Amid high pollution levels in the national capital Delhi, a meeting chaired by the Union Cabinet Secretary and senior officers of Punjab, Haryana, Uttar Pradesh, Rajasthan and Delhi on November 8, observed that stubble burning in Punjab is the major reason behind air pollution in Delhi-NCR during the paddy harvesting season. A total of 22,644 stubble burning incidents have been recorded between September 15 and November 7 and Punjab accounted for 93 per cent of these farm fires, the Central government said.