Gurugram has the highest per capita car ownership, almost three times that of Delhi that was earlier regarded as the car capital of the country.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/three-things-gurugram-must-do-unclog-its-roads-and-make-its-air-breathable
[2] http://admin.indiaenvironmentportal.org.in/category/author/amit-bhatt
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-gurgaon
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/haryana
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gurgaon-t
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-pollution-control-board-cpcb
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution