New Delhi, Nov. 21 -- Delhi's air quality improved slightly on Friday morning, with the overall Air Quality Index (AQI) at 370 at 8 am, according to data from the Central Pollution Control Board (CPCB).

The city had recorded an AQI of 391 at 4 pm on November 20. Despite the slight improvement, the city's air quality continued to remain in the ' very poor' category.

According to CPCB data, IGI Airport T3 recorded an AQI of 307, while ITO recorded 378. The Air Quality Index at Punjabi Bagh stood at 379.

Other areas, such as Najafgarh (350), North Campus DU (385), Aya Nagar (340), and CRRI Mathura Road (370), also continued to experience very poor air quality.

However, air quality in some parts of the National Capital was in the 'severe'...