IMD has said that very dense fog observed early this morning in some parts of Uttar Pradesh where visibility was less than 50 metres. In Bareilly, Varanasi and Gorakhpur visibility was only 25 metres at 5.30 this morning. IMD said, Dense fog with visibility upto 50 to 200 metre were observed in isolated pockets of Rajasthan, Bihar, Haryana, Chandigarh, Madhya Pradesh and Odisha.