Over 40,000 local goods vehicles—below 3.5 tonnes in weight—operate in the NCR area. These don’t need permits, only registration.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/trucks-loaded-brim-choke-capital
[2] http://admin.indiaenvironmentportal.org.in/category/author/rumu-banerjee
[3] http://admin.indiaenvironmentportal.org.in/category/newspaper/times-india-new-delhi
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/delhi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicles
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/environment-pollution-control-authority-epca
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cng
[10] http://admin.indiaenvironmentportal.org.in/category/thesaurus/central-road-research-institute-crri
[11] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects