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The smog in 1991, particularly notable in cities like New Delhi, was primarily caused by a combination of industrial emissions, vehicular pollution, and crop burning in surrounding agricultural areas. Weather conditions, such as temperature inversions, trapped pollutants close to the ground, exacerbating the situation. Additionally, rapid urbanization and inadequate regulatory measures contributed to the severity of the smog crisis. The combination of these factors led to significant air quality deterioration during that period.

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