The season’s first fog enveloped the national capital on Wednesday making visibility almost minimal, bringing the morning traffic to a sluggish pace.

The fog has also hit flights and trains with many of them having been cancelled or re-scheduled. Thirteen flights have been diverted so far from Delhi’s IGI airport. The Met has feared that fog is likely to spike the already high pollution levels in the national capital.

The minimum temperature in Delhi has fallen sharply to 9.7 degree Celsius. On Tuesday morning, the national capital recorded minimum temperature of 9.7°C, which is also the lowest temperature of the season so far.

Even the adjoining states of Punjab and Haryana witnessed moderate to dense fog. Road and rail services were also affected. Dense fog was also reported from several areas of the NH-1 between Ambala and Kundli border of Haryana and Delhi.

At least two persons were injured on Wednesday morning near Sonipat in a pile up of cars on a busy National Highway (NH-1).

The minimum temperature at most places in Haryana and Punjab hovered around 7-8 degrees Celsius.