Links:
[1] http://admin.indiaenvironmentportal.org.in/news/17-industries-spew-highly-toxic-gases
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-0
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-standards
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ministry-environment-and-forests-moef
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-pollution-control-board-cpcb