A number of flights and train services were affected yesterday as dense fog enveloped the national capital and reduced visibility to less than 50 metres in the morning.
A statement from the Northern Railway said 40 trains heading for Delhi were delayed.
Another 12 trains that were supposed to leave from here were also rescheduled, it added.
The authorities at Delhi’s Indira Gandhi International airport said six flights were diverted due to low visibility.
“Things improved by noon and now operations are normal,” the official said.
The visibility improved from 50 metres to 800-1,000 metres around noon as a south easterly wind picked up, an official of the meteorological department said.
Yesterday was the second day that north India has been fog-bound affecting normal life in the morning. The phenomenon, which spells the onset of winter in right earnest, shall prevail for the next few days, the Met office here said. 
Meanwhile, the air quality in the capital remained “severe” with high particle pollutant in air and thick fog continuing to choke residents.
As per weather analysts, high humidity, light winds and low temperatures are the reasons why the particulate matter was not getting dispersed and continues to be major cause of pollution.
“Right now the wind, which are coming from the Bay of Bengal have moisture in it and the pollutants are getting mixed with it. This situation could improve within two to three days, as north-westerly dry winds are expected after two days,” Mahesh Palawat, director of private weather forecasting agency Skymet, said.
According to Sumit Sharma, fellow at TERI, the levels of PM 2.5 (particulate matters with diameter less than 2.5 mm) are three to five times higher than prescribed standards.




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