The Indian Foundation of Transport Research and Training (IFTRT) has said that the Delhi Government's policy to give tax incentive to owners of diesel-run light goods vehicles (LGVs) if they bought CNG-run LGVs in order to make the Capital's air cleaner has failed to evoke any response from the truck operators concerned.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/move-replace-diesel-lgvs-cng-vehicles-fails
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/diesel
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/light-duty-vehicle
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi