In the outskirts of Kolkata, India, fertilizer factories can be spotted on the roadside.

Scrap leather is placed by labourers in an oven to be burnt in order to recover a solid collagenic material containing high nitrogen levels, which can be employed for the production of nitrogenous fertilizer.

The burning of leather trimmings causes harmful smoke and it has a major negative impact on the health of the people working at the factories.

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