While BS-IV contains 50 parts per million (ppm) sulphur, the BS-VI grade fuel only
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/sc-impact-auto-firms-shift-top-gear-rolling-out-bs-vi-vehicles
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bharat-stage-vi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicle-technology-and-fuel
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse