Key exposures include: � Carbon monoxide � Coal dust � Coal tar pitch volatiles / polycyclic aromatic hydrocarbons � Diesel particulate as elemental carbon � Fluorides � Lead, as inorganic dusts and fumes � Manganese as dusts, compounds as manganese and fume � Nickel (all species) � Silica (crystalline as quartz and cristobalite) � Sulphuric acid.