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The national capital on Sunday recorded a minimum temperature of 4.8 degrees Celsius, three notches below the season's average, according to the India Meteorological Department (IMD). It said the humidity level was recorded at 100 per cent at 8.30 am. The weather office predicted mainly clear skies and cold day conditions for the day. It had earlier said that the city might witness dense fog from January 22 to 27. According to the railways, 11 Delhi-bound trains were delayed by up to four hours due to foggy conditions. The Air Quality Index (AQI) was recorded at 358, which comes in the 'very poor' category, at 9 am, according to the Central Pollution Control Board (CPCB). An AQI between zero and 50 is considered "good", 51 and 100 "satisfactory", 101 and 200 "moderate", 201 and 300 "poor", 301 and 400 "very poor", and 401 and 500 "severe".
A blinding layer of fog affected road and rail traffic in the north and eastern parts of the country on Thursday, officials said. A spokesperson for the railways said that fog impacted the schedule of "24 trains approaching Delhi". The India Meteorological Department (IMD) reported very dense fog in isolated pockets of Punjab, west Uttar Pradesh, and Tripura; dense fog in parts of east Uttar Pradesh; Jammu, Haryana, Delhi, east Madhya Pradesh, Bihar, and Assam; and moderate fog in some pockets of north Rajasthan and west Madhya Pradesh. Visibility levels dropped to zero metres in Punjab's Bhatinda and Agra in Uttar Pradesh, 25 metres in Tripura's Agartala, and 50 metres in Jammu, Hisar in Haryana, Varanasi, and Lucknow in Uttar Pradesh, Sagar and Satna in Madhya Pradesh, Purnea in Bihar, and Assam's Tezpur. The Palam Observatory, near the Indira Gandhi International Airport, reported a visibility level of 100 metres at 5:30 am. However, it improved to 500 metres by 7 am due to surf