A new study by the Indian Institue of the Tropical Meteorology (IITM) Pune has revealed that the fog formation over the Indo-Gangetic plains of north India is determined by the abnormal air circulation patterns in Arctic and Eurasia.

Cold air coming from the Arctic and Eurasian regions over the Indo-Gangetic plains develops high pressure and further leads to fog formation in the presence of moisture near to the surface.

The fog around the Indo-Gangetic plains commonly develops because of the formation of a high-pressure environment over the Himalayan region.

The study which is based on the analysis of 105 cases of fog events from the period between 1979 and 2013 recorded the daily indicators of local weather phenomena like thunderstorms, fog and dust storms, humidity, winds, surface pressure, rainfall.