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How Much Cancer Is Occupationally Derived

extent to which they are likely to be exposed to chemicals and dusts in manufacturing industries. Nowadays more people work in offices or at home, and the type of air pollution that they are exposed to, particularly while travelling to and from work in cities in this country, has changed from the heavily particulate sulphurous kind associated with the burning of soft coal to the high nitrogen dioxide, high carbon monoxide kind associated with traffic fumes. It is important, therefore, when addressing the question, ’How much cancer is occupationally derived?’ that one should resist the temptation to concentrate on just those materials and occupations in which cancer risks have been identified in the past. Instead, one needs to consider ’occupation’ in a far broader and more up-todate sense.