It is alleged that procedures to determine pollution level are hardly followed by the authorities concerned
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/polluting-buses-leave-road-users-fuming
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/hindu-madurai
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/tamil-nadu
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/madurai-t
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/vehicular-pollution
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/buses
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/pm-25
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/motor-vehicle-act-1988
[9] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution