Links:
[1] http://admin.indiaenvironmentportal.org.in/news/pollution-board-chalk-out-action-plan-clean-periyar
[2] http://admin.indiaenvironmentportal.org.in/category/author/ks-sudhi
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-thiruvananthapuram
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kerala
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/periyar
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/river-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution