Till now, pollution levels in residential areas of Delhi were known to be dangerously high. But a new methodology to calculate the pollution in air, water and land has detected some new villains.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/najafgarh-basin-delhis-most-polluted-area
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/water-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/industrial-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-pollution-control-board-cpcb
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/hazardous-waste
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noida
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ghaziabad-d