The humidity level was recorded at 86 per cent.
According to meteorological department, the city will witness clear sky, shallow fog in the morning, cold day to severe cold day conditions at many places.
The maximum temperature will hover around 15 degrees Celsius, the official said.
The air quality was recorded in the "very poor" category (365), primarily due to low wind speed, high humidity and cold weather on Friday morning.
With a numbing cold continuing to sweep Delhi-NCR, the region is expected to record its second-coldest December since 1901, the weather department said.
According to the IMD, a "cold day" is when the maximum temperature is at least 4.5 notches below normal. A "severe cold day" is when the maximum temperature is at least 6.5 degrees Celsius below normal.
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