Chandigarh, Jan 05 (Agencies) : A thick blanket of fog enveloped most parts of Punjab, Haryana and their joint areas inclding capital Chandigarh on Wednesday morning throwing rail, road and air traffic services out of gear. As a result , road traffic was reduced to a snail's pace in most parts of the region.  Most trains from Chandigarh were also reported to be running behind schedule.
Overcast skies  and foggy weather have also affected flight operations at the Chandigarh airport.

"Most flights are delayed by one to two hours," an airport official said.
Cold wind swept across the region on Wednesday and kept the mercury below average.
Haryana's  Narnaul town was the coldest in the region where temperature went down to abysmal low of 2.7 degrees Celsius on Wednesday. Ambala town shivered at 5.3 degrees.
Hisar, Karnal and Bhiwani registered minimum temperatures of 5.5, 5 and 3.8 degrees respectively.
On Wednesday Chandigarh recorded a minimum temperature of 5 degrees nearly three notches below the Tuesday's mark.
"Due to fog, there was almost zero visibility in various cities of Punjab and Haryana.  Overcast conditions are also prevailing in most parts of region and we are expecting similar conditions to continue in the next couple of days," a weather department official said.
Amritsar was freezing at 3.2 degrees, while Patiala and Ludhiana cities recorded minimum temperatures of 3.8 and 4.6 degrees respectively.