Major factors behind stubble burning include the paddy-wheat cropping system, cultivation of long-duration paddy varieties, mechanised harvesting that leaves standing crop stubble in the field, labour scarcity, and the lack of a viable market for crop residue.Studies estimate that during peak burning periods, farm fires contribute up to 30 per cent of PM levels in the Delhi-NCR region and surrounding areas.However, according to senior environmentalist Sunita Narain, the episodic burning of crop residue by farmers in winter is not the primary concern for poor air quality in Delhi-NCR. Instead, the persistent and major sources of pollution within the city, including transport and industries, are more worrisome.
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