With Delhi-NCR and adjoining areas of North India reeling from worsening air pollution, air purifier sales have surged as manufacturers and retailers report a spike in consumer enquiries and purchases, particularly after Diwali, even as companies see a gradual shift toward year-round adoption. Of the 59 monitoring stations reporting data, 17 recorded 'severe' air quality, 38 'very poor', three 'poor ', and one 'moderate' levels.