The bans, however, do not feature as a recommendation by an expert committees that had been formed to look into the question of dealing with air pollution.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/air-pollution-ngt-bans-hot-mix-plants-road-work-kolkata-howrah
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/west-bengal
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/national-green-trbunal-ngt
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/high-court
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/kolkata