The Bhubaneswar Municipal Corporation (BMC) seems to have paid hardly any attention to the Orissa State Pollution Control Board (OSPCB) guidelines on immersion of Ganesha idols.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/kuakhai-river-bears-brunt-ganesha-idol-immersion
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-bhubaneswar
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/orissa
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/religious-beliefs
[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/municipal-corporations
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/freshwater-ecosystems
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/festival