A train moves forward through a thick blanket of fog into the damp gray air on a winter morning, in Jaipur. (Pics/PTI)

 People press on through the dense fog in a barely visible lane in Dehradun, Uttarakhand

A man, wrapped in a shawl, pedals through a foggy lane carrying vegetables in Dehradun

A railway trackman walks along the tracks carrying a hammer on a fog-shrouded winter morning on Monday in Rishikesh

A train crawls along the tracks under low visibility through dense winter fog at Namkom railway station in Ranchi