Delhi at Diwali is about as happy a city as any other metro - but it is also the noisiest and smokiest.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/diwali-smoke-and-noise-are-worst-ever-delhis-celebrations-break-records-pollution-hits-new-high
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/daily-mail-united-kingdom
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diwali
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cse
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/noise-pollution
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/festival
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-pollution-control-board-cpcb
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/bangalore-d
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/chennai-d
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kolkata
[14] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[15] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rspm-pm-10
[16] http://admin.indiaenvironmentportal.org.in/category/thesaurus/nitrogen-dioxide