July and August had the least pollution thanks to the monsoon clearing up the dangerous fine particulate matter
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/city-woes-2-months-%E2%80%98good-air%E2%80%99-10-months-pollution
[2] http://admin.indiaenvironmentportal.org.in/category/author/bindu-shajan-perappadan
[3] http://admin.indiaenvironmentportal.org.in/category/author/damini-nath
[4] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-standards
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/centre-science-and-environment-cse
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/rainfall
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/monsoons
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects