There is possibility of light to moderate rain over the next three days and a decrease and increase in the maximum and minimum temperature, respectively.
The maximum temperature was expected to hover around 21 degrees Celsius, which is two notches below the normal. The humidity at 8.30 a.m. was recorded at 95 per cent, unfavourable for pollutants to disperse.
The Indian Railways said as many as 18 Delhi-bound trains were delayed due to fog.
Monday's maximum temperature was recorded at 22.3 degrees Celsius, a notch below the season's average and the minimum temperature was recorded at 7 degrees Celsius, three notches below the normal.
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