Links:
[1] http://admin.indiaenvironmentportal.org.in/news/blacksmith-gets-vapi-list-most-polluted-cities
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-ahmedabad
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chemical-oxygen-demand-cod
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gujarat
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/common-effluent-treatment-plant-cetp