The India Meteorological Department (IMD) has issued dense to very dense fog warning for several states/UTs for Friday. It is very likely over Uttar Pradesh, Bihar, Punjab, Haryana, Chandigarh, Uttarakhand, Arunachal Pradesh, Assam, Meghalaya, Himachal Pradesh, Jharkhand, Nagaland, Manipur, Mizoram and Tripura.