Hundreds of vehicles caught for several minutes in every signal and traffic bottleneck pollute the air by spewing smoke.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/better-traffic-management-will-reduce-pollution-experts
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-coimbatore
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/transport
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mobility-planning
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/two-wheelers
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmentalists