Delhi appears to be more environment conscious than Mumbai and Pune as Delhiites largely would like the government to prioritize environmental protection over its development objectives.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/delhi-residents-favour-environment-over-development-survey
[2] http://admin.indiaenvironmentportal.org.in/category/author/vishwa-mohan
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/development
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/mumbai
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pune-t
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/birds
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/drinking-water
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waste-management
[12] http://admin.indiaenvironmentportal.org.in/category/thesaurus/waste-disposal
[13] http://admin.indiaenvironmentportal.org.in/category/thesaurus/electronic-waste