During the week leading up to the Olympic Games, London experienced its worst ozone episode for six years.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/londons-ozone-level-cleared-just-olympic-start
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/guardian-uk
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-kingdom-uk
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/london
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/games
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/ozone
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/europe
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/who
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/france
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/belgium
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/netherlands