Last year, the maximum cases of stubble burning recorded in a single day was 1,500 on May 9, 2018, across the state. This year, the maximum number of cases were recorded on May 12 at 1,291.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/punjab-stubble-burning-down-40-coming-weeks-be-challenge-pollution-board
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-new-delhi
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-pollution
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/crops
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/wheat
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/punjab
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/air-quality-index-aqi
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/state-pollution-control-board-spcb