New Delhi, Dec. 21 -- Delhi residents woke up to a thick layer of toxic smog on Sunday morning. The India Meteorological Department (IMD) issued an orange alert for cold wave in Delhi-NCR, predicting significant drop in temperatures on 21 December. Warning against cold day conditions on Sunday, the weather agency said maximum temperatures in the national capital are expected to be markedly below normal by around 5 degrees Celsius.

"Partly cloudy sky. Cold day conditions at isolated places. Dense fog at a few places with very dense fog at isolated places during morning hours," IMD's press release states. The prevailing weather conditions indicate presence of subtropical westerly jet stream over North India, the Meteorological Department s...