Sharp jump in crop residue burning in Punjab, Haryana in last 10 days.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/nasa-photos-show-pollution-city-india-worsen-winter
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/asian-age-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/agriculture
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/crops
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/haryana
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/punjab
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb-0