Delhi has the dubious distinction of being ranked the most polluted city in the world by WHO. A random check of Delhiās pollution last week showed particulate matter (PM) 2.5 levels at 441 mcgm3.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/move-euro-5-make-diesel-cars-costlier
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-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/diesel
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cars
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kerosene
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/asthma
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects