IN PHOTOS: Heavy fog engulfs vast regions of India on frosty winter morning

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A commuter moves through dense fog in Ranchi. (Pic/PTI)

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

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

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

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

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