A vast majority of the world
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/who-examines-traffic-health-hazard
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/new-york-times-new-york
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/congestion
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/traffic-accidents
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tuberculosis
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/aids
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/economic-development
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/world-bank
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/developing-countries