The draft report states two-wheelers are responsible for more PM 10 and PM 2.5 than cars when it comes to polluting the air.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/odd-even-policy-2-wheelers-among-most-polluting-says-iit-kanpur-draft-report
[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/two-wheelers
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-technology-iit
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/compensation
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heavy-duty-vehicle
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/public-transport