",
  "legislation_url": "https://openlegislation.uk/planning-hazardous-substances-regulations-2015",
  "path": "schedule/1/part/4/paragraph/21",
  "kind": "paragraph",
  "number": "21",
  "heading": null,
  "text": "Polychlorodibenzofurans and polychlorodibenzodioxins\nThe quantities of polychlorodibenzofurans and polychlorodibenzodioxins are calculated using the following factors:\n1 Van den Berg et al: The 2005 World Health Organisation Re-evaluation of Human and Mammalian Toxic Equivalency Factors for Dioxins and Dioxin-like Compounds\nWHO 2005 TEF1\n2,3,7,8-TCDD\n1\n2,3,7,8-TCDF\n0.1\n1,2,3,7,8-PeCDD\n1\n2,3,4,7,8-PeCDF\n0.3\n1,2,3,7,8-PeCDF\n0.03\n1,2,3,4,7,8-HxCDD\n0.1\n1,2,3,6,7,8-HxCDD\n0.1\n1,2,3,4,7,8-HxCDF\n0.1\n1,2,3,7,8,9-HxCDD\n0.1\n1,2,3,7,8,9-HxCDF\n0.1\n1,2,3,6,7,8-HxCDF\n0.1\n1,2,3,4,6,7,8-HpCDD\n0.01\n2,3,4,6,7,8-HxCDF\n0.1\nOCDD\n0.0003\n1,2,3,4,6,7,8-HpCDF\n0.01\n1,2,3,4,7,8,9-HpCDF\n0.01\nOCDF\n0.0003\n(T = tetra, P = penta, Hx = hexa, Hp = hepta, O = octa)",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/2015/627/schedule/1/part/4/paragraph/21",
    "retrieved_at": "2026-10-28T23:43:23.974380+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."
}