The Bharat Stage (BS) norms are equivalent to Euro norms on emission. The Ministry of Road Transport and Highways has issued a draft notification regarding introduction of BS-IV auto fuel norms in additional cities inviting suggestions and objections from citizens on the implementation.
Links:
[1] http://admin.indiaenvironmentportal.org.in/reports-documents/draft-notification-regarding-introduction-bs-iv-auto-fuel-norms-additional-cities
[2] http://admin.indiaenvironmentportal.org.in/category/publisher/ministry-road-transport-and-highways
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-iv
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicles
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-transport
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fuel-standards
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fuel-quality
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/india