A cold wave has been predicted to last till Saturday.
Temperatures across northwest India has been reeling under similar low temperature, an India Meteorological Department official told IANS. Punjab, Haryana and Rajasthan were also experiencing biting cold.
The humidity at 8.30 a.m. was 89 per cent -- a condition not favourable for dispersal of pollutants.
Thursday's maximum temperature was 22 degrees Celsius, normal for this time of the year, while the minimum was 4 degrees Celsius, four notches below the season's average.