Under the UPA government, a working group was formed to look into the revision of pollution categories
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/govt-pushes-ease-industrial-pollution-norms-and-inspections
[2] http://admin.indiaenvironmentportal.org.in/category/author/somesh-jha
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/regulations
[6] http://admin.indiaenvironmentportal.org.in/thesaurus/environment-clearance-ec
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/legislation
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ministry-environment-and-forests-moef