# The Alkali, & c. Works Order (Northern Ireland) 1991, Schedule 1: List of Noxious or Offensive Gases in substitution for that contained in Section 27 of the Alkali Act


The expression “noxious or offensive gas”includes the following gases and fumes—
Acetic acid or its anhydride
Acetylene
Acrylates
Acrylic acid
Aldehydes
Amines
Ammonia or its compounds
Arsenic or its compounds
Bromine or its compounds
Carbon dioxide
Carbon disulphide
Carbon monoxide
Chlorine or its compounds
Cyanogen or its compounds
Di-isocyanates
Ethylene and higher olefines
Fluorine or its compounds
Fumaric acid
Fumes containing aluminium, antimony, arsenic, asbestos, beryllium, cadmium, calcium, chlorine, chromium, copper, gallium, glass fibres, iron, lead, magnesium manganese, mercury, mineral fibres, molybdenum, nickel, phosphorus, platinum, potassium, selenium, silicon, silver, sodium, sulphur, tellurium, thallium, tin, titanium, tungsten, uranium, vanadium, zinc or their compounds
Fumes from benzene works, paraffin oil works, petrochemical works, petroleum works, tar works or bitumen works
Hydrocarbons
Hydrogen sulphide
Iodine or its compounds
Isocyanates
Lead or its compounds
Maleic acid or its anhydride
Mercury or its compounds
Metal carbonyls
Muriatic acid (Hydrogen chloride)
Nitric acid or oxides of nitrogen
Nitriles
Phenols
Phosphorus or its compounds
Phthalic acid or its anhydride
Products containing hydrogen from the partial oxidation of hydrocarbons
Pyridine or its homologues
Styrene
Sulphuric acid or sulphur trioxide
Sulphurous acid or sulphur dioxide
Vinyl chloride
Volatile organic sulphur compounds.

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Source: https://www.legislation.gov.uk/nisr/1991/49/schedule/1 (the official version)
Page: https://openlegislation.uk/alkali-c-works-order-northern-ireland-1991/schedule-1
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.