As many as 13 trains coming into Delhi were delayed on Saturday as dense fog blanketed the national capital and its neighbouring regions.With a cold wave gripping the region, a large number of people were seen taking refuge at night shelters in various parts of the national capital to shield themselves from chilly winds.The maximum temperature in the national capital is likely to be around 22 degrees Celsius, while the minimum may touch 9 degrees Celsius, according to the India Meteorological Department (IMD).The thick fog was coupled with poor air quality, with the overall Air Quality Index (AQI) of the national capital at 309 till 8.00 am, which falls in the 'very poor' category.According to data provided by the System of Air Quality and Weather Forecasting And Research (SAFAR), major pollutants PM 2.5 was at 131 and PM 10 was at 202, in 'very poor' and 'moderate' categories, respectively. In Lodhi Road area, PM 2.5 was at 234 while PM 10 was at 230, both of which fall in the 'poor'
