The national capital recorded a minimum temperature of 6.5 degrees Celsius, a notch below the normal, while the air quality was in the 'poor' category on Tuesday, officials said.
The maximum temperature was 18.3 degrees Celsius, two notches below the season's average, they said. Relative humidity at 5.30 pm was 78 per cent.
The India Meteorological Department (IMD) predicted foggy days through the week. "There will be dense fog on January 12 and 13. The maximum and minimum temperatures on Wednesday is expected to hover around 19 degrees Celsius and 8 degrees Celsius respectively," it said.