Directly aping Euro norms might be a problem considering the driving conditions peculiar to India that might require the adaptation of critical components to work in these conditions.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/emission-norms-vrooming-bharat-vi-not-option
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-iv
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/oxides-nitrogen-nox
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ministry-shipping-road-transport-and-highways
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/auto-technology
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicle-technology-and-fuel