The ministry of environment and forests has proposed to introduce a parallel public transport network, running on compressed natural gas (CNG), in Delhi. THis is to lower the use of petrol and diesel
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/ministry-recommends-cng-based-buses-delhi
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/business-standard-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution