Discharge from slaughterhouses; sugar, paper and chemical units making Hindon, Kali dirty.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/hindon-water-unfit-even-bathing-says-pollution-board
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/uttar-pradesh
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hindon
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sugar-industry
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/paper-and-pulp-industry
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chemical-industry
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-pollution-control-board-cpcb