New Delhi, Jan. 13 -- Delhi woke up to a chilly morning on Tuesday as the temperature dropped to 4 degrees Celsius, with a cold wave and dense fog continuing to affect the national capital, while air quality remained a concern with the overall Air Quality Index recorded in the very poor category.

According to the Central Pollution Control Board (CPCB), Delhi's overall Air Quality Index (AQI) stood at 337, falling under the 'very poor' category as of 8 am today.

Several locations in the national capital continued to record AQI levels above 300. Nehru Nagar reported the pollution level at 358, Jahangirpuri at 357, Anand Vihar at 411 and RK Puram at 365. Patparganj recorded an AQI of 366, Wazirpur 375, Vivek Vihar 366, Siri Fort 342, Rohin...