Links:
[1] http://admin.indiaenvironmentportal.org.in/news/no-record-aqi-punjab-villages
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/tribune-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/punjab
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution