A severe cold wave is impacting North and Central India, with temperatures dropping significantly in Delhi-NCR, Punjab, Haryana, Rajasthan, and Uttar Pradesh. Ayanagar in Delhi recorded a low of 2.9 degrees Celsius, with some regions potentially reaching two degrees. The extreme cold poses health risks, including hypothermia and increased strain on the heart due to narrowed blood vessels and potential blood thickening, particularly affecting vulnerable populations.