Metro to Be redesigned to control the pollution level in Delhi.
Links:
[1] http://admin.indiaenvironmentportal.org.in/content/delhi-faces-pollution-problem-because-metro
[2] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-and-health
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi-metro-rail-corporation-dmrc