On December 11, 2015 the tribunal had banned registration of new diesel-run vehicles in Delhi-NCR noting that diesel was the prime source of pollution.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ban-diesel-cars-corporate-death-penalty-toyota-tells-ngt
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cars
[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/toyota-motor
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-green-trbunal-ngt
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-technology-iit
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicle-technology-and-fuel
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/auto-industry