The NGT Friday had issued an interim ban on registration of all diesel-based vehicles in Delhi till January 6, after noting that vehicular pollution was one of the major causes of air pollution.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ban-registration-diesel-vehicles-ngt-hear-plea
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicles
[7] http://admin.indiaenvironmentportal.org.in/thesaurus/national-green-tribunal-ngt
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-iv
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control