CHENNAI: Though the only study on monitoring of air quality in Chennai is two years old, it still holds good.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/city-needs-26-air-quality-monitoring-stations-study
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-chennai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-monitoring
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/indian-institute-technology-iit
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution-control