The humidity at 8.30 a.m., was recorded at 82 per cent, while the air quality was "moderate" in the city.
According to the System of Air Quality and Weather Forecasting and Research (SAFAR), the overall quality index (AQI) of the national capital region was recorded at 118.
At least 20 Delhi-bound trains were delayed by two to six hours.
Friday's maximum temperature was recorded at 20.6 degrees Celsius, three notches below the season's average and the minimum temperature recorded at 7 degrees Celsius, two notches below the normal.
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