New Delhi, Dec. 22 -- Several states and cities in the northern part of India were engulfed in dense fog. Delhi/NCR, Uttar Pradesh, Varanasi, and Jaipur woke up to reduced visibility and intense cold.

Delhi chokes with toxic smog

Delhi experienced a hard time with low visibility as toxic smog persisted over the city-state early morning on Monday. Visuals from the Indira Gandhi International Airport showed severely low visibility, which might disrupt the flight schedule for passengers.

Meanwhile, the AQI (Air Quality Index) around the NH 24 was recorded at 363 according to CPCB (Central Pollution Control Board), which placed it in the "very poor" category.

GRAP 4 was invoked in the national capital to curb the extreme air pollution.

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