Expert says that in most places it is equivalent to smoking 5-7 cigarettes
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/why-air-pollution-%E2%80%98national-health-emergency%E2%80%99
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-line-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/smoking
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/lung-cancer
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fossil-fuels
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects