London's Oxford Street has higher levels of Nitrogen Dioxide than anywhere in Europe and even Beijing
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/londons-dirty-secret-worse-air-beijing
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/telegraph-united-kingdom
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/china
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-kingdom-uk
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe