New Delhi, Nov. 12 -- Delhi's air quality improved marginally on Thursday morning, with the national capital recording an overall Air Quality Index (AQI) of 321 in the 'very poor' category. However, a thick layer of smog continued to engulf several parts of the city, reducing visibility during the early morning hours.

According to data recorded by the Central Pollution Control Board (CPCB) at 7 am, PM10 and PM2.5 remained the major pollutants across the national capital.

Among the monitoring stations, NSUT Jaffarpur recorded the highest AQI of 399, followed by Chandni Chowk at 387, Pusa (IITM) at 386, NSIT Dwarka at 383 and JNU at 378. Punjabi Bagh recorded an AQI of 371, while CRRI Mathura Road registered 365.

Chhawla recorded an AQI ...