Links:
[1] http://admin.indiaenvironmentportal.org.in/news/decibel-level-takes-dip-year-pollution-board
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-mumbai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pune-t