The processing of 1,900 tonnes of urban waste every day which earns it crores of rupees and also fuels its buses has helped Indore bag India's cleanest city' award for the sixth straight time.

The results of the Union government's annual cleanliness survey were announced on Saturday. Indore was adjudged the cleanest city, followed by Surat and Navi Mumbai.

While segregation of garbage into dry and wet categories is common, in Indore segregation happens in six categories at a collection point.