[reg. 3.]
Cyanogen and its compounds.
Fluorine and its compounds
Fumes and dust containing aluminium, antimony, arsenic,
beryllium, cadmium, copper, iron, lead, mercury, nickel, tin, vanadium, zinc or their compounds
Fumes or vapours from petrochemical works
Fumes or vapours from gas works
Fumes or vapours from tar and bitumen works
Hydrogen sulphide
Metal or metallic oxide fumes
Oxides and oxyacids of nitrogen
Hydrocarbons
Smoke, soot, grit and dust
Sulphur dioxide and sulphurous acid
Sulphur trioxide and sulphuric acid
Volatile organic sulphur compounds