The ILO estimates that of the world’s 215 million child labourers, 115 million are involved in hazardous work, including 41 million girls and 74 million boys; 53 million are aged 5-14, and 62 million are aged 15-17. One concern is that the number of child labourers engaged in hazardous work has been increasing among the 15-17 age group. The highest concentration of hazardous child labour is in agriculture (59 %) followed by 30 % in services (e.g. domestic work, street-based work) and 11 % in industry (e.g. small workshops, mining, construction).