The air quality was in the 'severe' range at Chandni Chowk; in the 'very poor' category at Delhi University, Pitampura, Indira Gandhi International (IGI) Airport and Noida.

New Delhi: The overall air quality in the national capital was again recorded in the 'very poor' category on Tuesday. The System of Air Quality and Weather Forecasting And Research (SAFAR) said that the air quality index (AQI) was recorded at 306 on Tuesday morning.

It is predicted that the AQI would continue to remain in the lower range of 'very poor' category for a couple of days after which it would improve to 'poor' range. SAFAR said that the foggy conditions due to radiation fog are persisting longer than expected. Also, wind speed has reduced which is working unfavourably for the dispersion of pollutants.

24 trains of Northern Railway running late due to fog. (File pic) pic.twitter.com/PWkHJSkUHl — ANI (@ANI) February 5, 2019

The overall PM2.5 (fine particulate matter in the air with a diameter of less than 2.5 micrometre) level in Delhi was recorded at 127 in the 'very poor' category while the PM10 (fine particulate matter in the air with a diameter of fewer than 10 micrometre) level was recorded at 221 in the 'moderate' category on Tuesday morning.

The air quality was in the 'severe' range at Chandni Chowk; in the 'very poor' category at Delhi University, Pitampura, Indira Gandhi International (IGI) Airport and Noida; in the 'poor' category at Gurugram and Mathura Road area; in the 'moderate' range at Lodhi Road.

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India Meteorological Department (IMD) said that the minimum temperature is likely to be nine degree Celsius while the maximum temperature would hover around 23 degree Celsius. IMD also predicted that the cloud would remain cloudy and light shower may occur. As many as 24 trains of Northern Railway were running late due to fog and low visibility, news agency ANI reported.