The govt. notified norms for sulphur dioxide and nitrogen dioxide emissions in December 2015, but these have not been implemented, says expert
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/thermal-power-plants-leading-spike-so2-no2-study
[2] http://admin.indiaenvironmentportal.org.in/category/author/damini-nath
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/thermal-power-plants
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nitrogen-dioxide
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/singrauli-stps
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/korba-stpp
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-standards