Tannery source of income environmental pollution. Bangladesh, capital, city Dhaka: The leather industry is a major industry and source of income for people in the slum Islambag in the district of Lalbagh. This boy, looking up at a landfill for scraps of the leather factory. Child labor. The tannery, is also a huge polluter of the environment. The environmental pollution of the water of the Buriganga river is dramatic. In the background the shacks, built on stilts, from the slum and the buildings of the factory.