Environment ministry has written to all ministries and central government departments located in the national capital to hire only CNG-fuelled vehicles.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/government-departments-ministries-asked-hire-only-cng-vehicles
[2] http://admin.indiaenvironmentportal.org.in/category/author/dipak-k-dash
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-pollution-control-authority-epca
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/compensation
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution