The massive rise in air pollution levels in 2011 was a major worry for the government.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/air-quality-dip-shifts-focus-pollution-monitoring
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/urban-air-quality
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cse
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environmentalists
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/congestion-pricing
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution