Links:
[1] http://admin.indiaenvironmentportal.org.in/news/us-regulators-seek-more-input-truck-fuel-efficiency-rules
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/reuters
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/fuel-efficiency
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/heavy-duty-vehicle
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/trucks
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/united-states-america-us