Every winter, the thick fog that blankets northern India and throws in to a Estate of disarry, is due to the western disturbances and pollutions from multiple sources. Study by a team of scientists at the western disturbances and pollutants from multiple sources study by a team of scientists at the Indian institute of Tropical Methodology (IITM), Pune, has revealed this feature is prevalent in the entire Indo-Ganget plan, from parts of Pakistan up to West Bengal.

The study, which was published by PD Safai at the Journal of Atmospheric Chemistry,Spriger Publishers,UK on June 25,been co-authored by S kewat,G Pandhithurai,P S Praveen,Kaushar Ali,S Tiwari,P S Rao,K B Budhawant ,S K Shah and P C Devara. According to safai,"We have studied the fog water and aerosols (dust particles suspended in the atmosphere) Chemistry.