New Delhi: The Commission for Air Quality Management (CAQM) lifted GRAP-IV with immediate effect in the Delhi-NCR region after the Air Quality Index crossed the 400-mark and made it into the ‘severe’ category on Saturday, January 17.

CAQM said Delhi’s Air Quality Index showed a sharp rise through the day, touching 400 by 4 pm and climbing to 428 by late evening. After which, the officials attributed the sudden deterioration to unfavourable weather conditions triggered by a western disturbance, coupled with poor wind movement that prevented pollutants from........

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