{
  "url": "https://openlegislation.uk/control-of-major-accident-hazards-regulations-1999/schedule-1/part-2",
  "json_url": "https://openlegislation.uk/control-of-major-accident-hazards-regulations-1999/schedule-1/part-2.json",
  "legislation": "uksi/1999/743",
  "legislation_title": "The Control of Major Accident Hazards Regulations 1999",
  "legislation_url": "https://openlegislation.uk/control-of-major-accident-hazards-regulations-1999",
  "path": "schedule/1/part/2",
  "kind": "part",
  "number": "2",
  "heading": "Named Substances",
  "text": "Where a substance or group of substances listed in this Part also falls within a category of Part 3, the qualifying quantities set out in this Part must be used.\nColumn 1\nColumn 2\nColumn 3\nDangerous substances\nQuantity in tonnes\nAmmonium nitrate (as described in Note 1 of this Part)\n350\n2,500\nAmmonium nitrate (as described in Note 2 of this Part)\n1,250\n5,000\nArsenic pentoxide, arsenic (V) acid and/or salts\n1\n2\nArsenic trioxide, arsenious (III) acid and/or salts\n0.1\n0.1\nBromine\n20\n100\nChlorine\n10\n25\nNickel compounds in inhalable powder form (nickel monoxide, nickel dioxide, nickel sulphide, trinickel disulphide, dinickel trioxide)\n1\n1\nEthyleneimine\n10\n20\nFluorine\n10\n20\nFormaldehyde (concentration =>90%)\n5\n50\nHydrogen\n5\n50\nHydrogen chloride (liquefied gas)\n25\n250\nLead alkyls\n5\n50\nLiquefied extremely flammable gases (including LPG) and natural gas (whether liquefied or not)\n50\n200\nAcetylene\n5\n50\nEthylene oxide\n5\n50\nPropylene oxide\n5\n50\nMethanol\n500\n5,000\n4, 4-Methylenebis (2-chloraniline) and/or salts, in powder form\n0.01\n0.01\nMethylisocyanate\n0.15\n0.15\nOxygen\n200\n2,000\nToluene diisocyanate\n10\n100\nCarbonyl dichloride (phosgene)\n0.3\n0.75\nArsenic trihydride (arsine)\n0.2\n1\nPhosphorus trihydride (phosphine)\n0.2\n1\nSulphur dichloride\n1\n1\nSulphur trioxide\n15\n75\nPolychlorodibenzofurans and polychlorodibenzodioxins (including TCDD), calculated in TCDD equivalent\n0.001\n0.001\nThe following CARCINOGENS:\n4-Aminobiphenyl and/or its salts, Benzidine and/or salts, Bis(chloromethyl) ether, Chloromethyl methyl ether, Dimethylcarbamoyl chloride, Dimethylnitrosomine, Hexamethylphosphoric triamide, 2-Naphthylamine and/or salts, 1,3 Propanesultone and 4-nitrodiphenyl\n0.001\n0.001\nAutomotive petrol and other petroleum spirits\n5,000\n50,000",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [
    {
      "type": "words inserted",
      "affecting": "uksi/2014/162",
      "affecting_title": "The Heavy Fuel Oil (Amendment) Regulations 2014"
    },
    {
      "type": "substituted",
      "affecting": "uksi/2005/1088",
      "affecting_title": "The Control of Major Accident Hazards (Amendment) Regulations 2005"
    }
  ],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/uksi/1999/743/schedule/1/part/2",
    "retrieved_at": "2026-10-29T10:55:56.898069+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."
}