This move makes New Delhi the first city in the country to switch from BS-IV grade fuels to BS-VI (equivalent to fuel meeting Euro-VI emission norms).
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/delhi-becomes-first-city-roll-out-euro-vi-fuel-what-does-mean
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-vi
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oxides-nitrogen-nox