IMD has issued dense to very dense fog warning for several states for next few days. It's very likely in some pockets of Punjab, Haryana, Chandigarh, Delhi and Uttar Pradesh over December 26-28 and over Rajasthan & north Madhya Pradesh on 26-27. Light to moderate rainfall has been predicted over Kerala, Tamil Nadu, Puducherry and Lakshadweep during next 5 days.