North India switched to Euro IV fuels from Wednesday.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/north-india-moves-euro-iv-fuel-industry-lags-behind
[2] http://admin.indiaenvironmentportal.org.in/category/author/jayashree-nandi
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/euro-iv
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-standards
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmentalists
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/sunita-narain
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-pollution-control-authority-epca
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution