A study by an NGO concluded that industrial pollution in the capital has increased due to flouting of norms by industrial units in Delhi.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/pollution-rise-norms-flouted
[2] http://admin.indiaenvironmentportal.org.in/category/author/nishtha-grover
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-waste
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/groundwater-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/toxic-wastes
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waste-recycling
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ngo
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hazardous-waste