Amid the prevailing cold wave conditions?in the national capital region where the mercury is standing at seven?degrees Celsius,?Delhi on Wednesday morning woke up to a?thick blanket of fog that covered parts of Delhi-NCR and?caused visibility to drop to almost zero.?Besides Delhi-NCR, the entire?North India has been grappling with?a cold wave as temperatures continue to plummet in Uttar Pradesh, Bihar, Rajasthan, Uttarakhand, and Delhi-NCR.