Flyovers and landfill sites in the capital are responsible for high emission of poisonous methane gas according top a report on carbon emissions in the city.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/landfill-sites-high-emission-rate
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/green-house-gases
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/solid-waste
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/garbage
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/landfill
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi