Sulphur dioxide and other sulphur compounds

Oxides of nitrogen and other nitrogen compounds

Carbon monoxide

Volatile organic compounds

Metals and their compounds

Dust including fine particulate matter

Asbestos (suspended particulates, fibres)

Chlorine and its compounds

Fluorine and its compounds

Arsenic and its compounds

Cyanides

Substances and mixtures which have been proved to possess carcinogenic or mutagenic properties or properties which may affect reproduction via the air

Polychlorinated dibenzodioxins and polychlorinated dibenzofurans