India, Dec. 21 -- Northern India has experienced a layer of fog every morning for the past few days, and the trend continued on Sunday, reducing visibility and hindering travel.

Travel through both air and rail was impacted by the fog, as over 200 flights have been delayed at the Delhi airport so far on Sunday, HT has learnt. Over 50 trains operated by Northern Railways have also been delayed due to adverse weather conditions and fog.

The Airports Authority of India (AAI) issued an advisory on Sunday, warning that fog conditions in parts of northern India are affecting visibility and may lead to delays or changes in flight operations at select airports.

"Fog conditions in parts of Northern India are affecting visibility and may lead to...